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‎Basic-Programs/AdamNum.java

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/*
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* lets num=12;
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* now, square of 12=144
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* reverse of 12 = 21
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* square of 21= 441
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* 144=rev(441)
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*
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* So, the number 12 is a adam number
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*
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* */
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import java.util.Scanner;
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public class AdamNum {
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static int revDigit(int num) {
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int rev = 0;
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while (num > 0) {
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rev = rev * 10 + num % 10;
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num /= 10;
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}
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return rev;
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}
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static int square(int n) {
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return n * n;
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}
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static boolean checkAdam(int num) {
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int a = square(num);
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System.out.println("Number square: " + a);
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int b = square(revDigit(num));
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System.out.println("Reverse Number Square: " + b);
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return (a == revDigit(b));
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}
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the Number: ");
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int n = sc.nextInt();
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if (checkAdam(n)) {
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System.out.println("Adam Number! ");
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} else {
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System.out.println("Not a Adam Number! ");
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}
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sc.close();
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}
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}

‎Basic-Programs/Armstrong.java

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import java.util.Scanner;
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/**
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*
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* @author Vidhikara
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*/
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public class Armstrong {
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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System.out.println("Enter the no. - ");
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long n=in.nextInt();
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long sum=0,res,temp=n;
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while(n>0){
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res=n%10;
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sum=sum+(res*res*res);
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n=n/10;
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}
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if(temp==sum){
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System.out.println("Armstrong");
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}else{
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System.out.println("Not Armstrong");
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}
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in.close();
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}
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}

‎Basic-Programs/BinaryToDec.java

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import java.util.Scanner;
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/**
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*
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* @author Vidhikara
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*/
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public class BinaryToDec {
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter the binary no. - ");
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String bin=sc.nextLine();
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int flag=1;
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long dec=0,num;
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for(int i=0;i<bin.length();i++){
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if(bin.charAt(i)=='1'|| bin.charAt(i)=='0')
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flag=1;
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else
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flag=0;
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}
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if(flag==0){
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System.out.println("Not a valid Binary Number!!!!");
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}else{
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num=Long.parseLong(bin);
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for(int i=0;i<bin.length();i++){
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dec+=((num%10)*Math.pow(2, i));
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num=num/10;
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}
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System.out.println("Decimal Number is : "+(int)dec);
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}
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sc.close();
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}
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}

‎Basic-Programs/BitwiseDecToBin.java

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import java.util.Scanner;
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public class BitwiseDecToBin {
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public static void main(String[] args) {
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int number;
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Scanner in = new Scanner(System.in);
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System.out.println("Enter a positive integer");
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number = in.nextInt();
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if (number < 0) {
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System.out.println("Error: Not a positive integer");
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} else {
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System.out.print("Convert to binary is:");
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//System.out.print(binaryform(number));
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printBinaryform(number);
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}
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in.close();
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}
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private static void printBinaryform(int number) {
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int remainder;
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if (number <= 1) {
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System.out.println(number);
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return; // KICK OUT OF THE RECURSION
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}
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remainder = number %2;
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printBinaryform(number >> 1);
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System.out.print(remainder);
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}
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}

‎Basic-Programs/DecToBin.java

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import java.util.Scanner;
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public class DecToBin {
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public static String toBinary(int n) {
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if (n == 0) {
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return "0";
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}
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String binary = "";
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while (n > 0) {
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int rem = n % 2;
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binary = rem + binary;
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n = n / 2;
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}
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return binary;
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}
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.print("Enter a number: ");
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int decimal = sc.nextInt();
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String binary = DecToBin.toBinary(decimal);
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System.out.println("The binary representation is " + binary);
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sc.close();
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}
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}

‎Basic-Programs/DecToHex.java

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import java.util.Scanner;
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class DecToHex
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{
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public static void main(String args[])
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{
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Scanner input = new Scanner( System.in );
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System.out.print("Enter a decimal number : ");
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int num =input.nextInt();
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int rem;
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String str2="";
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char hex[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
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while(num>0){
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rem=num%16;
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str2=hex[rem]+str2;
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num=num/16;
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}
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System.out.println("Decimal to hexadecimal: "+str2);
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input.close();
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}
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}

‎Basic-Programs/DecToHexm2.java

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< 10000 td data-grid-cell-id="diff-cf6972bcbef4a16196c356b0e00faaa202cf7994975a303a7b0b513ddd9178c9-empty-29-2" data-line-anchor="diff-cf6972bcbef4a16196c356b0e00faaa202cf7994975a303a7b0b513ddd9178c9R29" data-selected="false" role="gridcell" style="background-color:var(--diffBlob-additionLine-bgColor, var(--diffBlob-addition-bgColor-line));padding-right:24px" tabindex="-1" valign="top" class="focusable-grid-cell diff-text-cell right-side-diff-cell left-side">+
int dec=0;
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import java.util.Scanner;
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class DecToHexm2
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{
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public static void main(String args[])
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{
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Scanner input = new Scanner( System.in );
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System.out.print("Enter a decimal number : ");
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int num =input.nextInt();
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int rem,base=16;
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String digits="0123456789ABCDEF";
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String hex="";
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while(num>0){
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rem=num%base;
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hex=digits.charAt(rem)+hex;
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num=num/base;
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}
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System.out.println("Decimal to hexadecimal: "+hex);
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System.out.println("---------------------------------");
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System.out.print("Enter a HEX number : ");
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String hexa=input.next();
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System.out.println("Decimal Number of '"+hexa+"' is : "+hex2Dec(hexa));
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System.out.println("---------------------------------");
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input.close();
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}
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public static int hex2Dec(String s){
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String digits="0123456789ABCDEF";
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s=s.toUpperCase();
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for(int i=0;i<s.length();i++){
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char c=s.charAt(i);
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int d=digits.indexOf(c);
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dec=16*dec+d;
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}
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return dec;
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}
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}

‎Basic-Programs/LeapYear.java

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import java.util.Scanner;
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public class LeapYear {
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter the year: ");
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int year=sc.nextInt();
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if((year%400==0)||((year%4==0)&&(year%100)!=0))
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System.out.println("Leap Year!");
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else
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System.out.println("Non-Leap Year!");
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sc.close();
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}
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}

‎Basic-Programs/Perfect.java

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import java.util.Scanner;
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/*
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perfect Number between 1-N
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*/
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public class Perfect {
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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System.out.println("Enter the no. - ");
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long n=in.nextInt();
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int i;
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for(i = 2; i < n; i++) {
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if(isNumPerfect(i)) {
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System.out.println(i + " is a perfect number");
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}
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}
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in.close();
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}
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public static boolean isNumPerfect(int i) {
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boolean isPerfect = false;
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int sum = 1;
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int x;
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for(x = 2; x <= i / 2; x++) {
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if(i % x == 0) {
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sum += x;
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}
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}
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if(sum == i) {
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isPerfect = true;
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}
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return isPerfect;
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}
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}

‎Basic-Programs/SwapTrick.java

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import java.util.Scanner;
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class SwapTrick
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{
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public static void main(String args[])
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{
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int x, y;
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System.out.println("Enter 1st and 2nd");
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Scanner in = new Scanner(System.in);
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x = in.nextInt();
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y = in.nextInt();
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System.out.println("Before Swapping\n first No. = "+x+"\n 2nd No. = "+y);
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y=x+y-(x=y); // check this
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System.out.println("After Swapping\n first No. = "+x+"\n 2nd No. = "+y);
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in.close();
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}
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}

‎Basic-Programs/checkPrime.java

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import java.util.Scanner;
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/**
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*
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* @author Vidhikara
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*/
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public class checkPrime {
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public static void main(String[] args) {
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Scanner scn=new Scanner(System.in);
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int n=scn.nextInt();
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if(n<2){
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System.out.println("Not a prime!! ");
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scn.close();
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return;
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}
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for(int i=2;i<=n/2;i++){
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if(n%i==0){
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System.out.println("Not a prime!! ");
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scn.close();
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return;
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}
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}
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System.out.println("Number is Prime!! ");
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scn.close();
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}
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}

‎Basic-Programs/conTrick.java

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import java.util.Scanner;
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class conTrick{
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public static void main(String args[]){
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Scanner input = new Scanner( System.in );
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System.out.print("Enter a decimal number : ");
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int num =input.nextInt();
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System.out.println("Decimal to binary: \t"+Integer.toBinaryString(num));
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System.out.println("Decimal to Hexadecimal: "+Integer.toHexString(num));
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System.out.println("Decimal to octal: \t "+Integer.toOctalString(num));
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input.close();
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}
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}

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