If you're new to programming, this tutorial will show you how to program from scratch using c++ programming language using a simple example with comprehensive explanations.
Note:
- Any line that starts with /* and ends with */ are comments, it doesn't make any changes to your code. Allows the programmer to add a description about the code. It's also called multiline comment.
- Anything after double forward slash or // to the end of the line is also considered to be a single line comment of the code.
Line 6 defines the scope of the identifiers used in the program.
The iostream header file should be included at the beginning of all programs that use input/output statements.
This code contains only one function, main ().
Every c++ program must have main() function.
As usual, execution begins at main() function.
The statement on line 8 causes the string in quotation marks to be displayed on the screen.
In c++, every main function should end with a return(0) statement, otherwise a warning or an error can occur.
Reading-user-input.cpp
60F7Now we've got four statements within the main function, these are:
- Line 4 is used to declare a variable with an integer data type,
- Line 5 to give instructions to the user,
- Line 6 to read input from the user and
- Line 7 to display the user input back to the screen.
- Line 4 and 5 are used to declear and intialize the variable
- Line 6 checks for the condition if the expression given to if statmenet is true, then the if block will be executed,
- Otherwise the else block will be executed
- Note: else part doesn't take any condition expression like the 'if'