8000 Added code and CMake file for fourth session · estimand/intro-to-cpp@094fb45 · GitHub
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gcampanellagcampanella
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Added code and CMake file for fourth session
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‎04_cpp_fundamentals_2/code/01_file_io.cpp

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#include <fstream>
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#include <iostream>
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using namespace std;
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int main()
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{
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ifstream input("01_input.txt"); // Default mode: ios::in
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if (!input) {
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cerr << "Unable to open input file" << endl;
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return 1;
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}
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ofstream output("01_output.txt"); // Default mode: ios::out | ios::trunc
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int n;
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while (input >> n)
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{
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output << n * n << endl;
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}
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input.close();
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output.close();
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return 0;
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}
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‎04_cpp_fundamentals_2/code/01_input.txt

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0
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1
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2
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‎04_cpp_fundamentals_2/code/01_output.txt

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0
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9
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‎04_cpp_fundamentals_2/code/02_strings.cpp

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#include <iostream>
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#include <string>
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using namespace std;
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int main()
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{
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string s("Test");
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cout << "The string \"" << s << "\" has length " << s.length() << endl;
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// Alternatively:
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cout << s.size() << endl;
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s += " and more test";
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cout << "The string \"" << s << "\" has length " << s.length() << endl;
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return 0;
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}
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‎04_cpp_fundamentals_2/code/03_word_guess.cpp

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#include <iostream>
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#include <random>
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#include <string>
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using namespace std;
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const int N_WORDS = 15;
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const string WORDS[N_WORDS] = {
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"black", "blue", "brown", "cyan", "gray", "green", "indigo", "magenta",
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"orange", "pink", "purple", "red", "violet", "white", "yellow"
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};
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int main()
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{
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random_device rd;
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mt19937 prng(rd());
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uniform_int_distribution<> uniform(0, N_WORDS - 1);
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string target = WORDS[uniform(prng)];
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string guess(target.length(), '*');
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string used;
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int n = 0;
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char letter;
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while (guess != target)
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{
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cout << "Your current guess: " << guess << endl;
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cout << "Letter? ";
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cin >> letter;
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if (used.find(letter) != string::npos ||
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guess.find(letter) != string::npos)
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{
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cout << "You already used this letter. Try again!" << endl;
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continue;
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}
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n++;
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if (target.find(letter) == string::npos)
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{
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cout << "Sorry, this letter doesn't appear in the word." << endl;
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used += letter;
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}
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else
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{
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cout << "Good guess!" << endl;
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int position = -1;
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while (true)
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{
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position = target.find(letter, position + 1);
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if (position == string::npos) {
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break;
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}
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guess[position] = letter;
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}
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}
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}
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cout << "You got it! "
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<< "The word was \"" << target << "\". "
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<< "It took you " << n << " guesses." << endl;
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return 0;
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}
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‎04_cpp_fundamentals_2/code/04_vectors.cpp

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#include <iostream>
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#include <vector>
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using namespace std;
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void print(const vector<int> & v)
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{
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cout << "Elements: ";
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for (int i = 0; i < v.size(); i++)
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{
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cout << v[i] << " "; // [] doesn't check bounds
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}
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cout << endl;
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}
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int main()
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{
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vector<int> v(10);
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print(v);
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cout << "Size: " << v.size() << endl;
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cout << "Capacity: " << v.capacity() << endl;
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for (int i = 0; i < v.size(); i++)
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{
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v.at(i) = i * i; // .at() checks bounds
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}
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print(v);
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cout << "First: " << v.front() << endl;
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cout << "Last: " << v.back() << endl;
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for (int i = v.size(); i < 20; i++)
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{
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v.push_back(i * i); // Append element at the end
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}
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print(v);
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cout << "Size: " << v.size() << endl;
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cout << "Capacity: " << v.capacity() << endl;
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v.pop_back(); // Remove the last element
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print(v);
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cout << "Size: " << v.size() << endl;
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cout << "Capacity: " << v.capacity() << endl;
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v.clear(); // Remove all elements
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print(v);
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cout << "Size: " << v.size() << endl;
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cout << "Capacity: " << v.capacity() << endl;
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return 0;
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}
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‎04_cpp_fundamentals_2/code/CMakeLists.txt

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set(CMAKE_CXX_STANDARD 14)
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add_executable(01_file_io 01_file_io.cpp)
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add_executable(02_strings 02_strings.cpp)
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add_executable(03_word_guess 03_word_guess.cpp)
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add_executable(04_vectors 04_vectors.cpp)
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