C++ for Python Programmers The PreTeXt Edition

Even though the while type of construct is very useful in a wide variety of situations, another iterative structure, the for statement, can be used to iterate across a range of values easily. A for statement allows us to write a loop that is executed a specific number of times.

In the example above, the hello world statement is executed 10 times.

A common use of the for construct is to implement certain repetition over a range of values.

The code will use cout five times. The value of the variable i will start at 0 and go through the full sequence of values 0,1,2,3,4. This value is then squared and printed.

#include <iostream>
using namespace std;

int main() {

    for (int counter=0; counter<4; counter++) {
        cout << counter * 2 << " ";
    }

    return 0;
}