c++ while loop decrement

To explain the steps of a while loop in C++ with decrement, here is a breakdown:

  1. Initialization: Start by initializing a variable with an initial value. This variable will be used to control the loop. For example, int i = 10; initializes the variable i with a value of 10.

  2. Condition: Next, specify a condition that must be true for the loop to continue executing. This condition is checked before each iteration of the loop. For example, while (i > 0) checks if the value of i is greater than 0.

  3. Loop Body: If the condition is true, the code inside the loop body will be executed. This is the block of code enclosed within curly braces {} following the while statement. For example, cout << i << endl; prints the value of i to the console.

  4. Decrement: At the end of each iteration, the loop variable is decremented to move closer to the termination condition. In this case, i-- subtracts 1 from the value of i. It could also be written as i = i - 1 or i -= 1.

  5. Termination: If the condition in step 2 is false, the loop terminates, and the program continues with the next line of code after the loop. In this example, when i becomes 0, the condition i > 0 becomes false, and the loop stops executing.

Here's an example that combines all these steps:

#include <iostream>

int main() {
    int i = 10;

    while (i > 0) {
        std::cout << i << std::endl;
        i--;
    }

    return 0;
}

This code will print the numbers from 10 to 1, each on a new line. The loop will terminate when i becomes 0.