Question

COSC-1315 2807 12B Introduction to Computer Programming

For this discussion, you saw in the chapter that the while loop is a pretest loop. What is a post test loop and what example can you come up with? Lastly, what explanation can you find as to why Python does not have a post test loop?

Answer 1

(1.)

Post Test loop, where the condition comes after the body. Using a while loop first checks the statement within the loop and then goes to check the condition to determine if the statement will run again or not.

Example: using c++

#include <iostream>

using namespace std;

int main()
{
    int i = 0;
    do {
        cout << i << endl;
        i++;
    } while(i<5);

    return 0;
}

(2.)

In Python, there is no structure made for do-while loop or post test loop, because if the post-test loop, it will give you value like an infinite loop and will never close the loop. That's why we use break to stop the while post-test loop.

Basically there is no logic built for post test loop.

In Python, we use while loop like this

i = 0

while True:
    print(i)
    
    if i >= 5:
        break
    i = i+1

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