C++ while problem

I have a problem with while loop in c++. I write this code:

#include <iostream.h>
main () {
    int a, av = 0;
    cout << "Enter a number: ";
    cin >> a;

        for (int i = 1; i <= a; i++) {
            while (av == 1) {
                cout << "abc" << a / i;
                if (a % i == 0) {
                    av = 1;
          开发者_如何学C      }
            }
        }
}

This program should print "abc", but it doesn't print any thing. I know the problem is in while section, but how can I fix it? Thanks ..

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It should be while (av == 0) to get in the inner loop.

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av is 0 when you get to the while loop so the condition av==1 is always false.

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At the beginning, av is equal to 0. Its value never gets changed, because the while loop is never entered (since av is NOT equal to 1).

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You never initialize av to 1. Try changing your first statement to:

int a, av = 1;

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Well the while loop will never be entered since av = 0 and the loop predicate is av == 1.

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Two cases when abc would not be printed:

1 : The user enters 0 as the input for 'a' - The for loop is exited in the first loop itself as i would never be 0.

2 : initial value of av is 0 and and while (av==1) would never be true irrespective of the number of times the 'for' loop is run

to print abc:

Set av == 1 initially or make sure user enter a number > 0 always

OR

change the code as follows: while (av == 1) { cout << "abc" << a / i; } if (a % i == 0) av = 1;