While(), Example

int x;

x = 0;

while ( x != 2)

x = x + 1;

printf("x = %d.\n", x);

The statement

x = 0;

sets x to 0. Since 0 is not equal to 2, x != 2 evaluates to true;

x = x + 1;

is executed, making x equal 1. We return to the top of while condition. x now is 1 not equal to 2. So x is increased to 2. Now x != 2 is false. The loop terminates. The printf prints out

x = 2.

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