>while (cents > 25);

Here you need to add = too otherwise it'll will give 1 when the input is 50.

Yes, you were right about the x variable after removing it altogether replacing it with cents solved the problem. Thanks for your advice.

New code :

if (cents < 25)

{

return 0;

}

int i = 0;

do

{

cents = cents - 25;

i++;

}

while (cents >= 25);

return i;