working

#include <stdio.h>
#include <cs50.h>
#include <math.h>

int main(void)
{
    float owed;
    int cents;
    do
    {
        printf("How much is owed?\n");
        printf("$");
        owed = GetFloat();
    }
    while(owed < 0);

    cents = (int) round(owed * 100);
    printf("%i\n", cents);
}