int main(void)
{
double change;
int x = 0;

// loops everytime user inputs invalid #//

do
{
  printf("How much change is owed? n");
  change = get_float();
}
while(change < 0);


//declaring i for change in int, rounds to int from float//
int i = roundf(change * 100);


while (i >= 25){
x++;
i -= 25;
}

while (i >= 10){
x++;
i -= 10;
}

while(i >= 5){
x++;
i -= 5;
}

while(i >= 1){
x++;
i -= 1;
}

//prints x; total amt of coins used//
printf("%xn", x);

return 0;

printf("%xn", x);

printf("%dn", x);