óia esse

#include <stdio.h>

int counter(int numbers, int *num)
{
    int counting = 0;
    while(*num >= numbers)
    {
        *num = *num - numbers;
        counting++;
    }
    return counting;
}

int main()
{
    int num;
    scanf("%d", &num);

    printf("%d\n", num);
    printf("%d nota(s) de R$ 100,00\n", counter(100, &num));
    printf("%d nota(s) de R$ 50,00\n",  counter(50, &num));
    printf("%d nota(s) de R$ 20,00\n",  counter(20, &num));
    printf("%d nota(s) de R$ 10,00\n",  counter(10, &num));
    printf("%d nota(s) de R$ 5,00\n",   counter(5, &num));
    printf("%d nota(s) de R$ 2,00\n",   counter(2, &num));
    printf("%d nota(s) de R$ 1,00\n",   counter(1, &num));

    return 0;
}