text: #include <cs50.h>
  #include <stdio.h>
  #include <math.h>
  int main(void)
  {
      int n, count=0;
      float cash;
      do
      {
          cash = get_float("Change owed: ");
      }
      while (cash<=0);
      n = round(0.41 * 100);
      while (n>0)
      {
          if (n>=25)
          {
              n-=25;
              count+=1;
          }
          else if (n>=10)
          {
              n-=10;
              count+=1;
          }
          else if (n>=5)
          {
              n-=5;
              count+=1;
          }
          else if (n>=1)
          {
              n-=1;
              count+=1;
          }
      }
      printf("%i\n",count);
  }