//
//
#include <stdio.h>

int main()
{
  float a, b, c, d, score;

  printf("Enter thresholds for A, B, C, D\nin that order, decreasing percentages > ");
  scanf("%f%f%f%f", &a, &b, &c, &d);
  printf("Thank you. Now enter student score (percent) >");
  scanf("%f", &score);

  if(score >= a)
    printf("Student has an A grade\n");
  if(score >= b && score < a)
    printf("Student has an B grade\n");
  if(score >= c && score < b)
    printf("Student has an C grade\n");
  if(score >= d && score < c)
    printf("Student has an D grade\n");
  if(score < d)
    printf("Student has failed the course\n");

  return 0;
}