/* Problem 6-2 */
#include <stdio.h>

  /* Input variables */
  char grade[50];
  int input;

int main()
{
  /* Input prompt */
  printf("Please enter a numeric grade: ");
  fgets(grade, sizeof(grade), stdin);
  sscanf(grade, "%d", &input);
  /* Grade check routine */
  if (input >= 91) {
    printf("\n");
    printf("The grade is a \'A\'");
  }
  if (input > 60 && input <= 70) {
    printf("\n");
    printf("The grade is a \'D\'");
  }
  if (input > 70 && input <= 80) {
    printf("\n");
    printf("The grade is a \'C\'");
  }
  if (input > 80 && input <= 90) {
    printf("\n");
    printf("The grade is a \'B\'");
  } else {
    printf("\n");
    if (input < 60) {
      printf("The grade is a \'F\'\n");
    }
  }
  return 0;
}