/* Positieve nested if logic from bottom of condition_action table */
/*Given grades of 4 tests. Get A if average is 90 or above*/
/*B if average is 80-89, C if average is 70-79, D if average is 60-69*/
/*F if average is lower than 60*/


#include <stdio.h>

float test1, test2, test3, test4, average;
char grade;

void main() {
  printf("Type 4 test scores\n");
  scanf ("%f%f%f%f", &test1, &test2, &test3, &test4);
  average = (test1+test2+test3+test4)/4;
  if (average<60.0)
    grade = 'F';
  else if (average<70.0)
    grade = 'D';
  else if (average<80.0)
    grade = 'C';
  else if (average<90.0)
    grade = 'B';
  else
    grade = 'A';
  printf ("%c\n", grade);
}