gpa

#include<stdio.h>
void main()
{
   int i,a[5],j;
   float GPA=0.00,avrg;
   for(i=0;i<5;i++)
   {
    scanf("%d",&a[i]);
   if(a[i]<33)
   printf("F");
   {
    j=a[i]/10;
   switch(j)
   {
   case 3:printf("D\n");
   GPA=+1.00;
        break;
   case 4:printf("C\n");
   GPA=GPA+2.00;
        break;
   case 5:printf("B\n");
   GPA=GPA+3.00;
        break;
   case 6:printf("A-\n");
   GPA=GPA+3.50;
        break;
   case 7:printf("A\n");
   GPA=GPA+4.00;
        break;
   case 8:
   case 9:
   case 10:printf("A+\n");
   GPA=GPA+5.00;
        break;
   defalt:printf("ERROR");
   }
   }
   }

   avrg=GPA/5;

   printf("\nAverage is %f\n",avrg);

   }