Exer 6

Output:
#include
#include

float grade, average, items, sum;
void main()
{
clrscr();
average=0;
sum=0;
do
{
printf("Enter grade (-1 to exit): ");
scanf("%f", &grade);
if((grade!=-1)&&(grade<=100)) { items++; sum=sum+grade; } }while(grade!=-1); average=sum/items; printf("Class Average: %.2f\n", average); if((average>=95)&&(average<=100)) { printf("Rating: A"); } else if((average>=90)&&(average<=94)) { printf("Rating: B"); } else if((average>=85)&&(average<=89)) { printf("Rating: C"); } else if((average>=80)&&(average<=84)) { printf("Rating: D"); } else if((average>=75)&&(average<=79)) { printf("Rating: E"); } else if(average<=74) { printf("Rating: FAILED"); } getch(); }