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();
}