Exercise 5

#include
#include
#define p printf
#define s scanf

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

getch();
}