Exercises 6

#include
#include

void main()
{ clrscr();
float grade,average,sum;
int a=0;

while(grade!=-1)
{ sum=sum+grade;
textcolor(GREEN);cprintf("Enter grade: -1 to exit");
scanf("%f",&grade);

if(grade==-1)
{printf("Average is %.2f\n",average=sum/a);}
a++;
}
if(average>=95 && average<=100){ printf("Rated A");} else if(average>=90 && average<=94){ printf("Rated B");} else if(average>=89 && average<=90){ printf("Rated C");} getch(); }