EXER6 CS121

#include
#include


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

while(grade!=-1)
{ sum=sum+grade;
printf("\n\n_-_-_-_-_-_-_-_-_-_-_");
printf("\nEnter grade; -1 to exit");
scanf("%f",&grade);

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