#include
#include


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

while(grade!=-1)
{ sum=sum+grade;
textcolor(CYAN);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){ textcolor(RED+BLINK);cprintf("Rated A\n\n");} else if(average>=90 && average<=95){ textcolor(LIGHTBLUE+BLINK);cprintf("Rated B\n\n");} else if(average>=85 && average<=89){ textcolor(LIGHTCYAN+BLINK);cprintf("Rated C\n\n");} else if(average>=80 && average<=84){ textcolor(LIGHTRED+BLINK);cprintf("Rated D\n\n");} else if(average>=75 && average<=79){ textcolor(LIGHTBLUE);cprintf("Rated E\n\n");} else if(average<=74){ textcolor(LIGHTGREEN+BLINK);cprintf("SORRY!!! YOU FAILED!!!\n\n"); } getch(); }