CALCULATE GRADE in C Programming

CALCULATE GRADE in C Programming
Code:
  #include<stdio.h>
int main()
{
  int a,b,c,avg=0;
  scanf("%d", &a);
  scanf("%d", &b);
  scanf("%d", &c);
  avg=(a+b+c)/3;
  if(avg>=90)
    printf("The grade is A");
  else if ((avg>=80)&&(avg<90))
         
           printf("The grade is B");
           else if ((avg>=70)&&(avg<80))
           printf("The grade is C");
           else if((avg>=60)&&(avg<70))
           printf("The grade is D" );
           else if((avg>=50)&&(avg<60))
           printf("The grade is E");
           else if(avg<50)
           printf("The grade is F");
           return 0;
           }