#include<stdio.h>

void main() {
    int percentage, total;
    int maths, science, english, hindi, sanskrit, computer;
    
    printf("n Student Percentage Calculator");
    printf("n Enter The Maths Marks: ");
    scanf("%d", &maths);
    printf("n Enter The Science Marks: ");
    scanf("%d", &science);
    printf("n Enter The English Marks: ");
    scanf("%d", &english);
    printf("n Enter The Hindi Marks: ");
    scanf("%d", &hindi);
    printf("n Enter The Sanskrit Marks: ");
    scanf("%d", &sanskrit);
    printf("n Enter The Computer Marks  : ");
    scanf("%d", &computer);
    
    void gradeformula(marks){
        printf("Final Grade Is: ");
        if(marks > 90 && marks <=100){
            printf("O");
        }
        else if(marks > 80 && marks <=90){
            printf("A+");
        }
        else if(marks > 70 && marks <=80){
            printf("A");
        }
        else if(marks > 60 && marks <=70){
            printf("B+");
        }
        else if(marks > 50 && marks <=60){
            printf("B");
        }
        else{
            printf("F");
        }
    }
    
    total = english + hindi + science + sanskrit + computer + maths;
    percentage = total / 6;
    gradeformula(percentage);
}

 Student Percentage Calculator
 Enter The Maths Marks: 85
 Enter The Science Marks: 86
 Enter The English Marks: 84
 Enter The Hindi Marks: 87
 Enter The Sanskrit Marks: 89
 Enter The Computer Marks  : 82
 Final Grade Is: A+