Description

To calculate grade first calculate the percentage marks of student.
Now according to percentage, find grade of student.

C/C++

/* C Program to calculate Grade of Student */
//Save it as GradeStudent.c

#include<stdio.h>
int main(){

    int i, numSub;
    float marks[10], totalMark=0, percentageMarks;

    printf("Enter number of subjects : ");
    scanf("%d",&numSub);

    for(i=0;i<numSub;i++){
        printf("Enter mark of %d subject : ",(i+1));
        scanf("%f",&marks[i]);
        
        //Calculate total marks
        totalMark += marks[i];
    }

    //Calculate percentage of Marks
    percentageMarks = totalMark/numSub;

    printf("\nPercentage marks : %.2f %\n",percentageMarks);

    //Check grade
    if(percentageMarks >= 80){
        printf("Grade A");
    }else if(percentageMarks>=60 && percentageMarks < 80){
        printf("Grade B");
    }else if(percentageMarks>=40 && percentageMarks < 60){
        printf("Grade C");
    }else{
        printf("Fail");
    }

    return 0;
}

Input:
Enter number of subjects : 5
Enter mark of 1 subject : 65
Enter mark of 2 subject : 86
Enter mark of 3 subject : 52
Enter mark of 4 subject : 64
Enter mark of 5 subject : 76

Output:
Percentage marks : 68.6%
Grade B

Java

/* Java Program to calculate Grade of Student */
//Save it as GradeStudent.java

import java.io.*;
import java.util.Scanner;

public class GradeStudent {

    public static void main(String[] args) {

            Scanner scanner = new Scanner(System.in);
        
            int i, numSub;
        float totalMark=0, percentageMarks;
        
        float marks[] = new float[10]; 

        System.out.println("Enter number of subjects : ");
        numSub = scanner.nextInt();

        for(i=0;i<numSub;i++){
            System.out.println("Enter mark of "+(i+1)+" subject : ");
            marks[i] = scanner.nextFloat();
            
                //Calculate total marks
            totalMark += marks[i];
        }

            //Calculate percentage of Marks
        percentageMarks = totalMark/numSub;

        System.out.println("Percentage marks : "+percentageMarks+"%");
        
            //Check grade
        if(percentageMarks >= 80){
            System.out.println("Grade A");
        }else if(percentageMarks >= 60 && percentageMarks < 80){
            System.out.println("Grade B");
        }else if(percentageMarks <= 40 && percentageMarks > 60){
            System.out.println("Grade C");
        }else{
            System.out.println("Fail");
        }
    }
}

Input:
Enter number of subjects : 
5
Enter mark of 1 subject : 
65
Enter mark of 2 subject : 
86
Enter mark of 3 subject : 
52
Enter mark of 4 subject : 
64
Enter mark of 5 subject : 
76

Output:
Percentage marks : 68.6%
Grade B

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