01problemcorrection.c

#include <stdio.h>

int main()
{
    int marks1, marks2, marks3;
    float average;

    // Input marks
    printf("Enter marks1:\n");
    scanf("%d", &marks1);

    printf("Enter marks2:\n");
    scanf("%d", &marks2);

    printf("Enter marks3:\n");
    scanf("%d", &marks3);

    // Calculate average
    average = (marks1 + marks2 + marks3) / 3.0;  // Use 3.0 for floating-point division

    // Print average
    printf("The average is %.2f\n", average);  // Use %.2f for floating-point output

    // Determine and print grade
    if (average >= 33 && average < 55)
    {
        printf("Congratulations! You have passed.\n");
        printf("Your grade is D\n");
    }
    else if (average >= 55 && average < 60)
    {
        printf("Congratulations! You have passed.\n");
        printf("Your grade is C\n");
    }
    else if (average >= 60 && average < 90)
    {
        printf("Congratulations! You have passed.\n");
        printf("Your grade is B\n");
    }
    else if (average >= 90 && average <= 100)
    {
        printf("Congratulations! You have passed.\n");
        printf("Your grade is A\n");
    }
    else if (average < 33)
    {
        printf("Unfortunately! You have failed.\n");
        printf("Your grade is E\n");
    }

    return 0;
}