Student Marks Validation || C Lab Programs

Program 07: Student subject pass/fail check. 

Problem Statement:: Develop a C program that takes marks for three subjects as input. Use a function to check if the student has passed (minimum 40 marks in each subject). Display the average and whether the student passed or failed. 

Problem Description:

• Input: Three integers representing marks in three subjects.

• Output: The average marks and a "Passed" or "Failed" status message.

• Constraints: Marks should be in the range 0 to 100; passing requires at least 40 marks in every subject.

• Method: Implement a custom function isPassed() to handle the validation logic. 

Pgm Logic:

1. Start.

2. Input marks for three subjects.

3. Calculate the average: average = (m1 + m2 + m3) / 3.0.

4. Call the function isPassed(m1, m2, m3).

5. Inside the function:

• If all three marks are $\ge$ 40, return 1 (Pass).

• Else, return 0 (Fail).

6. In the main program, display the average.

7. If the function returned 1, print "Passed", otherwise print "Failed".

8. Stop. 

Program Code:

// Purpose: To check subject pass status and calculate average marks using a custom function.

#include <stdio.h>

int isPassed(int m1, int m2, int m3)

{

    if (m1 >= 40 && m2 >= 40 && m3 >= 40)

        return 1;

    else

        return 0;

}

void main()

{

    int s1, s2, s3;

    float average;

    printf("Enter marks for three subjects: ");

    scanf("%d %d %d", &s1, &s2, &s3);

    average = (s1 + s2 + s3) / 3.0;

    printf("Average Marks: %.2f\n", average);

    if (isPassed(s1, s2, s3))

        printf("Result: Passed\n");

    else

        printf("Result: Failed\n");

}

Output: 

Enter marks for three subjects: 50 60 70 

Average Marks: 60.00 Result: Passed 

RESULT: Thus the program has been executed and the output was verified. 

Remarks: Compiled and run in Code::Blocks. This program demonstrates modular programming by separating the logic for "passing" into its own reusable function. 

Program Explanation: The main function handles data entry and math, while the isPassed function acts as a "gatekeeper" that checks the specific criteria for passing. Even if the average is high, the student fails if any single subject is below 40.

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