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Home » C » Structures » C Program Find the Validity of marks in a single subject
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C Program Find the Validity of marks in a single subject

By Dinesh Thakur

if (marks >= 0 && marks <= 100)

    printf(“Valid marks”);

    else printf(“Invalid marks”);

This program segment uses an if-else statement to test whether the marks entered are valid or not and print the appropriate message. It is assumed that for marks to be valid, it should be in the range 0 to 100, i.e., greater than or equal to zero and less than or equal to 100. We may rewrite the above code by using a test for invalid marks. The value of marks is invalid if it is outside the range 0 to 100, i. e., less than 0 or greater than 100. The if-else statement using such a test is given below.

if (marks < 0 || marks > 100)

    printf(“Invalid marks”);

    else printf(“Valid marks”);

Note that there is also another way to express the validity of marks: it should not be invalid, i. e., it should not be outside the range 0 to 100. This logic is used in the if statement given below.

if (! (marks < 0 || marks > 100))

      printf(“Valid marks”);

      else printf(“Invalid marks”);

Example: Validity of marks in a single subject

 

#include <stdio.h>

void main()

{

        int marks;

        clrscr();

        printf(“Enter the Marks :\n”);

        scanf(“%d”,&marks);

        if (marks >= 0 && marks <= 100)

           printf(“Valid marks”);

           else printf(“Invalid marks”);

           getch();

}

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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


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