C Exercises: Check whether a non-negative given number is a multiple of 3 or 7, but not both

Last update on May 27 2022 12:20:05 (UTC/GMT +8 hours)

C-programming basic algorithm: Exercise-20 with Solution

Write a C program to check whether a non-negative given number is a multiple of 3 or 7, but not both.

C Code:

#include <stdio.h>
#include <stdlib.h>

int main(void){
    printf("%d",test(3));
    printf("\n%d",test(7));
    printf("\n%d",test(21));
    }   
    
    int test(int n)
         {
            return n % 3 == 0 ^ n % 7 == 0;

        }

Sample Output:

1
1
0

Pictorial Presentation:

C Programming Algorithm: Check whether a non-negative given number is a multiple of 3 or 7, but not both

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP