pc-ip-17.c

Metadata

• Author — Amit Dutta (amitdutta4255@gmail.com)
• Last updated — 05 Jan 2026
• License — MIT

Problem Statement

Problem Statement

Question 17: Write a C program that includes a user-defined function named isPerfect with the signature int isPerfect(int num);.

Source Code

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#include <stdio.h>

int isPerfect(int);

int main()
{
    int num;
    printf("Enter the number : ");
    scanf("%d", &num);
    if (isPerfect(num))
    {
        printf("\nInput '%d' is a perfect number.", num);
    }
    else
    {
        printf("\nInput '%d' is not a perfect number.", num);
    }
    return 0;
}

int isPerfect(int n)
{
    int i, sum = 0;
    for (i = 1; i <= n / 2; i++)
    {
        if (n % i == 0)
        {
            sum += i;
        }
    }
    return sum == n;
}