C Program to Check whether a given Number is Perfect Number

Here is source code :

```
/*
```

 * C Program to Check whether a given Number is Perfect Number

```
 */
```
```
#include <stdio.h>
```
```
 
```
```
int main()
```
```
{
```
```
    int number, rem, sum = 0, i;
```
```
 
```
```
    printf("Enter a Number\n");
```
```
    scanf("%d", &number);
```
```
    for (i = 1; i <= (number - 1); i++)
```
```
    {
```
```
        rem = number % i;
```
```
 if (rem == 0)
```
```
        {
```
```
            sum = sum + i;
```
```
        }
```
```
    }
```
```
    if (sum == number)
```

        printf("Entered Number is perfect number");

```
    else
```

        printf("Entered Number is not a perfect number");

```
    return 0;
```
```
}
```

Output :

Enter a Number
6
Entered Number is perfect number
 
Enter a Number
100
Entered Number is not a perfect number

Explanation :

Number is 6 .

Its positive divisors are 1,2,3

1+2+3=6

therefore 6 is perfect number.

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