﻿ C exercises: Check whether a given number is a perfect number or not - w3resource

# C Exercises: Check whether a given number is a perfect number or not

## C For Loop: Exercise-27 with Solution

Write a c program to check whether a given number is a perfect number or not.

Pictorial Presentation:

Sample Solution:

C Code:

``````/*Perfect number is a positive number which sum of all positive divisors excluding that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3.  Sum of its divisor is 1 + 2+ 3 = 6*/
#include <stdio.h>

void  main()
{
int n,i,sum;
int mn,mx;

printf("Input the  number : ");
scanf("%d",&n);
sum = 0;
printf("The positive divisor  : ");
for (i=1;i<n;i++)
{
if(n%i==0)
{
sum=sum+i;
printf("%d  ",i);
}
}
printf("\nThe sum of the divisor is : %d",sum);
if(sum==n)
printf("\nSo, the number is perfect.");
else
printf("\nSo, the number is not perfect.");
printf("\n");
}
```
```

Sample Output:

```Input the  number : 56
The positive divisor  : 1  2  4  7  8  14  28
The sum of the divisor is : 64
So, the number is not perfect.
```

Flowchart:

C Programming Code Editor:

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