This C Program is for to identify perfect number. Here program is accepting range up to which need to identify perfect number. Perfect number is a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. for example 6 where it is divisible for 1, 2, 3 so sum of it is 6. To write this program we have used two for loop along with simple if condition.

```
// Program to find perfect number
#include <stdio.h>
int main() {
// Write C code here
int rangeNo,counterNo,perSum;
printf("\n\tEnter Range to find perfect number \t");
scanf("%d",&rangeNo);
//Loop to find divisible numbers
for (int i = 1;i<=rangeNo;i++)
{
perSum=0;
for (int j = 1;j<i;j++)
{
if (i%j == 0)
perSum = perSum + j;
}
if (perSum == i)
printf("\n\t %d is perfect number ",i);
}
return 0;
}
```

**Output**

```
Enter Range to find perfect number 10000
6 is perfect number
28 is perfect number
496 is perfect number
8128 is perfect number
```