﻿ C exercises: Find perfect numbers within a given number of range - w3resource

# C Exercises: Find perfect numbers within a given number of range

## C For Loop: Exercise-28 with Solution

Write a c program to find the perfect numbers within a given number of range.

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 starting range or number : ");
scanf("%d",&mn);
printf("Input the ending range of number : ");
scanf("%d",&mx);
printf("The Perfect numbers within the given range : ");
for(n=mn;n<=mx;n++){
i=1;
sum = 0;
while(i<n){
if(n%i==0)
sum=sum+i;
i++;
}
if(sum==n)
printf("%d ",n);
}
printf("\n");
}
```
```

Sample Output:

```Input the starting range or number : 1
Input the ending range of number : 50
The Perfect numbers within the given range : 6 28
```

Flowchart:

C Programming Code Editor:

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## C Programming: Tips of the Day

How to format strings using printf() to get equal length in the output?

You can specify a width on string fields, e.g.

`printf("%-20s", "initialization...");`

And then whatever's printed with that field will be blank-padded to the width you indicate.

The - left-justifies your text in that field.

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