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:

Flowchart :Find perfect numbers within a given number of range

C Programming Code Editor:

Improve this sample solution and post your code through Disqus.

Previous: Write a c program to check whether a given number is a perfect number or not.
Next: Write a C program to check whether a given number is an armstrong number or not.

What is the difficulty level of this exercise?



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