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 ranges.

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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