C++ program to check that enter number is perfect or not..

Perfect Number:

A positive integer that is equal to the sum of its proper divisor.

e.g 6 is the sum of 1,2 and 3 which are the proper divisor.

#include <iostream>

using namespace std;

int main()

{

int loopstart,usernum,result,label,x=1;

while(x!=0)

{

int sum=0;

cout<<"Enter number to check that the number is perfect number:"<<"\n";

cin>>usernum;

result=usernum;

for(loopstart=1; loopstart<=usernum/2; loopstart++)

{

if(usernum%loopstart==0)

{

sum=sum+loopstart;

}

if(result==sum)

{

cout<<usernum<<" "<<"number is perfect"<<"\n";

goto label;

}

cout<<"\n"<<usernum<<" "<<"number is not perfect"<<"\n";

label:

cout<<"press 0 for exit to continue press 1"<<"\n";

cin>>x;

}

return 0;

}