how do i optimize this code?

Question

#include<iostream>
using namespace std;
int main()
{
int a, orig, rem=0,arm=0;
cin>>a;
orig==a;
while(a!=0)
{
rem=a%10;
arm=arm+(rem*rem*rem);
a=a/10;
}
if(arm==orig)
cout<<”yes";
else
cout<<"no";
return 0;
}
error was
you program took more time then expected time
expected timelimit was <0.6144 seconds
please optimize this code.

Answer 1

Instead of `a!=0` use this condition: `a>=0`
Because in many cases, it can be possible that `a` never becomes equal to 0. So instead of that, you can check if `a` become smaller than 0, that must happen in every case.
And as Anna has pointed out, you are using == instead of =. So this means, orig is hanging around with garbage value. Which leads us to the fact that your code will always print "no".

Answer 2

orig=a; (instead of ==)

Answer 3

thanks Anna and Zlytherin ,actually i did use assignment operator there instead of == and after changing a!=0 to a>=0 its still showing the same error , actual it regarding online test and it want an optimize code .

Answer 4

its a program for checking an Armstrong number