Compiler is not showing some result

Question

So i made a simple nth armstrong number program

#include<iostream>
#include<cmath>
using namespace std;
int armnum(int n);
int countnum(int n);

int countnum(int n){
int a=0;
while(n>0){
n=n/10;
a++;
}
return a;
}

int armnum(int n){
int sum=0,temp;
temp=n;
while(n>0){
sum=sum+pow(n%10,countnum(temp));
n=n/10;
}
return sum==temp;
}

int main(){
int f,l;
cin>>f>>l;
while(f<l){
if(armnum(f)){
cout<<f<<endl;
}
f++;
}

return 0;

}

(takes two input
one input
enter
second input)
(codeblock used)
if i run this on MinGW compiler it misses some number like 153 (run code)which is a armstrong number but if i compile this online it give correct result. I have also tested using different program on mingw(thought mine was wrong) but it still missing some numbers.
How to fix this?

Answer 1

I installed cygwin its working as it supposed to work