I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int lower, higher, i, temp1, temp2, remainder, n = 0, result = 0;
//Reading two numbers from user
cout<<"Enter two numbers: ";
cin>>lower;
cin>>higher;
cout<<"Armstrong numbers between "<< lower << " and "<<higher << " are: ";
for(i = lower + 1; i < higher; ++i)
{
temp2 = i;
temp1 = i;
// number of digits calculation
while (temp1 != 0)
{
temp1 /= 10;
++n;
}
// result contains sum of nth power of its digits
while (temp2 != 0)
{
remainder = temp2 % 10;
result += pow(remainder, n);
temp2 /= 10;
}
// checking if number i is equal to the sum of nth power of its digits
if (result == i) {
cout<<i<<endl;
}
// resetting the values to check Armstrong number for next iteration
n = 0;
result = 0;
}
return 0;
}

I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

Result:Enter two numbers: 200

500

Armstrong numbers between 200 and 500 are: 370

371

407

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