## Introduction

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

#include <iostream> using namespace std; // Function declarations long long fact(int num); void printStrongNumbers(int start, int end); int main() { int start, end; /* Input start and end range */ cout<<"Enter the lower limit: "; cin>>start; cout<<"Enter the upper limit: "; cin>>end; cout<<"List of strong numbers between"<<start<<"to "<<end << " are: "<<endl; printStrongNumbers(start, end); return 0; } //Printing all strong numbers in a given range void printStrongNumbers(int start, int end) { long long sum; int num; // Iterates from start to end while(start != end) { sum = 0; num = start; // Calculating sum of factorial of digits while(num != 0) { sum += fact(num % 10); num /= 10; } // If sum of factorial of digits equal to current number if(start == sum) { cout<<start<<endl; } start++; } } //Recursively find factorial of any number long long fact(int num) { if(num == 0) return 1; else return (num * fact(num-1)); }