Introduction :
To check prime and armstrong number by making functions
I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.
Write C++ program to check prime and armstrong number by making functions
#include <iostream>
#include <math.h>
using namespace std;
int checkPrimeNumber(int n);
int checkArmstrongNumber(int n);
int main(){
int num, flag;
cout<<"Enter a positive integer: ";
cin>>num;
// Checking prime number
flag = checkPrimeNumber(num);
if (flag == 1)
cout<<num<<" is a prime number"<<endl;
else
cout<<num<<" is not a prime number"<<endl;
// Checking Armstrong number
flag = checkArmstrongNumber(num);
if (flag == 1)
cout<<num<<" is a Armstrong number"<<endl;
else
cout<<num<<" is a not an Armstrong number"<<endl;
return 0;
}
//function to check prime number
int checkPrimeNumber(int num)
{
int i, flag = 1;
for(i=2; i<=num/2; ++i)
{
// condition for non-prime number
if(num%i == 0)
{
flag = 0;
break;
}
}
return flag;
}
//function to check Armstrong Number
int checkArmstrongNumber(int number)
{
int originalNumber, remainder, result = 0, num = 0, flag;
originalNumber = number;
while (originalNumber != 0)
{
originalNumber /= 10;
++num;
}
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += pow(remainder, num);
originalNumber /= 10;
}
// condition for Armstrong number
if(result == number)
flag = 1;
else
flag = 0;
return flag;
}
Result
