- C++ Program to Check Prime Number Using User-defined Function

## C++ Program to check prime numbers using function

#include<iostream> using namespace std; int isPrime(int num); int main() { int num; cout << "Enter a positive number\n"; cin >> num; if(isPrime(num)) cout << num << " is a Prime Number",num); else cout << num <<" is NOT a Prime Number",num); return 0; } // returns 1 if num is prime number otherwise 0 int isPrime(int num){ int i; // Check whether num is divisible by any // number between 2 to (num/2) for(i = 2; i <=(num/2); ++i) { if(num%i==0) { return 0; } } return 1; }Output

Enter a positive number 23 23 is a Prime Number

Enter a positive number 50 50 is NOT a Prime Number

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