** Machine Problem **

A number which is only divisible by itself and 1 is known as prime number, for example: 7 is a prime number because it is only divisible by itself and 1.

Write a program to ask the user to give a number and then the program will check and determine if the given number is a prime number or not.

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**Program Listing**

**prime_number.cpp**

```
// prime_number.cpp
//
// Machine Problem
//
// A number which is only divisible by itself and 1 is known as prime number,
// for example: 7 is a prime number because it is only divisible by itself and 1.
//
// Write a program to ask the user to give a number and then the problem will
// check and determine if the given number is a prime number or not.
//
// Jake Rodriguez Pomperada, MAED-IT, MIT
// www.jakerpomperada.com www.jakerpomperada.blogspot.com
// jakerpomperada@gmail.com
// Bacolod City, Negros Occidental Philippines.
#include <iostream>
int num_val=0,i=0;
bool flag = true;
int main(){
std::cout << "\n\n";
std::cout << "\tPrime Number in C++";
std::cout << "\n\n";
std::cout<<"\tGive a Number (Positive Number Only) : ";
std::cin>>num_val;
std::cout << "\n";
for(i = 2; i <= num_val / 2; i++) {
if(num_val % i == 0) {
flag = false;
break;
}
}
if (flag==true) {
std::cout<<"\tThe given number "<<num_val<<" is a prime number.";
}
else {
std::cout<<"\tThe given number "<<num_val<<" is not a prime number.";
}
std::cout <<"\n\n";
std::cout <<"\tEnd of Program\n";
}
```