Hello friends, In this post I will show you how to make a program which is find a prime number using C++ language.

### Code explaination

- Create a void function 'isPrime' which is take two arguments 'n' and 'i'.
- 'n' is a number and 'i' have the initial value of 2.
- In this function, a while loop is running till 'i' is less than 'n'. In this loop.
- In this loop, if n%i is equal to zero then 'n' is not a prime number. otherwise it is.
- main function have four test cases to check the number is prime or not.

```
#include<iostream>
using namespace std;
void isPrime(int n, int i=2)
{
while(i<n)
{
if (n%i==0)
{
cout<<n<<" is not a prime number"<<endl;
break;
}
else
{
cout<<n<<" is a prime number"<<endl;
break;
}
i++;
}
}
int main(){
// Test cases
isPrime(17);
isPrime(16);
isPrime(23);
isPrime(20);
return 0;
}
```

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