Check prime number using function in C++

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This program checks if a given number is prime or not. It first takes input of the number to be checked from the user using the cin function. Then it calls the prime function, which takes the number as an argument.

The prime function initializes variables i, m, and flag to 0. m is the upper limit of the range of divisors to be checked. It then checks if the number is divisible by any number from 2 to m. If it is, then the function prints that the number is not prime and sets the flag variable to 1. If the number is not divisible by any number in this range, then it is prime, and the function prints that the number is prime. Finally, the main function returns 0 and the program ends.

Source Code

#include<iostream>
using namespace std;
void prime(int n)
{
    int i,m=0,flag=0;
    m=n/2;
    for(i=2;i<=m;i++)
    {
        if(n%i==0)
        {
            cout<<"Number is not Prime."<<endl;
            flag=1;
            break;
        }
    }
    if(flag==0)
        cout<<"Number is Prime."<<endl;
}
int main()
{
    int n;
    cout<<"Enter the Number to check Prime: ";
    cin>>n;
    prime(n);
    return 0;
}

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Output

Enter the Number to check Prime: 10
Number is not Prime.

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