prime template c++

To create a prime template in C++, you can follow these steps:

1. Define a function called isPrime that takes an integer parameter num and returns a boolean value. This function will check whether the given number is a prime number or not. The implementation of this function will typically involve iterating from 2 to the square root of num and checking if any number divides num evenly.

2. In the main function, declare an integer variable n to store the user input.

3. Prompt the user to enter a number and read it from the console using the cin statement.

4. Call the isPrime function, passing the value of n as the argument. Store the returned boolean value in a variable, let's say result.

5. Check the value of result using an if statement. If result is true, then print a message indicating that the number is prime. Otherwise, print a message indicating that the number is not prime.

6. End the program by returning 0 from the main function.

Here is an example code snippet that demonstrates the implementation of the prime template in C++:

#include <iostream>
#include <cmath>

bool isPrime(int num) {
    if (num < 2) {
        return false;
    }

    for (int i = 2; i <= sqrt(num); i++) {
        if (num % i == 0) {
            return false;
        }
    }

    return true;
}

int main() {
    int n;

    std::cout << "Enter a number: ";
    std::cin >> n;

    bool result = isPrime(n);

    if (result) {
        std::cout << "The number is prime." << std::endl;
    } else {
        std::cout << "The number is not prime." << std::endl;
    }

    return 0;
}

Note: The above code snippet checks whether a number is prime or not using the trial division method. It iterates over numbers from 2 to the square root of the given number and checks if any number divides the given number evenly. If a divisor is found, the number is not prime. Otherwise, it is prime.