check if cin didn't get int

To check if cin didn't get an int in C++, you can use the fail member function of the cin object. Here are the steps to do this:

1. Include the necessary header file: #include <iostream>.

2. Declare a variable to store the input: int num;.

3. Use the >> operator to read the input from the user: std::cin >> num;.

4. Check if the input was successful using the fail member function of the cin object: if (std::cin.fail()).

5. If the input failed, it means that cin didn't get an int. You can handle this situation accordingly, for example, by displaying an error message or asking the user to enter a valid int.

Here's an example code snippet that demonstrates these steps:

#include <iostream>

int main() {
    int num;

    std::cout << "Enter an integer: ";
    std::cin >> num;

    if (std::cin.fail()) {
        std::cout << "Invalid input. Please enter a valid integer." << std::endl;
        return 1;
    }

    std::cout << "You entered: " << num << std::endl;

    return 0;
}

In this example, if the user enters a non-integer value, such as a character or a string, the cin.fail() condition will evaluate to true, and an error message will be displayed. If the user enters a valid integer, it will be stored in the num variable and displayed on the console.