To perform different actions depending on the different decisions we can use already mentioned logical operators and the conditional statement if.

if executes the block of code if the condition is true. In C++, it's implemented as follows:

 if (condition) {
     // code here will be executed if the condition is true
 }

For example, we know how to check if the variable x is greater than y. Let’s write the message (with the statemant if) if this condition is true (x is bigger than y):

#include <iostream>
using namespace std;

int main() {
    // Define variables
    int x = 7;
    int y = 5;

    // Check the condition
    if (x > y) {
        cout << "x is bigger than y";
    }
    return 0;
}

As x is 7, and y is 5, x is greater than y, so our condition is true and the code will print the message "x is bigger than y".

The statement if is case sensitive. It means that usage of uppercase letters (If or IF) will cause an error.