How do I use if-else statements in C++?

How do I use if-else statements in C++?

In C++, if-else statements allow you to execute different blocks of code based on certain conditions. Here's a basic structure:

if (condition) {
    // code to execute if condition is true
} else {
    // code to execute if condition is false
}

Can you give me an example?

Sure! Here's an example that checks if a number is positive or negative:

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

if (number > 0) {
    std::cout << "The number is positive.";
} else {
    std::cout << "The number is negative or zero.";
}

What if I want to check multiple conditions?

You can use else if to check multiple conditions. Here's an example:

if (number > 0) {
    std::cout << "Positive";
} else if (number < 0) {
    std::cout << "Negative";
} else {
    std::cout << "Zero";
}

Thanks! What about nested if-else statements?

Nested if-else statements are if-else statements within another if-else statement. Here's an example:

if (number != 0) {
    if (number > 0) {
        std::cout << "Positive";
    } else {
        std::cout << "Negative";
    }
} else {
    std::cout << "Zero";
}