Summary - Variables

Declare typed variables to write a small profile program.

Summary - Variables

In this section you learned the basics of variables:

declaring variables with int, double, char, bool, float
auto for compiler type deduction
const for immutable variables
constexpr for compile-time constants
static_cast for safe type conversion

Now you will reinforce these concepts with two mini tasks.

Exercise Print three types on one line

Inside main, declare an int (value 5), a double (value 1.5) and a char (value 'X'). Chain all three in a single std::cout line and end with std::endl.

Show example solution

#include <iostream>

int main() {
    // Declare an int, a double and a char
    int count = 5;
    double rate = 1.5;
    char label = 'X';
    // Print all three on one line with std::cout
    std::cout << count << rate << label << std::endl;
    return 0;
}

Exercise Constant and conversion together

Inside main, declare const double pi = 3.14159;. Use static_cast<int> to convert pi to int and assign it to a variable named rounded. Then print rounded with std::cout using std::endl.

Show example solution

#include <iostream>

int main() {
    // Define const double pi
    const double pi = 3.14159;
    // Convert pi to int with static_cast and print
    int rounded = static_cast<int>(pi);
    std::cout << rounded << std::endl;
    return 0;
}

Test yourself

Immutable variable

____ int maxLevel = 50;

Show answer

const int maxLevel = 50;

Match the section concepts

auto

Type deduction
const

Immutable
constexpr

Compile time
static_cast

Type conversion

Next lesson: Integer types

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