Variables and types

Learn basic C# types like int, float and string.

Numeric Types: int and float

In C#, the int type is used to store whole numbers (such as health points, ammo count, level). For decimal and fractional values, the float type is used (such as movement speed, coordinates, time). When defining a float literal in C#, the f suffix must always be attached.

int ammo = 30;
float speed = 7.5f;

Decimal numbers without the trailing f are treated as double by default in C# and cause compilation errors.

Text and Logic Types: string and bool

The string type is used to store character sequences and text, with values enclosed in double quotes. To hold logical true/false conditions, the bool type is used. A bool variable can only hold either true or false.

string playerName = "Hero";
bool isAlive = true;

In conditional statements and game state checks, bool variables are indispensable.

Exercise Declare basic variables

Inside the Main method, declare: hero with string "Savasci", level with int 5, speed with float 4.5f, and isAlive with bool true. Then print them with Console.WriteLine(hero + " - Seviye: " + level + " - Hiz: " + speed + " - Hayatta: " + isAlive);.

Show example solution

using System;

public class Program
{
    public static void Main()
    {
        string hero = "Savasci";
        int level = 5;
        float speed = 4.5f;
        bool isAlive = true;

        Console.WriteLine(hero + " - Seviye: " + level + " - Hiz: " + speed + " - Hayatta: " + isAlive);
    }
}

Test yourself

Which suffix must be appended when writing a decimal float value in C# (e.g. 5.5)?
- s
- m
- f
- d
Show answer

f — The C# compiler defaults decimal numbers to double; for float types, 'f' or 'F' must be appended to the number.

float literal suffix

float speed = 4.5____;

Show answer

float speed = 4.5f;

Basic C# data types

int

Stores whole integer values (e.g. 10)
float

Stores floating-point numbers (3.14f)
string

Stores text in double quotes ("Unity")
bool

Stores true or false boolean value

Next lesson: Output with Debug.Log

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