Types, var, const and conversion.
✍️ 2 exercises in this lessonint, long: whole numbersdouble, float, decimal (use for money)bool, char, stringvar: the compiler infers the typeconst: a compile-time constantImplicit (int → double) happens automatically. Explicit: (int) 9.7, Convert.ToInt32("42"), int.Parse("42"), or the safe int.TryParse().
Mastering C# Variables & Data Types helps you write clean and reliable C# code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
int age = 25;
decimal price = 1999.99m;
bool active = true;
char grade = 'A';
string name = "Sara";
var city = "Karachi";
const double TaxRate = 0.18;
Console.WriteLine($"{name} ({age}) from {city}, grade {grade}, active {active}");
Console.WriteLine($"Price with tax: {price * (decimal)(1 + TaxRate):F2}");
int parsed = int.Parse("42");
bool ok = int.TryParse("abc", out int bad);
Console.WriteLine($"{parsed + 8} {ok} {bad}");
Console.WriteLine((int) 9.7);Sara (25) from Karachi, grade A, active True Price with tax: 2359.99 50 False 0 9
Check what you learned in “C# Variables & Data Types”.
Use the exact type for money.
price = 1999.99m;
Which method converts safely and returns false on bad input?
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