Variable: Variable is representing a temporary value, the value can be changed.
Syntax: To declare variable <data type> <variable name> = <value>;
Eg: int a = 10; string s = "Stahya";
Eg: for variable: void main(---) { int a = 10; string s = "Sathya"; Console.WriteLine(a); Console.WriteLine(s); Console.ReadLine(); } Output: 10 Sathya Eg: for case sensitive: void main(---) { int a = 10; Console.WriteLine(a); Console.ReadLine(); } Output: Output for above program is error because C#.Net is a case sensitive language.
Local variables: The variables which is declared within a function can be called aslocal variable.
Local variable should be initialized at the time of declaration otherwise compiler will generate an error.
Eg: for local variable: void main(---) { int a; Console.WriteLine(a); Console.ReadLine(); } Output: The above program will generate an error because 'a' is a local variable, local variables should be initialized at the time of declaration like below: int a = 10;
Eg: Print a variable value with user defined string: void main(---) { int a = 10; Console.WriteLine("a value is " +a); Console.ReadLine(); } Output: a value is 10
To write the comments we will use two forwarding slashes(//).
Eg: To print multiple user defined message with variable values: void main(---) { int a = 10; int b = 20; string s = "Sathya"; Console.WriteLine("a value is " +a); Console.WriteLine("b value is " +b); Console.WriteLine("s value is " +s); Console.ReadLine(); } Output: a value is 10 b value is 20 s value is sathya
Eg: To accept input from the user: void main(--) { Console.WriteLine("Enter your name"); string s = Console.ReadLine(); Console.WriteLine("Your name is " +s); Console.ReadLine(); } Output: Enter your name Sathya Your name is Sathya
