C # foundation and type conversions

Commenting on a single line of namespaces (namespace Firstdebug)

Class program main function, an entire project, with only one main function, which is the entry of the procedure (static void main (string[] args)

Data type variable name = value;

int i=0; or separate write int s; s=1;

Define multiple int a,b,c at the same time; b=3;

Double d=1.23d;---end plus d for double type float f=1.23f;  Decimal m=1.23m;  BOOL Bo=true; String s1= "Hello";

Console.WriteLine (i); Console.ReadLine ();

Color of the class: Dark blue constant: const+ A data type such as a const double d=1.23 (x) constant is not assigned and can only be referenced

Type conversion: int i=4; int s=5;  Double jieguo= (double) i/s; (the parentheses are converted directly before the variable to cast, only for Double,int,decimal) string ss=i.tostring ();

(Convert I to String type) string s1= "3.5"; Double dd=double. Parse (S1);

Convert S1 to double type or double ds=convert.todouble (S1);

C # foundation and type conversions