C # Learning Note One (data type, escape character)

1. Data type conversions:
   1. 1 using Convert
   2. 1 For example: string str = "1245.351";
      Double db = convert.todouble(str);
   3. 1 Use cast type, that is, precede the type with parentheses (type name)
   4. 1 For example: double n1 = (double) N1
   5. 1 Note: Each type can be converted to a string type.
   6. 1 For example: string str = n1. ToString ();
      String str2 = db. ToString ();
   7. 1 Using the Parse method
   8. 1 For example: int n3 = Int.Parse(str);

2. Escape characters:

2.1 When using @, you can save the meaning of the escape character, the original format output!

　　　　2.2 Example: String bb = @ "Moon Light Before Bed"
Suspected to be ground frost "; (output here with a carriage return)

string path = @ "f:\c#\ self-taught. avi"; (The output path can be directly output without using a double slash)

　3. Placeholder {0}{1} ...

3.1 Placeholder {0:0.00} means:

Double DB2 = 3.333333;

Console.WriteLine ("{0:0.00}", DB2); The placeholder output here is two decimal places

3.2 The position of the placeholder is the title:

The following N1, N2, DB, DB2 correspond to {0},{1},{2},{3}. So the adjustment {0},{1},{2},{3} here in the double quotation mark position can be used for different positions to output
Console.WriteLine ("\n{3};\n{1};\n{0};\n{2}", N1, N2, DB, DB2);

C # Learning Note One (data type, escape character)