Multiline comment/*
*/
Note: the multiline comment can be nested single-line comments
The purpose of the calculator, it is mainly used to help people processing data,
Constants: in the operation of the computer the same amount of
Integer constants:
Floating-point constants:
Character constants:
String constants:
Variables: in the operation of the computer can change the amount of
Define a variable, the type of the variable name=value;
Char types to use single quotes Char a="d"; Can is a space
Data type
Int the integer class 4 bytes
Float single-precision floating-point type 4 bytes (float type f) after
Double double-precision floating-point type 8 bytes (the default is type double)
A decimal precision floating-point number 16 bytes (behind the decimal plus m)
Char character type 2 bytes
String string type
Boolean logic value (true/false) 1 byte true/false
Key words have special meaning, can't use,
Data types classified two categories: value types and reference types
Character conversion
Int h=20;
Int m=30;
Int temp=h;
H=m;
M=temp.
Variable naming rules
1, the same variable name cannot be repeated definition;
2, the variable names cannot begin with Numbers;
3, variable naming it can contain only letters, Numbers, underscore;
4, variable names are case sensitive.
5, see knowledge meaning
6, hump named hair, all lowercase for the first word, starting from the two words, capitalize the first letter; For example: totalAcore;
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response:
CodePudding user response: