C Basic Syntax

1 write two consecutive semicolons, the 2nd semicolon is an empty statement, the empty statement is not actually doing anything, the syntax is correct, compile without error.

An empty statement can increase the readability of a program, and can be used as a function body, loop body, and statement block to be written. Therefore, an empty statement can be useful.

2 signed unsigned short long

The 4 modifiers apply to int, but only signed and unsigned apply to the Char,long for double. when you use short and long to modify int, the 3 characters of int can be omitted

3 A semicolon is required at the end of a class definition in C + +, a member of a class is private by default, a member variable in a class cannot be initialized, and a member function in a class can have a default value.

C Basic Syntax