For legal integer variables, the first letter of the variable name must start with a letter (a-z A-Z), an underscore (_) or a dollar sign ($), and all variables in php programming must start with a $. Some compilers already support Chinese variable names.

Variable names can only be a combination of letters (a-z A-Z), numbers (0-9) and underscores (_), with no spaces in the middle, and numbers cannot be placed at the top of variable names. In programming languages, reserved words cannot be used in variable names.

Integer variable is a computer language. In C language, the values of integer variables can be decimal, octal and hexadecimal, but binary numbers are stored in memory. Variables, as the name implies, are variables whose values can be changed, and integer variables represent integer data.