China Naming Network - Ziwei Dou Shu - Naming rules of C language variables
Naming rules of C language variables
When defining a variable, the variable name can be a combination of letters, numbers and underscores. But it is not a random combination. Please note the following naming rules:
1) Variable names must start with letters or underscores, not numbers. In actual programming, the most commonly used variable names begin with letters, while variable names that begin with underscores are system-specific.