C

• Don't do x = b[i] + i++.
• Don't do push(pop() - pop()).

These are from Misra-C.

• Use maximum 31 characters for identifier.
• No inner scope identifier have the same name as outer scope.
• If an object only used in one function, define it there. Don't make it global.
• Only declare extern in one header file and include this header file.
• Define an external object only in its implementation file and link to this unit.
• Always use static for non external global object.
• Don't use nested assignment.
• Don't use comma operator.
• Don't use bitwise operators on signed types.
• Don't use assigment inside if conditional.
• Don't test floating point expression for equality or inequality.
• Don't modify the iterator inside loop body.
• Don't create function with variable length argument.
• If an object pointed by pointer parameter will not modified, use const.
• In function-like macro, all parameters must be used with parentheses. Unless it is operand for # or ##.