Difference between exit return (2) and exitreturn

Difference between exit return (2) and exitreturn
1. return returns the function value, which is a keyword; exit is a function.
2. return indicates the language level, which indicates the return of the call stack, and exit indicates the system call level, which indicates the end of a process.
3. return indicates the exit of the function (return); exit indicates the exit of the process.
4. return is provided in C language, and exit is provided by the operating system (or provided in the function library ). Exit is a library function. exit (1) indicates to exit the program after an error occurs, and exit (0) indicates to exit normally.