Please note that you can use any integer here. Also note that zero is used here by convention to show that the program completed successfully (i.e., without any errors). Different numbers can be used to indicate different types of error conditions that occur,
such as divide by zero, file not found, and so on.
NOTE This exit status can be tested by other programs like the UNIX shell to see whether the program ran successfully. The end of the program is marked off by a closing brace. Remember the following programming
tips:
1.