error: expected declaration or statement at end of input

This error is sometimes reported in Linux programming, and it hurts a lot because the compiler doesn’t tell you exactly what went wrong…
There are several possible reasons for this error:
1) Where the program is missing a parenthesis.
The detection method is as follows. If you are programming with VIM, you can use % to match the parentheses one by one. Here is how I did it
2) the variable does not declare

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