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I have learned that those global variables that will not be used outside the file should be made non-global variable by appending static keyword like static int a;

I want to know that why we should do this?

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  • You can't accidentally use it in another file. Commented Dec 27, 2019 at 11:41
  • @user253751 So for only this purpose, we make non-global variables? Commented Dec 27, 2019 at 12:17

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Static implies a translation unit level scope only.

However, you don't need to make it non-global + static.

You can very well make it global static to curb the scope to translation unit level.

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Translation unit* scope. Not file scope.

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