[Solved] Warning given and i can not understand why after about 10 minutes of research so i am asking

by


The statement

return("Option %c is not supported",'k');

is the same as

return('k');

since the expression "Option %c is not supported" has no side effect.

Given that the return type of the function is FILE*, 

return('k');

is a problem since 'k' is not of type FILE*.

It seems you are not sure what you are doing. Perhaps a good tutorial will be useful.

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solved Warning given and i can not understand why after about 10 minutes of research so i am asking