GCC C compiler warning "warning: control reaches..."

2018-06-26 07:30:14

This question already has an answer here:

What should main() return in C and C++? 19 answers

Your main function doesn't explicitly return anything. Just slap a return 0; at the end and you should be OK:

int main()
{
    char s1[] = "abcd";
    char s2[] = "zzzz";
    contract(s1,s2);
    return 0; /* Here! */
}

The -ansi option switches to the ISO C90 standard. Back then, the main function had to return something. Since C99, it's OK to leave out the return statement.

当使用-ansi （= C89）时，如果你不返回任何东西 - 你定义了一个非void的返回类型（int），那么你不会得到返回0的默认行为，现在你只需返回一些东西。

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