windows.cpp: In function 'int inchid(int, int)': windows.cpp:14: warning: suggest explicit braces to avoid ambiguous 'else' windows.cpp: In function 'int main()': windows.cpp:32: warning: unused variable 'cate' windows.cpp:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result windows.cpp:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result windows.cpp:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result windows.cpp:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result windows.cpp: In function 'int inchid(int, int)': windows.cpp:30: warning: control reaches end of non-void function