ham.cpp: In function 'int valid(int)': ham.cpp:54: warning: array subscript has type 'char' ham.cpp:56: warning: array subscript has type 'char' ham.cpp:57: warning: array subscript has type 'char' ham.cpp: In function 'int main()': ham.cpp:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ham.cpp:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ham.cpp:96: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ham.cpp:99: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result