m4.cpp:5: warning: missing braces around initializer for 'char [2]' m4.cpp:5: warning: missing braces around initializer for 'char [2]' m4.cpp: In function 'int main()': m4.cpp:112: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result m4.cpp:113: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result m4.cpp:114: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result m4.cpp:117: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result