prodmax.cpp: In function 'int main()': prodmax.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result prodmax.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result prodmax.cpp:13: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result prodmax.cpp:11: warning: 'x' may be used uninitialized in this function prodmax.cpp:11: warning: 'y' may be used uninitialized in this function /tmp/ccR4jLgm.o: In function `main': prodmax.cpp:(.text+0x56): warning: the `gets' function is dangerous and should not be used.