nrpal.cpp: In function 'int main()': nrpal.cpp:39: warning: array subscript has type 'char' nrpal.cpp:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nrpal.cpp:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nrpal.cpp:36: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccIdED83.o: In function `main': nrpal.cpp:(.text+0x24b): warning: the `gets' function is dangerous and should not be used.