chimie.cpp: In function 'int compus(char, int, int, char*, int (*)[30])': chimie.cpp:54: warning: operation on 'top' may be undefined chimie.cpp: In function 'int main()': chimie.cpp:103: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result chimie.cpp:104: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result chimie.cpp:107: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result chimie.cpp:108: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result chimie.cpp:113: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cc9A3MSd.o: In function `main': chimie.cpp:(.text+0x41e): warning: the `gets' function is dangerous and should not be used.