sablon2.cpp: In function 'int main()': sablon2.cpp:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sablon2.cpp:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sablon2.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result sablon2.cpp:19: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result sablon2.cpp:23: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccpn85nT.o: In function `main': sablon2.cpp:(.text+0x6f): warning: the `gets' function is dangerous and should not be used.