enigma.cpp: In function 'int main()': enigma.cpp:113: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result enigma.cpp:114: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result enigma.cpp:116: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result enigma.cpp:117: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result enigma.cpp:118: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result enigma.cpp:121: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result enigma.cpp:123: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result /tmp/ccOUsSfa.o: In function `main': enigma.cpp:(.text+0xd5): warning: the `gets' function is dangerous and should not be used.