vocale.cpp: In function 'int main()': vocale.cpp:45: warning: comparison between signed and unsigned integer expressions vocale.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result vocale.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result vocale.cpp:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result vocale.cpp:13: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccyT5KjM.o: In function `main': vocale.cpp:(.text+0x8e): warning: the `gets' function is dangerous and should not be used.