kpal.cpp: In function 'int main()': kpal.cpp:10: warning: unused variable 'j' kpal.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kpal.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kpal.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result kpal.cpp:12: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cclbhra1.o: In function `main': kpal.cpp:(.text+0x6a): warning: the `gets' function is dangerous and should not be used.