rv.cpp: In function 'int main()': rv.cpp:12: warning: comparison between signed and unsigned integer expressions rv.cpp:42: warning: comparison between signed and unsigned integer expressions rv.cpp:42: warning: suggest parentheses around '&&' within '||' rv.cpp:93: warning: comparison between signed and unsigned integer expressions rv.cpp:93: warning: suggest parentheses around '&&' within '||' rv.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rv.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rv.cpp:10: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccJCnSXr.o: In function `main': rv.cpp:(.text+0x56): warning: the `gets' function is dangerous and should not be used.