subsecvente.cpp: In function `void add(int, int, int, int)': subsecvente.cpp:19: warning: comparison between signed and unsigned integer expressions subsecvente.cpp: In function `void prefix(int, int, int, int)': subsecvente.cpp:41: warning: comparison between signed and unsigned integer expressions /tmp/ccJkKYxt.o(.text+0x229): In function `main': : the `gets' function is dangerous and should not be used.