Compilare: user.cpp: In function ‘int main()’: user.cpp:52:14: warning: ‘col_2’ may be used uninitialized in this function [-Wmaybe-uninitialized] else if (col_1 == col_2) ^ user.cpp:47:9: warning: ‘ln_2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (ln_1 == ln_2) ^ /tmp/ccDWgViH.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.