Compilare: user.cpp: In function ‘int main()’: user.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=strlen(sir1+1);i++) ^ user.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=strlen(sir2+1);i++) ^ user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=strlen(sir1+1);i++) ^ user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1;j<=strlen(sir2+1);j++) ^