Compilare: user.cpp: In function ‘void prefix()’: user.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=strlen(A+1);i++) ^ user.cpp: In function ‘int main()’: user.cpp:39:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=strlen(B+1);i++) ^ user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nod==strlen(A+1)) ^