Compilare: user.cpp: In function ‘int main()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:17:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i]!=b[j]&&i<strlen(a)) ^ user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }if(j>=strlen(b)) break; ^