Compilare: user.cpp: In function ‘void strmatch()’: user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=strlen(a+1);++i) ^ user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(b+1);++i) ^