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:23:27: warning: unused variable ‘r’ [-Wunused-variable] int c=0,d=strlen(a+1),r=0,e=strlen(b+1); ^