Compilare: user.cpp: In function ‘void strmatch()’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=strlen(a+1);++i) ^ user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1,c=0;i<=strlen(b+1);++i) ^ user.cpp:18:27: warning: unused variable ‘r’ [-Wunused-variable] int c=0,d=strlen(a+1),r=0; ^