Compilare: user.cpp: In function ‘bool palindrom(char*)’: user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s)/2;i++) ^ user.cpp: In function ‘void afis()’: user.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=strlen(s1)+strlen(s2); i++) ^ user.cpp: In function ‘void bkt(int)’: user.cpp:74:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p==strlen(s1)-1) ^