Compilare: user.cpp: In function ‘void adauga(char*)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(sir);++i) ^ user.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==strlen(sir)-1) ^ user.cpp: In function ‘void sterge(char*)’: user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(sir);++i) ^ user.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==strlen(sir)-1) ^ user.cpp: In function ‘int numara_aparitii(char*)’: user.cpp:69:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(sir);++i) ^ user.cpp:74:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==strlen(sir)-1) ^ user.cpp: In function ‘int numara_prefix(char*)’: user.cpp:84:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(sir);++i) ^ user.cpp: In function ‘int numara_aparitii(char*)’: user.cpp:77:1: warning: control reaches end of non-void function [-Wreturn-type] } ^