Compilare: user.cpp: In function ‘void Search(char*)’: user.cpp:43:27: warning: unused variable ‘res’ [-Wunused-variable] { int i,num,len=strlen(s),res; ^ user.cpp: In function ‘void Prefix(char*)’: user.cpp:58:27: warning: unused variable ‘res’ [-Wunused-variable] { int i,num,len=strlen(s),res; ^ user.cpp: In function ‘int main()’: user.cpp:72:23: warning: unused variable ‘ch’ [-Wunused-variable] { int t; char sir[25],ch[10]; ^