Compilare: user.cpp: In function ‘int vecin(int, int)’: user.cpp:44:9: warning: unused variable ‘c1’ [-Wunused-variable] int c1=0,c2=0,c3=0,c4=0; ^ user.cpp:44:14: warning: unused variable ‘c2’ [-Wunused-variable] int c1=0,c2=0,c3=0,c4=0; ^ user.cpp:44:19: warning: unused variable ‘c3’ [-Wunused-variable] int c1=0,c2=0,c3=0,c4=0; ^ user.cpp:44:24: warning: unused variable ‘c4’ [-Wunused-variable] int c1=0,c2=0,c3=0,c4=0; ^