Compilare: user.cpp: In function ‘int main()’: user.cpp:7:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b,c,n,i,j,l; ^ user.cpp:7:13: warning: unused variable ‘c’ [-Wunused-variable] int a,b,c,n,i,j,l; ^ user.cpp:7:15: warning: unused variable ‘n’ [-Wunused-variable] int a,b,c,n,i,j,l; ^ user.cpp:7:17: warning: unused variable ‘i’ [-Wunused-variable] int a,b,c,n,i,j,l; ^ user.cpp:7:19: warning: unused variable ‘j’ [-Wunused-variable] int a,b,c,n,i,j,l; ^ user.cpp:7:21: warning: unused variable ‘l’ [-Wunused-variable] int a,b,c,n,i,j,l; ^