Compilare: user.cpp: In function ‘void cal(int, int)’: user.cpp:13:6: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:13:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void calb(int, int)’: user.cpp:32:6: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:32:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void calc(int, int)’: user.cpp:49:6: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:49:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:67:12: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int i,j,k,l,xi,xf; ^