Compilare: user.cpp: In function ‘void f(float, float, float, float, float, float&, float&, float&, float&)’: user.cpp:70:8: warning: unused variable ‘rsq’ [-Wunused-variable] float rsq = r * r; ^ user.cpp: In function ‘int main()’: user.cpp:110:27: warning: unused variable ‘xc1’ [-Wunused-variable] float r, x1, y1, x2, y2, xc1, yc1, xc2, yc2; ^ user.cpp:110:32: warning: unused variable ‘yc1’ [-Wunused-variable] float r, x1, y1, x2, y2, xc1, yc1, xc2, yc2; ^ user.cpp:110:37: warning: unused variable ‘xc2’ [-Wunused-variable] float r, x1, y1, x2, y2, xc1, yc1, xc2, yc2; ^ user.cpp:110:42: warning: unused variable ‘yc2’ [-Wunused-variable] float r, x1, y1, x2, y2, xc1, yc1, xc2, yc2; ^