Compilare: user.cpp: In function ‘void test()’: user.cpp:16:17: warning: unused variable ‘k’ [-Wunused-variable] int s=0,j,i,k,sum; ^ user.cpp: In function ‘int main()’: user.cpp:60:9: warning: unused variable ‘r’ [-Wunused-variable] int r=1, s, k; ^ user.cpp:60:14: warning: unused variable ‘s’ [-Wunused-variable] int r=1, s, k; ^ user.cpp:60:17: warning: unused variable ‘k’ [-Wunused-variable] int r=1, s, k; ^