Compilare: user.cpp: In function ‘int main()’: user.cpp:8:22: warning: unused variable ‘i_c’ [-Wunused-variable] int i, j, base = 0, i_c = 0, j_c = 0, a_i = 0, a_j = 0, k = 4; ^ user.cpp:8:31: warning: unused variable ‘j_c’ [-Wunused-variable] int i, j, base = 0, i_c = 0, j_c = 0, a_i = 0, a_j = 0, k = 4; ^