#include <stdio.h>

int x=0;
int y=0;

void add_k_to_xy(int k, int z)
{
int x=0;
x = x + k;
y = y + k;
z = z + k;
}int main()
{
int z=0;
x = x + 3;
y = y + 3;
z = z + 3;
printf("x:%d y:%d z:%d¥n"

, x,y,z);

add_k_to_xy(3,z);
printf("x:%d y:%d z:%d¥n"

, x,y,z);

add_k_to_xy(3,x);
printf("x:%d y:%d z:%d¥n"

, x,y,z);

add_k_to_xy(3,y);
printf("x:%d y:%d z:%d¥n"

, x,y,z);

return 0;
}