#include <stdio.h>

static void sub(void);

int main()
{
    char a[] = "abc", *b = "def";
    char *x = a, *y = b;

    printf("%s : %s\n", x, y);
    sub();
    return 0;
}

char a[]= "ghi", *b = "jkl";
char *x = a, *y = b;

void sub()
{
    char a[] = "mno", *b = "pqr";
    char *x = a, *y = b;

    printf("%s : %s\n", x, y);
    return;
}