Definitions of global variables

global_a.c

#include <stdio.h>

void f(void);

int x = 15213;
int y = 15212;

int main() {
    printf("x = 0x%x y = 0x%x\n", x, y);
    f();
    printf("x = 0x%x y = 0x%x\n", x, y);

    return 0;
}

global_b.c

double x;

void f(void) {
    x = -0.0;
}