[觀點][C語言]重新定義一樣的變數名稱，觀察其值的改變

#include <stdio.h>
#include <stdlib.h>

void foo(int* x)
{
    x = (int*)malloc(sizeof(int));
    *x = 12;
}

int main()
{
    int x = 10;
    foo(&x);
    printf("x = %d\n", x);
    return 0;
}

[Answer]
a = 7 b = 13
a = 7