Linux C程序存储空间的逻辑布局

#include "stdio.h"
#include "sys/types.h"

void f1(u_int32_t a)
{
    printf("%p\n", &a);

    u_int8_t *ap = (u_int8_t *)&a;
    while(++ap)
    {   
        printf("%p\n", ap);

        if( *ap == a)
        {   
            *ap = 7;
            break;
        }   
    }   
}

main()
{
    u_int32_t i = 123;
    printf("%p\n", &i);

    f1(i);

    printf("%d\n", i); 
}