memset

http://blog.csdn.net/songuooo/article/details/7819790

 字符指针、字符串

int main()
{
    char *s1 = "abc";//s1在栈上，"abc"在字符常量区，s3也指向这个"abc"
    char *s3 = "abc";//"abc"在栈上
    char s2[] = "abc";
    cout << &(s2[0]) << endl;//以下四条语句都是输出abc
    cout << &s1[0] << endl;
    cout << &s3[0] << endl;
    cout << s1 << endl;
    cout << strcmp(s1, s2) << endl;
    cout << (s1 == s2) << endl;//判断是否指向同一地址
    printf("%p,%p,%p", s1, s2, s3);
}