这个malloc这一项为什么sizeof是4哇

Question

 char str[] = "world"; cout << sizeof(str) << ": ";//6
    char *p    = str;     cout << sizeof(p) << ": ";//4
    char i     = 10;      cout << sizeof(i) << ": ";//1
    void *pp   = malloc(10);  cout << sizeof(p) << endl;//4

void *pp = malloc(10); cout << sizeof(p) << endl;//4为什么是4

Answer 1

因为p是int 是个地址数