为什么不是第二个printf打印200，200 ,301？

Question

为什么不是第二个输出打印200，200 ,301？
反而在第三个打印了是为什么？第二个不是有两个运算符吗，第三个没有运算符呀

Answer 1

#include <iostream>
using namespace std;
int main()
{
    int* p;
    int a[] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
    p = a;
    cout << *p<<" "<<endl;
    cout << *p <<" "<< * ++p << endl;
    cout << *p <<"  "<< * p++ << endl;
    cout << *p<<"  "<< * (p++) <<"  " << endl;
    cout << *p << "  " << *++p << "   " << *p++ << endl;
    cout << *p << "  " << *++p << "   " << *p++ << "   " << *(p)++ << endl;
    cout << *++p <<"  " << *p++ << endl;
    cout<<*++p<<"   "<< * (p)++ << endl;
    cout<< *p++ <<"   "<< * (p)++ << endl;
    cout << * ++p << "   "<< * p++ <<"   "<< * (p)++ << endl;
}