C++中<< 运算符的计算顺序

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#include <iostream>using namespace std;template <typename T>void swap(T &a, T &b) {    T temp(a);    a = b;    b = temp;}template <typename T>T add(const T &a, const T &b) {    return a + b;}int main(){    cout << "Hello world!" << endl;    int a = 0;    cout << a++ << a++ << a++ << endl;    char *p = "abc";    cout << *(p++) << *(p++) << *(p++) << endl;    return 0;}

2.printf中类似的用法：

#include <stdio.h>#include <stdlib.h>int main(int argc, char *argv[]){    int arr[] = {6, 7, 8, 9, 10};    int *ptr = arr;    *(ptr++) += 123; //后置++在表达式计算完成后，执行，前置的++在表达式执行之前执行；    //arr++; arr 是个右值rvalue，而++需要一个左值lvalue;    printf("%d\n", (int)&arr);    printf("%d\n", arr[0])    printf("%d, %d\n", *ptr, *(++ptr)); //printf 参数的压栈顺序，从右往左。输出 8，8；    unsigned char a = 0xA5;    unsigned char b = ~a >> 4;    printf("~a = %x \n", ~a);    printf("a = %d \n", a);    printf("b = %d \n", b);    float f = 1.0f;    printf("(int) f = %x\n", (int)f);    printf("&f = %x\n", &f);    return 0;}