【深入理解C++】给表达式赋值

在 C 语言中表达式是不可以被赋值的，但是在 C++ 中可以。

#include <iostream>
using namespace std;

int main()
{
    int a = 10;
    int b = 20;
    a = b = 100;
    cout << "a = " << a << ", b = " << b << endl; // a = 100, b = 100

    return 0;
}

#include <iostream>
using namespace std;

int main() {
	int a = 1;
	int b = 2;
	(a = b) = 4;
	cout << "a = " << a << ", b = " << b << endl; // a = 4, b = 2
	
	return 0;
}

#include <iostream>
using namespace std;

int main() {
	int a = 1;
	int b = 2;
	(a > b ? a : b) = 4;
	cout << "a = " << a << ", b = " << b << endl; // a = 1, b = 4
	
	return 0;
}