此代码在第 6 行抛出错误。是因为 cout 流不允许它还是在 ostream 中有一些冲突?

This code throws an error at line 6. Is it because cout stream doesn't allow it or it's some conflict in ostream?

#include<iostream>
using namespace std;

int main() {
   int a=4,b;
   cout<<b=a*a;
   return 0;
}

显示

"error: no match for 'operator=' (operand types are 'std::basic_ostream<char>' and 'char')"

如果它必须对 cout 做些什么,谁能告诉我 cin 和 cout 是如何工作的?

运算符优先级见此处:https://en.cppreference.com/w/cpp/language/operator_precedence

<< 排名 7。= 排名 16。* 排名 5。因此该行被解析为

(std::cout << b ) = (a * a);

您不能将 int 分配给 std::cout。改为这样写:

int a = 4;
int b = a*a;
std::cout << b;