#include<iostream>
using namespace std;
int main() {
int a=4,b;
cout<<b=a*a;
return 0;
}
它显示
"error: no match for 'operator=' (operand types are 'std::basic_ostream<char>' and 'char')"
如果它必须与cout有关,有人能告诉我cin和cout究竟是如何工作的吗?
查看操作符优先级:https://en.cppreference.com/w/cpp/language/operator_precedence.
<<
为第7位。=
排在第16位。*
排在第5位。因此这一行被解析为
(std::cout << b ) = (a * a);
不能将int
分配给std::cout
。改成这样:
int a = 4;
int b = a*a;
std::cout << b;