如何在cout中添加变量？

Question

我想在 cout 中添加 float average 变量。什么是完美的方式？

int first , second , third;
cout<<"enter the first number: ";
cin>>first;
cout<<"enter the second number: ";
cin>>second;
cout<<"enter the third number: ";
cin>>third;

cout<<float average=(first+second+third)/3;

Answer 1

C++ 方式为：

float average = static_cast<float>(first + second + third) / 3.;
std::cout << average << std::endl;

Answer 2

你不能那样做。只需在打印前声明变量即可。

float average = (first + second + third) / 3;
std::cout << average;

但是，您可以做的就是根本没有变量：

std::cout << (first + second + third)/3;

另请注意，(first+second+third)/3 的结果是 int，将被截断。如果这不是您的本意，您可能想将 int first, second, third; 更改为 float first, second, third;。

Answer 3

float average=(first+second+third)/3; cout<<average 或者

cout<<((first+second+third)/3)

Answer 4

您需要先声明变量类型

你可以这样做。

int first , second , third;
cout<<"enter the first number: ";
cin>>first;
cout<<"enter the second number: ";
cin>>second;
cout<<"enter the third number: ";
cin>>third;

float average;

cout<< (average=(first+second+third)/3);

如何在cout中添加变量？

How to add variable inside the cout?

c++

variable-declaration