(cin >> int x ) showing error. why can't declare variable after cin

Question

A very short program

#include <iostream>
using namespace std;

int main()
{
    cin>> int x;

    return 0;
}

it's not compiling, why can't declare after cin?

For these are the rules. First declare, then use. Assuming you can, what is the scope of the variable? — zdf, Mar 13 '21 at 11:51
https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list — πάντα ῥεῖ, Mar 13 '21 at 11:55
`>>` is a function. After the function call, the variable will cease to exist. — zdf, Mar 13 '21 at 12:03

score 1 · Answer 1 · answered Mar 14 '21 at 17:55

1

You first have to declare a variable before using it. Or in other words: Variables have to be in scope when using them. That's the way it works in C++.

answered Mar 14 '21 at 17:55

Striezel

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score 0 · Answer 2 · edited Mar 14 '21 at 18:32

cin is the object in c++ of class istream. It is Used to accept the input from input devices like keyboard and int x; is declaration of variable i.e. allocating the space where our number from input stream will get stored.>> is extraction operator which receives the stream.So declaration and taking input are 2 different things. 1) allocate memory(int x)2)write into it. These 2 things won't happen together.

(cin >> int x ) showing error. why can't declare variable after cin

2 Answers2