How to take input from users?

I am making a circumference finder program by multiplying the diameter of circle with PI. But I want to take the input of diameter from the user. Can you figure out how to do that? Also, I want the answer as a float or double (I mean with decimalS) but answer comes in integer (without decimals) form.

Code -

 ``123456789101112131415`` ``````#include using namespace std; int main() { const double PI = 22/7; cout<<"Circle Circumference Finder!"<< endl; cout<<"Plz enter the diameter of the circle"<< endl; // Consider the input value as x cout<<"The circumference of the circle is: "<<(PI * x) << endl; return 0; }``````
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On line 7, you are doing an integer division, which rounds out the remainder before PI recieves it. Its better normally to just define PI in the normal way (i.e., `const double PI = 3.1415926535897932` or something like that). Also, to input, just make a `double` x and use std::cin to input into the variable, and then you can multiply them together.
 ``1234`` ``````double x; cout << "Plz enter the diameter of the square: " cin >> x; cout << endl;``````

http://www.cplusplus.com/doc/tutorial/basic_io/

Also, so the output is integer, you can simply cast to int.
 ``12`` ``````double result = PI * x; cout << "The circumference of the circle is: "<< (int)result << endl;``````
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Oh yes it works. Thanks!

Cheers >>
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