= Making Calculations =
''Part of'' TutorialFundamentals
This program demonstrates getting input from the console window, making a simple calculation, and returing the output.
{{{
#!d
/*
Purpose: Calculate the area of a circle
Author: J C Calvarese
License: Public Domain
*/
import std.c.stdio; /* for scanf */
import std.stdio; /* for writef/writefln */
const double pi = 3.141592654;
void main()
{
writefln("Let's calculate the area of a circle.");
writef("What is the radius? ");
double radius;
scanf("%lf", &radius);
double area;
area = pi * radius * radius;
writefln("Area: %s", area);
}
}}}
When you run it, the console screen should look something like this (if you provide a radius of 5):
{{{
Let's calculate the area of a circle.
What is the radius? 5
Area: 78.5398
}}}