# URI online judge 1002 solution: Area of a Circle

## URI 1002 Problem: Program to Print Area of a Circle

URI 1002 Problem solution: In this problem, you have to write a program that takes the radius as input and print the Area of a Circle as output.

According to URI Online judge, problem 1002 is given below:
The formula to calculate the area of a circumference is defined as A = π . R2. Considering to this problem that π = 3.14159:

Calculate the area using the formula given in the problem description.

Input

The input contains a value of floating-point (double precision), that is the variable R.

Output

Present the message "A=" followed by the value of the variable, as in the example below, with four places after the decimal point. Use all double precision variables. Like all the problems, don't forget to print the end of the line after the result, otherwise, you will receive a "Presentation Error".

## URI 1002 Solution in C: Area of a Circle

Program:

[sourcecode language="c"]#include<stdio.h> int main() #define n 3.14159 { double R,A; scanf("%lf", &R); A = n * R * R; printf("A=%.4lf\n", A); return 0; }[/sourcecode]

Or

[sourcecode language="c"]#include<stdio.h> int main() { double R,A; scanf("%lf", &R); A = 3.14159 * R * R; printf("A=%.4lf\n", A); return 0; }[/sourcecode]

Test Input:

This is a test input in C: 2.00

Test Output:

This is the output of test input: A=12.5664

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