code. compile. run. debug. share.
/******************************************************************************
Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
*******************************************************************************/
#include <iostream>
#include <math.h>
int main ()
{
double A;
double R;
char buffer[50] = { };
std::cout << "Enter a number >> "; std::cin >> R;
A = 3.141519 * R * R;
sprintf (buffer, "A = %.4f\n", A);
std::cout << buffer;
return 0;
}
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