Dynamic initialization. : Variables « Language Basics « C++ Tutorial

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2. Language Basics
3. Variables

#include <iostream> 
using namespace std; 
  
int main() { 
  double radius = 4.0, height = 5.0; 
 
  // dynamically initializ volume 
  double volume = 3.1416 * radius * radius * height; 
 
  cout << "Volume is " << volume; 
 
  return 0; 
}

Volume is 251.328"