Volume Calculation
A floating point calculation
#include <iostream> using namespace std; /* * This program takes a volume in gallons and converts the quantity to several * other volume units, finally liters. */ int main() { // Ask for the quantity. cout << "Please enter a volume in gallons: "; double gal; cin >> gal; // A gallon is defined as 231 cubic inches. So let's convert. double cuin = 231*gal; cout << gal << " = " << cuin << " cubic inches." << endl; // An inch is defined as 2.54 centimeters. So on we go. double cm_per_in = 2.54; // Centemeters per inch. double cc = cuin * cm_per_in * cm_per_in * cm_per_in; cout << " = " << cc << " cubic centimeters." << endl; // A cc is the same as a ml, so we can get liters. cout << " = " << cc / 1000.0 << " liters." << endl; }
This program does some simple calculation. The declaration of variables as double, and assignment statements using them are familiar from Java. Likewise the use of floating-point constants.