milespergallon.cpp

来自「C++大学简明教程,解压就行没有密码。希望对大家有用」· C++ 代码 · 共 58 行

// Exercise 20.11: MilesPerGallon.cpp
// Calculates miles per gallon based on user input.
#include <iostream> // required to perform C++ stream I/O
#include <iomanip>  // required for parameterized stream manipulators
#include <string>   // required to access string functions
#include <exception> // required to use exceptions
#include <stdexcept> // required for out_of_range exception

using namespace std; // for accessing C++ Standard Library members

// function prototype
double milesPerGallon( double, double );

// function main begins program execution
int main()
{
   // define variables
   double miles;   // stores miles driven
   double gallons; // stores gallons consumed

   // prompt user for and input miles driven
   cout << "\nEnter miles driven: ";
   cin >> miles;

   // prompt user for and input gallons used
   cout << "Enter gallons used: ";
   cin >> gallons;

   // calculate and display miles per gallon
   cout << "\nMiles per gallon: " << fixed << setprecision( 2 )
        << milesPerGallon( miles, gallons ) << endl << endl;

   return 0; // indicate that program ended successfully

} // end function main

// calculate and return miles per gallon
double milesPerGallon( double milesDriven, double gallonsUsed )
{
   return milesDriven / gallonsUsed;

} // end function milesPerGallon


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