Distance source code

This snippet submitted by prog-bman on 2005-01-26. It has been viewed 32508 times.
Rating of 5.6 with 239 votes

#include <iostream>
#include <cmath>
#include <string>
 
/*
This program takes 2 x,y coords and calculates the distance between them.
I wrote this cause I was getting tired of doing the math on paper for my 
college algebra class :). 
There is no input validation but I'll leave that up to anyone who wants to use it.
*/

void getValues(double &x, double &x1, double &y, double &y1);
void getDistance(const double x, const double x1, const double y, const double y1);

int main(void)
{
    
  double x;
  double x1;
  double y;
  double y1;
  bool exit = false;
  std::string exitletter;
  
  while(!exit)
  {
    getValues(x,x1,y,y1);
    getDistance(x,x1,y,y1);
    std::cout<<"Another? (y or n)"<<std::endl;
    std::cin>>exitletter;    
    
    if(exitletter == "n")
    {
      exit = true;
    }      
    
  } 
   
  return 0;
  
}

void getValues(double &x, double &x1, double &y, double &y1)
{
  
  std::cout<<"Enter x"<<std::endl;
  std::cin>>x;
  std::cout<<"Enter y"<<std::endl;
  std::cin>>y;
  std::cout<<"Enter x2"<<std::endl;
  std::cin>>x1;
  std::cout<<"Enter y2"<<std::endl;
  std::cin>>y1;
  
}

void getDistance(const double x, const double x1, const double y, const double y1)
{
  
  double distance;
  double preSqrtValue;
  preSqrtValue = ( pow( (x1 - x), 2) + pow( (y1 - y), 2) );
  distance = sqrt( ( pow( (x1 - x), 2) + pow( (y1 - y), 2) ) );
  std::cout<<"Before taking the square root "<<preSqrtValue<<std::endl;
  std::cout<<"Distance equals "<<distance<<std::endl;
  
}

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