Thread: Why wont this program stay open?

Program compiles and runs no problem but closes right away when finished. Any help is much appreciated. Heres the code:

Code:

#include <iostream>
#include <cmath>

using namespace std;
double calcDistance(double,double, double, double);
float calcKilometers(float, const float) ;

int main()

{   char choice;
    
    cout << "1.Calculate distance between two points?"<< endl;
    cout<<"2.Miles to Kilometers?"<< endl;
    cin >> choice;
    
    if (choice=='1')
    { 
       double x1;
       double y1;
       double x2;
       double y2;
       
    cout << "Enter X coordinate for first point:"<< endl;
    cin >> x1;
    cout << "Enter Y coordiante for first point:"<<endl;
    cin >> y1;
    cout << "Enter X coordinate for second point:"<< endl;
    cin >> x2;
    cout << "Enter Y coordiante for second point:"<<endl;
    cin >> y2;
    
  cout << "The distance between those points is " <<calcDistance(x1,y1,x2,y2)<<endl;
       return;
    }
    
    else if (choice=='2')
    { 
      const float KMperMile= 1.609;
      float miles;
    
         
    cout << "How many miles?" << endl;
    cin >> miles;
    cout << "It is " <<calcKilometers(KMperMile,miles) << endl;
         
    return; 
}
    system("PAUSE");
    
}

double calcDistance(double x1,double y1, double x2, double y2)

{ 
       double distancee;
       
    distancee = sqrt (((x2-x1)*(x2-x1)) + ((y2-y1)*(y2-y1))) ;
    cout << "The distance between those points is " <<distancee<< endl;
        return distancee;
}


float calcKilometers(const float KMperMile,float miles)
{   
    float solution;

    solution = miles * KMperMile;
   
    return solution;
}