[phear]crippler

#include <iostream>using namespace std;double midPoint(double x1, double y1, double x2, double y2);int main()   {    cout << "This program will calculate the Midpoint segment" << endl;    cout << "joining any two sets of real numbers" << endl;    double x1, y1, x2, y2;    char again;    do {        cout << "\nEnter the first set.\n";        cout << "x = ";        cin >> x1;        cout << "y = ";        cin >> y1;                cout << "\nNow enter the second set.\n";        cout << "x = ";        cin >> x2;        cout << "y = ";        cin >> y2;                cout << "\nThe Midpoint segment is: " << midPoint(x1, y1, x2, y2) << endl;                cout << "\nWould you like to do another? (Y/N): ";        cin >> again;     } while (again == 'y' || again == 'Y');     /* system(" pause "); */     return 0; }double midPoint(double x1 = 0, double y1 = 0, double x2 = 0, double y2 = 0){   return (y2 - y1) / (x2 - x1);   }