C + + window design attempt

First, problem: find the root of the equation ax2+bx+c=0 two times. The value of A,b,c is entered at run time by the keyboard.

You can write the following program to complete the solution:

[CPP]View Plaincopyprint?

2. #include <iostream>   
4. #include <cmath>   
6. UsingNamespace std;
8. int Main ()
10. {
12. float a,b,c,x1,x2;
14. cin>>a>>b>>c;
16. if ((b*b-4*a*c) >=0)
18. {
20. if((b*b-4*a*c) >0)
22. {
24. X1= (-b+sqrt (B*b-4*a*c))/(2*A);
26. X2= (-b-sqrt (B*b-4*a*c))/(2*A);
28. cout<< "Two unequal real roots, respectively: x1=" <<x1<< "," "x2="  <<x2<<endl;
30. }
32. Else
34. {
36. x1=-b/(2*a);
38. cout<< "Two equal real roots, x1=x2="  <<x1<<endl;
40. }
42. }
44. Else
46. cout<< "Equation without real roots"  <<endl;
48. return 0;
50. }

#include <iostream> #include <cmath>       usingnamespace std;int Main () {             float  a,b,c,x1,x2;             cin>>a>>b>>c;             if ((b*b-4*a*c) >=0)             {                 if ((b*b-4*a*c) >0)                   {                            x1= (-b+sqrt (B*b-4*a*c))/(2*a);                           X2= (-b-sqrt (B*b-4*a*c))/(2*a);                            cout<< "Two unequal real roots are: x1=" <<x1<< "," "X2=" <<x2<<endl;                   }                   else                   {                            x1=-b/(2*a);                            cout<< "Two equal real roots, x1=x2=" <<x1<<endl;                   }             else                   cout<< "equation no real Roots" <<endl;             

　Second, the development of Windows version of the program

Started my own window,

It is important to associate

Here is the graphical interface:

Key code:

void Cmy321dlg::onbutton1 () {//Todo:add your control notification handler code heredouble Delat; UpdateData ();d elat=m_b*m_b-4*m_a*m_c;if (delat>=0) {m_x1= (-m_b+sqrt (Delat))/(2*m_a);          M_x2= (-m_b-sqrt (Delat))/(2*m_a);}        Elsemessagebox ("Equation without real roots"); UpdateData (FALSE);}

Knowledge point application and experience:

This knowledge point is only now complete, found himself also pretty rotten.

C + + window design attempt