解一元二次方程的东西

#include <windows.h> #include <math.h> #include <stdio.h> #include"resource.h" #define wintopX 30 #define wintopY 50 #define winHigh 400 #define winWide 300 HINSTANCE hInst; //求一元二次方程的根，函数返回根的个数 int GetRoot(float a,float b,float c,double *root) { double delta,deltasqrt; delta=b*b-4*a*c; //In the Select project configuration(s) to modify dialog box that appears, click the check boxes for all Release versions if(delta<0.0)return 0; deltasqrt=sqrt(delta); if(a!=0.0) { root[0]=(-b+deltasqrt)/(2.0*a); root[1]=(-b-deltasqrt)/(2.0*a); } else if(b!=0.0)root[0]=root[1]=-c/b; else return 0; if(root[0]==root[1])return 1; else return 2; } char strResultDown[80],strResultTop[30],strtop[30],strdown[80]; LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWND hwnd; MSG msg; WNDCLASSEX wndclass; char wname[10]="HelloWin"; wndclass.cbSize = sizeof(WNDCLASSEX); wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = (WNDPROC)WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = wname; wndclass.hIconSm = wndclass.hIcon; hInst=hInstance; if(!RegisterClassEx(&wndclass)) {MessageBox(NULL,"窗口注册失败!","HelloWin",0); return 0; } //__________________________________________ hwnd = CreateWindow(wname, "计算二元一次方程的小东西---NBSKY", WS_SYSMENU,wintopX, wintopY, winWide, winHigh, NULL, NULL, hInstance, NULL); //_______________________________________ if(!hwnd) {MessageBox(NULL,"窗口生成失败!","HelloWin",0); return 0; } ShowWindow(hwnd, nCmdShow); UpdateWindow(hwnd); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; int i,j; static HWND hwndButton,hwndEdit[3],ClearButton; char strEdit[80]; float a[3]; for(i=0;i<3;i++) { a[i]=0; } //初始显示 if(strResultTop[0]==NULL) { strcpy(strResultTop,"您欲求解的方程为："); sprintf(strResultDown,"%f*x*x+%f* x+%f=0",a[0],a[1],a[2]); } //************END**** double root[2]; switch (message) { case WM_CREATE: hwndEdit[0]=CreateWindow("edit",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER, 20, 70, 70, 25, hwnd, NULL, NULL, NULL); hwndEdit[1]=CreateWindow("edit",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER, 110, 70, 70, 25, hwnd, NULL, NULL, NULL); hwndEdit[2]=CreateWindow("edit",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER, 200, 70, 70, 25, hwnd, NULL, NULL, NULL); hwndButton=CreateWindow("button","计算结果", WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, 40, 250, 80, 25, hwnd, NULL, NULL, NULL); ClearButton=CreateWindow("button","复位", WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, 160, 250, 80, 25, hwnd, NULL, NULL, NULL); return 0; case WM_COMMAND: //*******显示提示及纠错********************************************* if(((HWND)lParam==hwndEdit[0]||(HWND)lParam==hwndEdit[1]||(HWND)lParam==hwndEdit[2]) &&(HIWORD(wParam)==EN_UPDATE)) { //清除上次结果 strcpy(strdown," "); strcpy(strtop," "); for(i=0;i<3;i++) { j=0; GetWindowText(hwndEdit[i],strEdit,80); while(strEdit[j]!=NULL) { if((strEdit[j]<'0'||strEdit[j]>'9')&&strEdit[0]!='-'&&strEdit[j]!='.') { MessageBox(hwnd,"只能输入0-9的数字和负号及小数点","警告",MB_OK); strEdit[j]=NULL; SetWindowText(hwndEdit[i],strEdit); break; } j++; } a[i]=(float)atof(strEdit); } strcpy(strResultTop,"您欲求解的方程为："); sprintf(strResultDown,"%f*x*x+%f* x+%f=0",a[0],a[1],a[2]); InvalidateRect(hwnd,NULL,TRUE); } //*************复位操作************************** if(((HWND)lParam==ClearButton)&&(HIWORD(wParam)==BN_CLICKED)) { for(i=0;i<3;i++) { SetWindowText(hwndEdit[i],NULL); a[i]=0; } strcpy(strdown," "); strcpy(strtop," "); InvalidateRect(hwnd,NULL,TRUE); } //**********************end if(((HWND)lParam==hwndButton)&&(HIWORD(wParam)==BN_CLICKED)) { for(i=0;i<3;i++) { GetWindowText(hwndEdit[i],strEdit,80); a[i]=(float)atof(strEdit); } int n=GetRoot(a[0],a[1],a[2],root); if(n<1)strcpy(strtop,"输入错误，方程无根！请重新输入..."); else { strcpy(strtop,"方程的解为："); sprintf(strdown,"x1=%f , x2=%f",root[0],root[1]); } InvalidateRect(hwnd,NULL,TRUE); } case WM_PAINT: hdc = BeginPaint(hwnd, &ps); //___________划线框架与图片____________________ HPEN newPen; newPen=CreatePen(PS_DOT, 1, RGB(0, 0, 0)); //oldPen=SelectObject(hdc, GetStockObject(NULL_PEN));//保存当前画笔,为何报错??? RoundRect(hdc,5,5,290,360,8,8);//画框 HBITMAP hBitmap; //位图句柄 HDC hDC; //将图象调入内存 hBitmap= LoadBitmap(hInst,MAKEINTRESOURCE(IDB_BITMAP1)); hDC=CreateCompatibleDC(hdc); SelectObject( hDC, hBitmap); BitBlt(hdc, 45, 300, 300, 150, hDC, 0, 0, SRCAND);//可以透明贴图 DeleteDC(hDC); DeleteObject(hBitmap); // SelectObject(hdc, newPen); MoveToEx(hdc,15,180 , NULL); LineTo(hdc, 280, 180); MoveToEx(hdc,15,240 , NULL); LineTo(hdc, 280, 240); MoveToEx(hdc,15,280 , NULL); LineTo(hdc, 280, 280); DeleteObject(newPen); //______________end___________________ TextOut(hdc,20,20,"请输入一元二次方程的系数:",25); SetTextColor(hdc,RGB(000,000,000)); TextOut(hdc,20,51,"a",1); TextOut(hdc,110,51,"b",1); TextOut(hdc,200,51,"c",1); TextOut(hdc,10,150,strResultDown,strlen(strResultDown)); TextOut(hdc,10,120,strResultTop,strlen(strResultTop)); //设置文本颜色(报错信息 ) SetTextColor(hdc,RGB(220,20,60)); TextOut(hdc,10,190,strtop,strlen(strtop)); TextOut(hdc,50,220,strdown,strlen(strdown)); //还原色彩和字体 SetTextColor(hdc,RGB(000,000,000)); EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd,message,wParam,lParam); }