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#include<windows.h>
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#include<math.h>
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#include<stdio.h>
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int GetRoot(float a,float b,float c,double *root){
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double delta,deltasqrt;
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delta = b * b - 4.0 * a * c;
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if(delta < 0.0) return 0;
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deltasqrt = sqrt(delta);
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if(a != 0){
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root[0] = (-b + deltasqrt)/(2.0 * a);
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root[1] = (-b - deltasqrt)/(2.0 * a);
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}else{
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if(b != 0.0) root[0] = root[1] = -c/b;
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else return 0;
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if(root[0] == root[1]) return 1;
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else return 2;
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}
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}
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char str[80];
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LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
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int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nCmdShow){
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HWND hwnd;
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MSG msg;
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WNDCLASS wndclass;
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wndclass.style = CS_HREDRAW|CS_VREDRAW;
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wndclass.lpfnWndProc = WndProc;
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wndclass.cbClsExtra = 0;
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wndclass.cbWndExtra = 0;
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wndclass.hInstance = hInstance;
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wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
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wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
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wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
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wndclass.lpszMenuName = NULL;
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wndclass.lpszClassName = "SDKWin";
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if(!RegisterClass(&wndclass)){
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MessageBox(NULL,"REGISTER FAILSED!","HELLO WIN?",0);
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return 0;
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}
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hwnd = CreateWindow("SDKWin",
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"1.2.1--Windows API",
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WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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NULL,
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NULL,
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hInstance,
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NULL);
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ShowWindow(hwnd,nCmdShow);
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UpdateWindow(hwnd);
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while(GetMessage(&msg,NULL,0,0)){
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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return msg.wParam;
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}
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LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam){
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HDC hdc;
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PAINTSTRUCT ps;
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static HWND hwndButton,hwndEdit;
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char strEdit[80],strA[3][80],strHint[80];
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float a[3];
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double root[2];
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int i,j,k,m;
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switch(message){
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case WM_CREATE:
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hwndEdit = CreateWindow("edit",NULL,WS_CHILD|WS_VISIBLE|WS_BORDER,10,60,200,25,hwnd,NULL,NULL,NULL);
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hwndButton = CreateWindow("button","<EFBFBD>ⷽ<EFBFBD><EFBFBD>",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,240,60,80,25,hwnd,NULL,NULL,NULL);
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return 0;
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case WM_COMMAND:
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if(((HWND)lParam==hwndButton)&&(HIWORD(wParam) == BN_CLICKED)){
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GetWindowText(hwndEdit,strEdit,80);
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k = 0;m = 0;
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for(j = 0;j < 80;j++){
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if(strEdit[j] == ','){
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k++;m = 0;
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}
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else{
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strA[k][m] = strEdit[j];m++;
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}
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}
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for(i = 0;i < 3;i++){
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a[i] = (float)atof(strA[i]);
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}
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int n = GetRoot(a[0],a[1],a[2],root);
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if(n < 1) strcpy(str,"<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>");
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else sprintf(str,"<EFBFBD><EFBFBD><EFBFBD>̽<EFBFBD>Ϊ<EFBFBD><EFBFBD>%f,%f",root[0],root[1]);
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InvalidateRect(hwnd,NULL,TRUE);
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}
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case WM_PAINT:
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hdc = BeginPaint(hwnd,&ps);
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strcpy(strHint,"input<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><EFBFBD>̵<EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>м䶺<EFBFBD>ŷָ<EFBFBD>");
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TextOut(hdc,10,40,strHint,strlen(strHint));
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TextOut(hdc,10,90,str,strlen(str));
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EndPaint(hwnd,&ps);
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return 0;
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case WM_DESTROY:
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PostQuitMessage(0);
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return 0;
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}
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return DefWindowProc(hwnd,message,wParam,lParam);
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} |
