void main()
{
float i=0;
int year ,j;
int a,b;
int sum;
/*求两个数的最大公约数*/
scanf("%d",&a);
scanf("%d",&b);
/*/test of function call*/
printf("%d ",gcd(a,b));
getch();
/*
//无实际意义,测试各种情况下的变量定义的合法性
int mmm;
{int mmm;}
if(pi==3.15) int mmm;
if(pi==3.15) int mmm; else int mmm = 3;
for(a=0; a<10; a++) int mmm;
while(0) int mmm;
do int mmm; while(0);
//statements which have no use but legal
*/
;
a;
2343;
(((b)));
{}
{b;}
/*/statements which may cause errors*/
for(;0;);
for(a=0; a<10; a++);
while(0);
do ; while(0);
a=VGA,b=VGAHI;
/*/绘图,绘制辅导教材中logo程序的示例图形*/
initgraph(&a,&b,"");
xOrg = 160 + 60;
yOrg = 240;
rot = 0;
xScale = 80;
yScale = 80;
i = -pi;
x = cos(i);
y = sin(i);
CalcCoord();
moveto(x,y);
/*/for-loop without the first expression*/
for(; i<=pi+pi/50; i+=pi/50)
{
x = cos(i);
y = sin(i);
CalcCoord();
lineto(x,y);
}
i = 0;
x = (1-1/(10.0/7))*cos(i) + 1/(10.0/7)*cos(-i*((10.0/7)-1));
y = (1-1/(10.0/7))*sin(i) + 1/(10.0/7)*sin(-i*((10.0/7)-1));
CalcCoord();
moveto(x,y);
for(; i<=20*pi; i+=pi/50)
{
x = (1-1/(10.0/7))*cos(i) + 1/(10.0/7)*cos(-i*((10.0/7)-1));
y = (1-1/(10.0/7))*sin(i) + 1/(10.0/7)*sin(-i*((10.0/7)-1));
CalcCoord();
lineto(x,y);
}
xOrg = 480-60, yOrg = 240;
xScale = 80, yScale = 80/3;
j = 0;
/*/a nest of while-loop and for-loop*/
while(j<3)
{
/*/nest of if-else staments and 'if' without 'else'*/
if(j==0)
rot = pi/2 + 0*pi/3;
else if(j==1)
rot = pi/2 + 2*pi/3;
else if(j==2)
rot = pi/2 - 2*pi/3;
j++;
setcolor(j*3+1);
i = -pi;
x = cos(i);
y = sin(i);
CalcCoord();
moveto(x,y);
/*/for-loops without the first and third expression
//since there's no "break" and "goto" statement in this
//language, a for-loop without the second expression
//will be a dead-loop, it cannot be tested here*/
for(; i<=pi+pi/50;)
{
x = cos(i);
y = sin(i);
CalcCoord();
lineto(x,y);
i+=pi/50;
}
}
getch();
closegraph();
/*/print the multiplication table, test of nested for-loops
//here's two for-loops with all the three expressions*/
for(j=1; j<=9; j++)
{
int k;
for(k=1; k<=9; k++)
printf("%d*%d=%2d ",j, k, j*k);
printf("\n");
}
/*/do-while-loop
//get the sum of the numbers between 1 and 100*/
j = 0;
sum = 0;
do{
j++;
sum += j;
}while(j<100);
printf("%d ",sum);
/*/print the leap years between 2000 and 2100
//quite a complex condition justice*/
printf("\n");
for(year=2000; year<=2100; year++)
if((year%4==0 && year%100!=0) || (year%400==0))
printf("%d ",year);
}
void MainLoop(void)
{
int px = 0, py = 0, sx = 9, sy = 9, w = 0, h = 0;
int osx, osy, ow, oh;
#define INPUT_TEXT_SIZE 16
PutParts();
while (1) {
char string_length, input_text[INPUT_TEXT_SIZE];
XFlush(display);
if (input.button[2]) {
eye.x += (input.x - WINW / 2) / SCROLL_SPDIV;
eye.y += (input.y - WINH / 2) / SCROLL_SPDIV;
PutParts();
XSync(display, 0);
if (0 == XEventsQueued(display, QueuedAfterReading)) continue;
}
while (XEventsQueued(display, QueuedAfterReading) > 0) {
XNextEvent(display, &event);
switch (event.type) {
case Expose:
XCopyArea(display, scratchmap, scratch, gc,
0, 0, WINW, WINH, 0, 0);
break;
case MappingNotify:
XRefreshKeyboardMapping((XMappingEvent *)&event);
break;
case KeyPress:
string_length = XLookupString((XKeyEvent *)&event,
input_text, INPUT_TEXT_SIZE, &key, NULL);
if (1 == string_length) {
switch (input_text[0]) {
case 'q':
return;
case 'u':
eye.scale += 256;
AffineParts();
break;
case 'd':
if (eye.scale > 256) eye.scale -= 256;
AffineParts();
break;
}
PutParts();
}
break;
case MotionNotify:
if (CompressMNEvent(&event)) {
input.x = event.xmotion.x;
input.y = event.xmotion.y;
break;
}
if (scratch != event.xmotion.window) {
int rx, ry, rw, rh;
osx = sx; osy = sy;
ow = w; oh = h;
XCopyArea(display, rootmap, cutmap, gc,
osx - 9, osy - 9, ow + 10, oh + 10,
osx - 9, osy - 9);
CutRectangle(px, py, event.xmotion.x, event.xmotion.y,
&sx, &sy, &w, &h);
XSetForeground(display, gc, black);
if (CantCut(w, h)) {
XDrawRectangle(display, cutmap, gc,
sx - 1, sy - 1,
w + 1, h + 1);
XCopyArea(display, rootmap, cutmap, gc,
sx, sy, w, h, sx, sy);
} else {
XDrawRectangle(display, cutmap, gc,
sx - 9, sy - 9,
w + 1, h + 1);
DrawShadow(cutmap, sx, sy, w, h, 8);
XCopyArea(display, rootmap, cutmap, gc,
sx, sy, w, h, sx - 8, sy - 8);
}
MaxArea(&rx, &ry, &rw, &rh,
sx - 9, sy - 9, w + 10, h + 10,
osx - 9, osy - 9, ow + 10, oh + 10);
XCopyArea(display, cutmap, cut, gc,
rx, ry, rw, rh, rx, ry);
}
if (input.button[0] && NULL != in_parts_hd) {
if (RAISED == in_parts_hd->stat) {
CalcCoord(event.xmotion.x - in_parts_hd->bx,
event.xmotion.y - in_parts_hd->by,
in_parts_hd);
PutParts();
} else {
PointPart(event.xmotion.x, event.xmotion.y);
PutParts();
}
} else {
PointPart(event.xmotion.x, event.xmotion.y);
PutParts();
}
break;
case ButtonPress:
input.button[event.xbutton.button - 1] = 1;
if (1 == event.xbutton.button && scratch != event.xbutton.window) {
px = event.xbutton.x; py = event.xbutton.y;
CutMode(px, py);
break;
}
if (1 == event.xbutton.button) {
RaisePart();
PutParts();
break;
}
break;
case ButtonRelease:
input.button[event.xbutton.button - 1] = 0;
sx = sy = 9; w = h = 0;
if (1 == event.xbutton.button && scratch != event.xbutton.window) {
int sx, sy, w, h;
PARTTL *part;
XDestroyWindow(display, cut);
CutRectangle(px, py, event.xmotion.x, event.xmotion.y,
&sx, &sy, &w, &h);
if (!CantCut(w, h)) {
if (NULL == out_parts_hd) {
fputs("parts over flow.\n",
stderr);
exit(1);
}
part = out_parts_hd;
out_parts_hd = out_parts_hd->n;
part->p = NULL;
part->n = in_parts_hd;
if (NULL != in_parts_hd) {
in_parts_hd->p = part;
}
in_parts_hd = part;
part->stat = NONE;
part->x = eye.x + rand() % (WINW / 2) - WINW / 2;
part->y = eye.y + rand() % (WINH / 2) - WINH / 2;
part->w = w; part->h = h;
part->source = XCreatePixmap(display, root, w, h, depth);
XCopyArea(display, rootmap,
part->source, gc,
sx, sy, w, h, 0, 0);
{
int px = 0, py = 0;
int pw = 0, ph = 0;
;
CalcView(part, &px, &py,
&pw, &ph);
AffinePart(part, pw, ph, 1);
}
PutParts();
}
break;
}
break;
}
}
}
}
