画线条

 1 #include<graphics.h>
 2 #include<conio.h>
 3 int main()
 4 {
 5     initgraph(640,480);
 6     for(int y=100;y<=300;)
 7     {
 8         if(y/10%2==1)
 9         setcolor(RGB(0,0,255));
10         else
11         setcolor(RGB(255,0,0));
12         line(100,y,300,y);
13         y+=10;
14     }
15     getch();
16   closegraph();
17 }