金刚石

#include <graphics.h>#include <math.h>#include <stdio.h>main(){float t;int x0=400,y0=300;int n,i,j,r;int x[50],y[50];int gdriver=DETECT,gmode;initgraph(&gdriver,&gmode," ");printf("input n(23-31) and r(100-200)\n");scanf("%d%d",&n,&r);cleardevice();setbkcolor(9);setcolor(4);t=6.28318/n;for(i=0;i<n;i++){x[i]=x0+r*cos(t*i);y[i]=y0+r*sin(t*i);}/**/for(i=0;i<n-1;i++){for(j=i+1;j<n;j++)line(x[i],y[i],x[j],y[j]);}getch();closegraph();}