为什么第一个sample出的结果正确,第二个却错了,附上程序请高手指点
#include"stdio.h"
#include"math.h"
#define M 10000
#define N 7

float lean(int a,int b,int c,int d)
{
 float k;
  if(a-b!=0)
   k=(float)(c-d)/(a-b);
  else
   k=M;
  return k;
}

int distant(int a,int b,int c,int d)
{
 int dist;
 dist=(a-b)*(a-b)+(c-d)*(c-d);
 return dist;
}

main()
{
 int x[N]={-2,8,5,1,4,2,9},y[N]={-1,9,7,1,8,0,8};
 float k[N][N];
 int d[N][N];
 int i,j,m,n;
 int flag=0; clrscr();

 for(i=0;i<N;i++)
  for(j=0;j<N;j++)
  if(j!=i){
   {
     d[i][j]=distant(x[i],x[j],y[i],y[j]);
     k[i][j]=lean(x[i],x[j],y[i],y[j]);
     printf("%d\t",d[i][j]);
     printf("%f\n",k[i][j]);
     printf("%d,%d\n",i,j);  

	for(m=0;m<N;m++)
        if(m!=i&&m!=j){
         {
	  for(n=0;n<N;n++)
           if(n!=m&&n!=i&&n!=j){
	    {
             d[m][n]=distant(x[m],x[n],y[m],y[n]);
	    /* printf("%d\n",d[m][n]); */
		if(d[m][n]==d[i][j])
		  { k[m][n]=lean(x[m],x[n],y[m],y[n]);
		   /*  printf("%f\n",k[m][n]);
		     printf("%d,%d,%d,%d\n",i,j,m,n);*/
			if(k[m][n]==k[i][j])
			  {
			    k[m][i]=lean(x[m],x[i],y[m],y[i]);
                            k[m][j]=lean(x[m],x[j],y[m],y[j]);
		            k[n][i]=lean(x[n],x[i],y[n],y[i]);
		            k[n][j]=lean(x[n],x[j],y[n],y[j]);

                           if(k[m][i]==k[m][j]&&k[m][j]==k[n][i]&&k[n][i]==k[n][j]&&k[n][j]==k[m][i])
			     printf("The four points are in a line!\n");
			   else
			     flag++;
			  }
		  }
            }
          }}}}
   }
   printf("\n");
   printf("%d\n",flag);
   getchar();
}

• 自己调试吧,这比过了sample还WA的程序好弄多了. (1744) xfxyjwf 2005-06-08 16:19:07