Question

我似乎对我的代码遇到的问题是for循环似乎没有在正确的时间中断。我们的想法是，当数组中的所有值都大于零时，for循环就会中断。问题是不会发生中断。这是我的代码。

#include<stdio.h>

int randomInt(int max)
 {
  return (random(2)%max);
 }

main()
 {
  int i,k=0,j;
  int position=1,r=1; /*Position indicates the position of the particle
                        and r represents where the particle will move
                        next*/ 
  int seed,L=10,M=20;/*L is the number of sites and M is the number of hops*/
  float n,sum=0;
  float average;

  int frequency[M]; 
  for(i=0;i<(M);i++)
   {
    frequency[i]=0;
   }
  //setup the random seed generator
  printf("\nEnter your value of seed\n");
  scanf("%d",&seed);
  srandom(seed); 

  for(i=0;i<M;i++) //This loops around the total number of loops.
   {

      printf("\nThe particle is at position %d\n",position);
      n=randomInt(2);/*This chooses either the numbers 0 or 1 randomly */

      frequency[position]=frequency[position]+1;
      printf("This position has been visited %d times\n",frequency[position]);

      sum=sum+frequency[position];

      /*Below represents the conditions which will determine the movement
        of the particle*/              
        if(n==0)
         {
           r=1;
         }
        if(n==1)
         {
           r=-1;
         }
        position = position + r;
        if(position==0)
         {
          position=L;
         }

        if(position==L+1)
         {
          position=1;
         }

        //This 'for' loop below is used to check if all the sites have been visited.

        for(j=0;j<(L-1);j++) 
         {
          if(frequency[j]==0)
           {
            k++;
           }  
         }

        if(k==0)
         {
          break;
         }
        if(k!=0)
         {
          k=0;
         }

      }
    printf("\nThe particle hopped %d times when it visited every site\n",i);

    printf("\nThe total frequency of hops is %.lf\n",sum);
    average=sum/i;
    printf("\nAverage number of hops made when all the sites have been visited %.2lf\n",average);
}

Answer 1

那是因为你只是退出内部嵌套的for循环。两者中break的最佳方法是设置一些bool标志，在从内循环中断开时将其设置为true，然后检查外部条件：

bool flag = false;

然后在内心：

flag = true;
break;

然后在外面：

if(flag) break;

编辑：

如果我误解了，你只想打破内心，它发生的原因也可能是你在每次更大的迭代后都没有将你的k重置为零，所以如果下一个数组是零的话只有k仍然具有旧值，并且最终永远不会保留0。

无法使用数组关闭'for'循环

1 个答案: