我编写了一个代码，用于跟踪随机移动的粒子的位置。这个想法是它意味着一次移动一个位置。它移动的方向是随机的。我遇到的问题是我可以跟踪“粒子”的次数。除了一组随机数之外，它一直处于某个位置。我知道这些随机数是错误的，因为输出的数字太大或者是负数。我是编程新手，知识有限。以下是我的代码。任何帮助将不胜感激。
#include<stdio.h>
int randomInt(int max)
{
return (random(2)%max);
}
main()
{
int i;
int position=1,r=1; /*Position indicates the position of the particle
and r represents where the particle will move
next*/
int L=10,M=20;/*L is the number of sites and M is the number of hops*/
int seed,n,sum=0;
int frequency[position];
//setup the random seed generator
printf("\nEnter your value of seed\n");
scanf("%d",&seed);
srandom(seed);
printf("\nThe value of the seed is %d\n",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]);
/*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;
}
}
}
答案 0 :(得分：1)
不太清楚，但这里有一些修复你的编程：
#include<stdio.h>
#include <string.h>
int randomInt(int max)
{
return (random() % max);
}
main()
{
int i;
int position=1,r=1; /*Position indicates the position of the particle
and r represents where the particle will move
next*/
int L=10,M=20;/*L is the number of sites and M is the number of hops*/
int seed,n,sum=0;
int frequency[L];
memset(frequency, 0, sizeof(frequency));
//setup the random seed generator
printf("\nEnter your value of seed\n");
scanf("%d",&seed);
srandom(seed);
printf("\nThe value of the seed is %d\n",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]);
/*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 - 1;
}
if(position >= L)
{
position = 0;
}
}
}
答案 1 :(得分：0)
您的代码有两个问题：
frequency的长度应为L frequency 一个建议：改变测试，以防你回来并希望增加或减少超过1。
这是由gcc main.c -o main
#include<stdio.h>
#include<stdlib.h>
int randomInt(int max)
{
return (rand()%max);
}
int main(int argc,char *argv[]){
int i;
int position=1,r=1; /*Position indicates the position of the particle
and r represents where the particle will move
next*/
int L=10,M=20;/*L is the number of sites and M is the number of hops*/
int seed,n,sum=0;
int frequency[L];
//initialization of frequency [can use memset()]
for(i=0;i<L;i++){
frequency[i]=0;
}
//setup the random seed generator
printf("\nEnter your value of seed\n");
scanf("%d",&seed);
srand(seed);
printf("\nThe value of the seed is %d\n",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]);
/*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=position+L;
}
if(position>L-1)
{
position=position-L;
}
}
return 0;
}
谨防使用rand()。根据{{1}}关于rand()：
请注意，此模运算不会在跨度中生成均匀分布的随机数（因为在大多数情况下，此操作会使得较低的数字更有可能）。
特别是在您的情况下，如果v1 = rand() % 100;是偶数，则RAND_MAX将呈现向上循环的轻微趋势......