#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void main()
{
    int i,j,k,tem, num,a[4];
    int b[4] = {0}, count = 0;
    srand(time(0));
    num = rand() % 10000;
    //printf("%d ", num);
    printf("请输入你猜的四个数:");
    for (i = 0; i < 4; i++)
    {
        scanf("%d",&a[i]);
    }
    for (i = 0; i < 4; i++)
    {
        tem = num % 10;
        num = num / 10;
        for (j = 0; j < 4; j++)
        {
            if (a[j] == tem)
            {
                for (k = 0; k < count; k++)
                {
                    if (b[k] == tem)//相同的数字不统计
                    {
                        break;
                    }
                }
                if (k == count)
                {
                    b[count] = tem;
                    count++;
                }
            }
        }
    }
    printf("你输入的数中有%d个数字正确，正确的数是：\n", count);
    for (i = 0; i < count; i++)
    {
        printf("%d ", b[i]);
    }
}

不是输入四个数，而是输入一个四位数，电脑随机产生一个四位数让我猜，要怎么改呢？

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void main()
 {
    int a[4],b[4],h,num,i,tem,gs=0,j,k=0;
    srand(time(0));
     num = rand() % 10000;
    // printf("%d ", num);
    printf("请输入你猜的四个数字:");
    scanf("%d",&h);
    for(i=0;i<4;i++)
    {
        a[i]=h%10;
        h/=10;
    }
    for(i=0;i<4;i++)
    {
        tem=num%10;
        num/=10;
        for(j=0;j<4;j++)
        {
            if(a[j]==tem)
            {
            b [k]=a[j];
            a[j]=-1;
            k++;
            gs++;
            break;
            }
        }
    }
     printf("你输入的数中有%d个数字正确，正确的数是：\n", gs);
     for (i = 0; i < gs; i++)
     {
         printf("%d ", b[i]);
   
   
 }}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
    int i,j,k,tem, num,num1,a,as[4];
    int b[4]={0},count = 0;
    srand(time(0));
    num = rand() % 10000;
    printf("%d ", num);

    while(1)
    {
        num1=num;
        count=0;
        k=0;
        printf("\n请输入你猜的数:");
         scanf("%d",&a);
        for(i=0;i<4;i++)
        {
            tem=a%10;
            as[i]=tem;
            a=a/10;
        }         
        for (i = 0; i < 4; i++)
    {
        tem = num1 % 10;
        num1 = num1 / 10;
        for (j = 0; j < 4; j++)
        {
            if (as[j] == tem)
            {
                as[j]=10;
                b[k]=tem;
                k++;
                count++;
                break;
            }
        }
    }
    printf("\n你输入的数中有%d个数字正确，正确的数是：\n", count);
    for (i = count-1; i >=0; i--)
    {
        printf("%d ", b[i]);
    }
    if(count==4)  break;
    }
   

}