随机生成数组

用随机数给一个二维数组赋值  要求不能有重复的数据

方法一：

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    srand((unsigned)time(NULL));
    int arr[100];
    for (int i = 0; i < 100; i++)
    {
        arr[i] = rand() % 200;
        for (int j = 0; j <i; j++)
        {
            if (arr[j]==arr[i])
            {
                --i;
                break;
            }
        }
    }
    for (int i = 0; i < 100; i++)
    {
        printf("%d	", arr[i]);
    }
    getchar();
    return 0;
}

方法二：

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    srand((unsigned)time(NULL));
    int arr[100];
    for (int i = 0; i < 100; i++)
    {
        arr[i] = i;
    }
    int temp, m;
    for (int j = 99; j > 0; j--)
    {
        m = rand() % j;
        temp = arr[j];
        arr[j] = arr[m];
        arr[m] = temp;
    }
    for (int i = 0; i < 100; i++)
    {
        printf("%d	", arr[i]);
    }
    getchar();
    return 0;
}