隨機生成數組

用隨機數給一個二維數組賦值  要求不能有重複的數據

方法一：

 1 #include <stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int main()  5 {  6  srand((unsigned)time(NULL));  7     int arr[100];  8     for (int i = 0; i < 100; i++)  9  { 10         arr[i] = rand() % 200; 11         for (int j = 0; j <i; j++) 12  { 13             if (arr[j]==arr[i]) 14  { 15                 --i; 16                 break; 17  } 18  } 19  } 20     for (int i = 0; i < 100; i++) 21  { 22         printf("%d\t", arr[i]); 23  } 24  getchar(); 25     return 0; 26 }

方法二：

 1 #include <stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int main()  5 {  6  srand((unsigned)time(NULL));  7     int arr[100];  8     for (int i = 0; i < 100; i++)  9  { 10         arr[i] = i; 11  } 12     int temp, m; 13     for (int j = 99; j > 0; j--) 14  { 15         m = rand() % j; 16         temp = arr[j]; 17         arr[j] = arr[m]; 18         arr[m] = temp; 19  } 20     for (int i = 0; i < 100; i++) 21  { 22         printf("%d\t", arr[i]); 23  } 24  getchar(); 25     return 0; 26 }