C语言--随机生成一个数组并逆置输出

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方案一：直接使用数组

思路：随机生成一个数组，倒序输出

# include <stdio.h>
# include <stdlib.h>
# include <time.h>
int main (void)
{
        int i,n,j;
        printf("Enter a number n : ");
        scanf("%i",&n);
        int a[n];
        srand((unsigned)time(NULL));
        for (i = 0 ;i < n; i++)
                a[i] = rand()%100+1;
        for (i = 0 ;i < n; i++)
                printf("****");
        printf("\n");
        for (i = 0 ;i < n; i++)
                printf("%4i",a[i]);
        printf("\n");
        for (i = 0 ;i < n; i++)
                printf("****");
        printf("\n");
        for (j = n-1 ;j >= 0; j--)
                printf("%4i",a[j]);
        printf("\n");
        return 0;
}

测试：

[root@security Gcc]# ./a.out
Enter a number n : 10
****************************************
79 77 38 80 25 20 37 22 46 97
****************************************
97 46 22 37 20 25 80 38 77 79
[root@security Gcc]# ./a.out
Enter a number n : 20
********************************************************************************
18 83 61 1 87 94 34 56 84 87 88 73 5 80 2 82 3 57 65 97
********************************************************************************
97 65 57 3 82 2 80 5 73 88 87 84 56 34 94 87 1 61 83 18

方案一的改进，使用函数调用：

# include <stdio.h>
# include <stdlib.h>
# include <time.h>
int n,i;
int main (void)
{
        printf("Enter a number n : ");
        scanf("%i",&n);
        int a[n];
        Create(a,n);
        PrintLine();
        PrintArray(a,n);

# include <stdio.h>
# include <stdlib.h>
# include <time.h>
int n,i;
int main (void)
{
        printf("Enter a number n : ");
        scanf("%i",&n);
        int a[n];
        Create(a,n);
        PrintLine();
        PrintArray(a,n);
        PrintLine();
        PrintArrayInvert(a,n);
        return 0;
}
int Create(int *array , int n)
{
        srand((unsigned)time(NULL));
        for (i = 0 ; i<n ;i++)
                array[i] = rand()%100+1;
}

void PrintLine(void)
{
        for (i = 0 ; i < n;i++)
                printf("****");
        printf("\n");
}

int PrintArray(int *array , int n )
{

        for (i = 0 ; i < n ;i++)
                printf("%4i",array[i]);
        printf("\n");
}

int PrintArrayInvert(int *array , int n)
{

        for (i = n-1 ; i >= 0 ;i--)
                printf("%4i",array[i]);
        printf("\n");
        return 0;
}

测试结果：

[root@security Gcc]# vim Invert_Array-2.c
[root@security Gcc]# gcc -w Invert_Array-2.c
[root@security Gcc]# ./a.out
Enter a number n : 12
************************************************
16 50 43 8 7 14 30 72 73 19 54 35
************************************************
35 54 19 73 72 30 14 7 8 43 50 16

方案二：使用指针将原数组逆置新数组

# include <stdio.h>
# include <stdlib.h>
# include <time.h>
int n,i;
int main (void)
{
        printf("Enter a number a : ");
        scanf("%i",&n);
        int a[n];
        CreateArray(a,n);
        PrintArray(a,n);
        PrintLine();
        ArrayInvert(a,n);
        PrintArray(a,n);
        return 0;
}

int CreateArray(int *array, int n )
{

        srand((unsigned)time(NULL));
        for (i = 0 ; i < n; i++)
                array[i] = rand()%100+1;
}
int PrintArray(int *array , int n)
{
        for (i = 0 ; i < n; i++)
                printf("%4i",array[i]);
        printf("\n");
}

void PrintLine()
{
        for (i = 0 ; i < n; i++)
                printf("****");
         printf("\n");

}
int ArrayInvert(int *array , int n)
{
        int m,temp ,*p,*q,*j;

        m = (n-1)/2;
        p = array ; q = array+n-1; j = array + m;
        for ( ; p < q ; p++,q--)
        {
                temp = *p;
                *p = *q;
                *q = temp;
        }
}

测试：

[root@security Gcc]# gcc -w Invert_Array-3.c
[root@security Gcc]# ./a.out
Enter a number a : 3
15 34 25
************
25 34 15
[root@security Gcc]# ./a.out
Enter a number a : 10
65 73 12 31 19 86 56 96 37 52
****************************************
52 37 96 56 86 19 31 12 73 65
[root@security Gcc]# ./a.out
Enter a number a : 8
68 53 23 70 34 80 68 63
********************************
63 68 80 34 70 23 53 68

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