用C语言程序编程出：设数组a中有n(n<10)个字符元素，用选择排序法将这n个元素按照ASCII码值从小到大排序。 样例输入 :5 bDfea 样例输出: Dabef

以下是C语言程序代码：

#include <stdio.h>

void selectionSort(char arr[], int n)
{
    int i, j, min_idx;
    char temp;

    // One by one move boundary of unsorted subarray
    for (i = 0; i < n-1; i++)
    {
        // Find the minimum element in unsorted array
        min_idx = i;
        for (j = i+1; j < n; j++)
            if (arr[j] < arr[min_idx])
                min_idx = j;

        // Swap the found minimum element with the first element
        temp = arr[min_idx];
        arr[min_idx] = arr[i];
        arr[i] = temp;
    }
}

int main()
{
    int n, i;
    char a[10];

    printf("Enter the number of elements: ");
    scanf("%d", &n);

    printf("Enter the elements: ");
    for(i = 0; i < n; i++)
    {
        scanf(" %c", &a[i]);
    }

    selectionSort(a, n);

    printf("Sorted array: ");
    for(i = 0; i < n; i++)
    {
        printf("%c", a[i]);
    }
    printf("\n");

    return 0;
}

代码实现了选择排序算法，将字符数组按照ASCII码值从小到大排序，可以通过输入字符元素的个数和字符元素本身进行测试。