例22：快速排序

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 
 4 void MyQuickSort(int *pArray,int Start,int End)
 5 {
 6                 int key = pArray[Start];
 7                 int low = Start,high = End;
 8                 while(low < high)
 9                 {
10                         while(low < high && key < pArray[high])
11                         {
12                                     high--;
13                         }
14                         pArray[low] = pArray[high];
15                         while(low < high && key > pArray[low])
16                         {
17                                   low++;
18                         }
19                         pArray[high] = pArray[low];
20                 }
21                 pArray[low] = key;
22                 if(Start < low)
23                 MyQuickSort(pArray,Start,low);
24                 if(End > low+1)
25                 MyQuickSort(pArray,low+1,End);
26 }
27 
28 int main()
29 {
30     int pArray[20],nCount;
31     while(~scanf("%d",&nCount) && nCount)
32     {
33                                for(int i = 0; i<nCount && i<20;i++)
34                                {
35                                        scanf("%d",&pArray[i]);
36                                }
37                                MyQuickSort(pArray,0,nCount-1);
38                                for(int i = 0;i<nCount && i<20;i++)
39                                {
40                                        printf("%d ",pArray[i]);
41                                }
42     }
43     
44     return 0;
45 }

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 
 4 void MyQuickSort(int *pArray,int Start,int End)
 5 {
 6                 int key = pArray[Start];
 7                 int low = Start,high = End;
 8                 while(low < high)
 9                 {
10                         while(low < high && key < pArray[high])
11                         {
12                                     high--;
13                         }
14                         pArray[low] = pArray[high];
15                         while(low < high && key > pArray[low])
16                         {
17                                   low++;
18                         }
19                         pArray[high] = pArray[low];
20                 }
21                 pArray[low] = key;
22                 if(Start < low)
23                 MyQuickSort(pArray,Start,low);
24                 if(End > low+1)
25                 MyQuickSort(pArray,low+1,End);
26 }
27 
28 int main()
29 {
30     int pArray[20],nCount;
31     while(~scanf("%d",&nCount) && nCount)
32     {
33                                for(int i = 0; i<nCount && i<20;i++)
34                                {
35                                        scanf("%d",&pArray[i]);
36                                }
37                                MyQuickSort(pArray,0,nCount-1);
38                                for(int i = 0;i<nCount && i<20;i++)
39                                {
40                                        printf("%d ",pArray[i]);
41                                }
42     }
43     
44     return 0;
45 }