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#include<stdio.h> #include<stdlib.h> #include<string.h> #define SIZE 100 //从小到大排序 int comp1( const void *x, const void *y) { return *( int *)x - *( int *)y; } //从大到小排序 int comp2( const void *x, const void *y) { return *( int *)y - *( int *)x; } void main() { int arr[SIZE]; int n = 0; //数组的有效长度 int t = 0; int i; printf ( "input the arr(Q to quit).\n" ); while ( (t = scanf ( "%d" ,&arr[n])) != 0) { n++; } printf ( "arr before qsort.\n" ); for (i = 0; i < n; i++) { printf ( "arr[%d]=%d\t" ,i,arr[i]); if ((i+1) % 5 == 0) { printf ( "\n" ); } } qsort (arr,n, sizeof ( int ),comp1); printf ( "\narr after qsort.\n" ); for (i = 0; i < n; i++) { printf ( "arr[%d]=%d\t" ,i,arr[i]); if ((i+1) % 5 == 0) { printf ( "\n" ); } } qsort (arr,n, sizeof ( int ),comp2); printf ( "\nRecover All.\n" ); for (i = 0; i < n; i++) { printf ( "arr[%d]=%d\t" ,i,arr[i]); if ((i+1) % 5 == 0) { printf ( "\n" ); } } printf ( "\n" ); } |
只带两个参数的快速排序:
编写快速排序,函数qsort(),函数只带两个参数
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#include<stdio.h> #include<time.h> #include<stdlib.h> #define LEN 10 typedef int dataType; //初始化数组,数组元素为小于100的整数 void intiArr(dataType A[], int len); //打印数组元素 void print(dataType A[], int len); //带两个参数的快排 void qsort (dataType A[], int len); int main() { dataType data[LEN]; intiArr(data,LEN); printf ( "排序前数组元素:" ); print(data,LEN); qsort (data,LEN); printf ( "排序后数组元素:" ); print(data,LEN); return 0; } |
初始化数组,数组元素为小于100的整数
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void intiArr(dataType A[], int len) { int i; srand ((unsigned) time (NULL)); for (i = 0; i < len; i++) { A[i] = rand () % 100; } } |
打印数组元素
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void print(dataType A[], int len) { int i; for (i = 0; i < len; i++) { if (i % 5 == 0) printf ( "\n" ); printf ( "%d\t" ,A[i]); } printf ( "\n" ); } |
带两个参数的快排
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void qsort (dataType A[], int len) { dataType *p = A; dataType *q = A + len - 1; dataType temp = *p;; if (len <= 0) { return ; } while (p < q) { while ((p < q) && (*q >= temp)) { q--; } *p = *q; while ((p < q) && (*p <= temp)) { p++; } *q = *p; } *p = temp; qsort (A,p - A); qsort (p + 1,len - (p - A) - 1); } |