嵌入式：C高级 Day4

一、整理思维导图

二、写一个函数，获取用户的uid和gid并使用变量接收

三、整理冒泡排序、简单选择排序和快速排序的代码 

冒泡排序

#include <myhead.h>void output(int arr[], int len);
void bubble_sort(int arr[], int len);int main(int argc, const char *argv[])
{int arr[] = {9, 6, 15, 11, 23, 14, 32, 12};int len = sizeof(arr) / sizeof(arr[0]);output(arr, len);bubble_sort(arr, len);output(arr, len);return 0;
}void bubble_sort(int arr[], int len){int count, temp;for(int i = 0; i < len; i++){count = 0;for(int j = 0; j < len - 1 - i; j++){if(arr[j] > arr[j + 1]){temp = arr[j];arr[j] = arr[j + 1];arr[j + 1] = temp;count++;}}if(count == 0){break;}}
}void output(int arr[], int len){for(int i = 0; i < len; i++){printf("%d ", arr[i]);}puts("");
}

简单选择排序：

#include <myhead.h>void output(int arr[], int len);
void select_sort(int arr[], int len);int main(int argc, const char *argv[])
{int arr[] = {9, 6, 15, 11, 28, 25, 22, 37, 18};int len = sizeof(arr) / sizeof(arr[0]);output(arr, len);select_sort(arr, len);output(arr, len);return 0;
}void select_sort(int arr[], int len){int min, temp;for(int i = 0; i < len - 1; i++){min = i;for(int j = i + 1; j < len; j++){if(arr[min] > arr[j]){min = j;}}if(min != i){temp = arr[min];arr[min] = arr[i];arr[i] = temp;}}
}void output(int arr[], int len){for(int i = 0; i < len; i++){printf("%d ", arr[i]);}puts("");
}

快速排序：

#include <myhead.h>void output(int arr[], int len);
void quick_sort(int arr[], int low, int high);
int onesort(int arr[], int low, int high);int main(int argc, const char *argv[])
{int arr[] = {9, 6, 13, 11, 19, 25, 12, 37, 22};int len = sizeof(arr) / sizeof(arr[0]);output(arr, len);quick_sort(arr, 0, len - 1);output(arr, len);return 0;
}void quick_sort(int arr[], int low, int high){while(low >= high){return;}int mid = onesort(arr, low, high);quick_sort(arr, 0, mid - 1);quick_sort(arr, mid + 1, high);
}int onesort(int arr[], int low, int high){int key = arr[low];while(low < high){while(low < high && key <= arr[high]){high--;}arr[low] = arr[high];while(low < high && key >= arr[low]){low++;}arr[high] = arr[low];}arr[low] = key;return low;
}void output(int arr[], int len){for(int i = 0; i < len; i++){printf("%d ", arr[i]);}puts("");
}