add by jinshaohui for bsearch

c-cpp/15_bsearch/bsearch_c/bsearch.c

@@ -0,0 +1,88 @@
+/*************************************************************************
+ > File Name: bsearch.c
+ > Author:  jinshaohui
+ > Mail:    jinshaohui789@163.com
+ > Time:    18-10-21
+ > Desc:    
+ ************************************************************************/
+#include<stdio.h>
+#include<stdlib.h>
+#include<assert.h>
+
+
+int mybsearch(int a[],int size,int value)
+{
+	int mid = 0;
+	int left = 0;
+	int right = size - 1;
+
+	while(left <= right)
+	{
+		/*防止size数量太大是，（left + right）数据翻转，导致问题*/
+		mid = left + ((right - left)>>1);
+
+		if (a[mid] == value)
+		{
+			return mid;
+		}
+		else if (a[mid] < value)
+		{
+			left = mid + 1;
+		}
+		else
+		{
+			right = mid - 1;
+		}
+	}
+
+	return -1;
+}
+
+int helper(int a[], int left,int right,int value)
+{
+	int mid = 0;
+
+	if (left > right)
+	{
+		return -1;
+	}
+	/*防止size数量太大是，（left + right）数据翻转，导致问题*/
+	mid = left + ((right - left)>>1);
+	if (a[mid] == value)
+	{
+		return mid;
+	}
+	else if (a[mid] < value)
+	{
+		return helper(a,mid + 1,right,value);
+	}
+	else
+	{
+		return helper(a,left,mid - 1,value);
+	}
+    return -1;
+}
+/*递归实现*/
+int mybsearch_2(int a[],int size,int value)
+{
+
+	return helper(a,0,size-1,value);
+}
+
+int main()
+{
+	int a[10] = {5,6,8,9,10,11,23,42,53,123};
+    int data = 0;
+	int res = 0;
+
+	printf("\r\n输入一个整数");
+	scanf("%d",&data);
+    res = mybsearch(a,10,data);
+	printf("data[%d] %s 在数据中，下标是%d",data,(res != -1)?"":"不",res);
+	
+	printf("\r\n输入一个整数");
+	scanf("%d",&data);
+    res = mybsearch_2(a,10,data);
+	printf("data[%d] %s 在数据中，下标是%d",data,(res != -1)?"":"不",res);
+	return;
+}