第14週プロジェクト1.1.1.半値検索

#include <stdio.h>
#define MAXL 100
typedef int KeyType;
typedef char InfoType[10];
typedef struct
{
    KeyType key;                //KeyType         
    InfoType data;              //    
} NodeType;
typedef NodeType SeqList[MAXL];     //     

int BinSearch(SeqList R,int n,KeyType k)
{
    int low=0,high=n-1,mid;
    while (low<=high)
    {
        mid=(low+high)/2;
        if (R[mid].key==k)      //      
            return mid+1;
        if (R[mid].key>k)       //   R[low..mid-1]   
            high=mid-1;
        else
            low=mid+1;          //   R[mid+1..high]   
    }
    return 0;
}

int main()
{
    int i,n=10;
    int result;
    SeqList R;
    KeyType a[]= {1,3,9,12,32,41,45,62,75,77},x=75;
    for (i=0; i<n; i++)
        R[i].key=a[i];
    result = BinSearch(R,n,x);
    if(result>0)
        printf("     %d    %d
",result, x);
    else
        printf("    ！
");
    return 0;
}