#include<iostream.h>
typedef struct{
    int *data;
    int length;
}ST;
int creat(ST *t, int key){    //折半查找开始
    int low,mid,high;
    int flag;
    low=1;
    flag=0;
    high=t->length;
    while(low<=high){
        mid=(low+high)/2;
        if(key<t->data[mid])
            high=mid-1;
        else if(key>t->data[mid])
            high=mid+1;
        else
        {flag=mid;
        break;}
    }
    return flag;
}
void main(){
    int a[]={1,2,3,4,5,6,7,8,9,11};
    ST *p;
    int f;
    p->data=a;         //错误
    f=creat(p,3);
    cout<<f;
}
错误提示：local variable 'p' used without having been initialized