判断用户输入的一个整数是否在以已知数组中

           import java.util.*;

class Example Txt1{

public static void main(String args[]){

int start=0,end,middle;

int a[]={12,45,67,-45,67};

int N=a.length;

for(int i=0; i<N;i++){   //选择法排序数组

for(int j=i+1;j<N;j++){

if (a[j]<a[i]){

int t=a[j];

a[j]=a[i];

a[i]=t;

}

       }

          }

Scanner scanner=new  Scanner(System.in);

System.out.printfln("输入整数，程序判断该整数是否在数组中：”)；

int number=scanner,nextInt();

int count=0;

end=N;

middle=(start+end)/2;

while(number!=a[middle]){

if(number>a[middle]){

start=middle;

else if(number<a[middle]）

end=middle;

middle=(start+end/2);

count++;

if(count>N/2)

break;

}

if(count>N/2)

System.out.printf("%d不在数组中.\n,number);

else

System.out.printf("%d在数组中.\n,number);

      }

}  

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