課本例題2-5

import java.util.*;
public class Ecample2_5 {


public static void main(String[] args) {
int start = 0,end,middle;
int a[] = {12,45,67,89,123,-45,67};
int N = a.length;
for(int i=0; i<N; i++) {
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.println("輸入整數,程序判斷該整數是否在數組中:");
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不在數組中.\n",number);
else
System.out.printf("%d在數組中.\n",number);
}


}


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