查找

#include  <stdio.h>
#include  <stdlib.h>
#define  MAX  100

int binarySearch(int list[], int n, int key, int *count) {
	int low = 0, high = n - 1, num = 0;
	int t = (low + high) / 2;
	while (low <= high) {
		if (list[t] == key) {
			num++;
			(*count) = num;//这是属于覆盖，而(*count)++则是在地址上的量自增，在以后使用到他时仍是那个值。。。
			return t;
		} else if (list[t] < key) {
			num++;
			low = t + 1;
			t = (low + high) / 2;
		} else {
			num++;
			high = t - 1;
			t = (low + high) / 2;
		}
	}
	(*count) = num;
	return -1;
}




void  sort(int  list[],  int  n) {
	int i, j, t;
	for (i = 1; i < n; i++) {
		for (j = 0; j < n - i; j++) {
			if (list[j] > list[j + 1]) {
				t = list[j + 1];
				list[j + 1] = list[j];
				list[j] = t;
			}
		}
	}

}

int  main() {
	int  i, n, key, count = 0;
	int  a[MAX];
	while (scanf("%d", &n) == 1) {
		for (i = 0; i < n; i++) {
			scanf("%d", &a[i]);
		}
		sort(a, n);
		scanf("%d", &key);
		if ((i = binarySearch(a, n, key, &count)) >= 0) {
			printf("%d  [%d]\n", i + 1, count);
		} else {
			printf("no  [%d]\n", count);
		}
	}
	return  0;
}