[英]Binary search algorithm in c++
我是編程新手,所以請幫我完成任務,問題是:按 y 后,while 循環不再運行。 其次,如何按降序打印或獲取數組元素?
謝謝你!
#include <iostream>
using namespace std;
int main()
{
int item;
int flaging = 0;
int ind_low = 0;
int ind_high = 9;
int ind_mid = (ind_low + ind_high) / 2;
char conti;
//Array declaration and taking user input
int arr[10];
cout << "enter some values here : \n" << endl;
for (int i = 0; i < 10; i++)
{
cin >> arr[i];
}
// for sorthing the array
int temp;
for (int p = 1; p <= 9; p++)
for (int c = 0; c <= 8; c++)
if (arr[c] > arr[c + 1])
{
temp = arr[c];
arr[c] = arr[c + 1];
arr[c + 1] = temp;
}
do {
//asking for searching
cout << "Enter the value you want to search : " << endl;
cin >> item;
while (ind_low <= ind_high)
{
if (item == arr[ind_mid])
{
cout << "At " << ind_mid << " index the value " << item << " is found " << endl;
flaging++;
break;
}
if (item < arr[ind_mid])
{
ind_high = ind_mid - 1;
ind_mid = (ind_low + ind_high) / 2;
}
else
{
ind_low = ind_mid + 1;
ind_mid = (ind_low + ind_high) / 2;
}
}
if (flaging == 0)
{
cout << "Value not found" << endl;
}
cout << "To search again press 'y', to exit press any key" << endl;
cin >> conti;
} while ((conti == 'y') || (conti == 'Y'));
}
當我在按 y 后在我的電腦上運行它時,它確實再次運行了,你能提供讓你失敗的輸入嗎? 對於第二個問題,你是什么意思? 你可以做一個這樣的for循環:
for(int index = ARR_SIZE -1 ; index >= 0 ; --index){
cout << array[index];
}
編輯:我明白你的意思。 每次運行后,您應該重置索引,否則您將始終運行一次:
在結束循環之前,應重置值。
ind_low = 0;
ind_high = 9;
ind_mid = (ind_low + ind_high) / 2;
這將從頭到尾打印數組。
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