[英]Why this code does not produce output? c++ binary search using xcode
//使用c ++進行二進制搜索。 main函數不提供任何輸出。 這是簡單的二進制搜索算法實現。
#include <iostream>
using namespace std;
int BinarySearch(int *a, int x, int n ){
int left = 0;
int right = n-1;
while(left<=right){
int middle = left + right /2;
if (x>a[middle]) {
left = middle +1;
}
else if (x<a[middle]){
right = middle -1;
}
else return middle;
}
return 1;
}
int main(int argc, const char * argv[])
{
cout<<"Hello World";
int a[] ={1,2,3,4,5,6,7,8,9,10};
int x = 3;
int n = 10;
int var = BinarySearch(a, x, n);
cout<<"The search result:"<<endl;
cout<< var;
return 0;
}
您缺少周圍的偏癱
int middle = left + right / 2;
一定是
int middle = (left + right) / 2;
而且您可能還想返回
return a[middle]; //instead of middle;
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