能不能帮忙看一下我编的这个堆排序

用的是VS2012，一运行就死循环了，不知道是什么问题。
#include <iostream>
void heapadjust(int a[],int i,int length)
{
    for(int child=2*i+1;i<=length/2-1;i=child)
    {
        if(a[child]>a[child+1]&&child<length-1)
        child=child+1;
        if(a[child]>a[i])
        {
            int temp;
            temp=a[i];
            a[i]=a[child];
            a[child]=temp;
        }
    }
}
void buildheap(int a[],int length)
{
    int i=length/2-1;
    for (;i>0;i--)
    {
        heapadjust(a,i,length);
    }
}
void heapsort(int a[],int length)
{
    int temp;
    int i=length;
    for(i=length;i>0;i--)
    {
        buildheap(a,i);
        temp=a[0];
        a[0]=a[i];
        a[i]=temp;
    }
}
void main()
{
    int a[]={10,15,56,25,30,70,12,3,92,32};
    std::cout<<"original array= ";
        for(int i=0;i<10;i++)
        {
            std::cout<<a[i]<<" ";
        }
        std::cout<<"\n";
        heapsort(a,10);
    std::cout<<"current array= ";
        for(int i=0;i<10;i++)
        {
            std::cout<<a[i]<<" ";
        }
        std::cout<<"\n";
        system ("pause");
}