Help... runtime error in my maxheap sort program Post: 302511214

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Top Forums Programming Help... runtime error in my maxheap sort program Post 302511214 by disaster on Wednesday 6th of April 2011 07:05:05 AM

04-06-2011

Registered User

Code:

#include<iostream>
using namespace std;
int *a,size,heapsize;
void maxheap(int *a,int j)
{
    int l,r,largest,temp;
    l=2*j;
    r=(2*j)+1;
    for(j=0;j<size;++j)
    {
        if(l<=heapsize && a[l]>a[j])
            largest=l;
        else
            largest=j;
        if(r<=heapsize && a[r]>a[largest])
            largest=r;
        if(largest!=j)
        {
            a[temp]=a[j];
            a[j]=a[largest];
            a[largest]=a[temp];
            maxheap(a,largest);
        }
    }    
}
void buildmax(int *a)
{
    heapsize=size;
    int n=size/2;
    for(int i=n;i>0;--i)
        maxheap(a,i);
}
void heapsort(int *a)
{
    int tempo;
    buildmax(a);
    for(int i=heapsize;i>0;--i)
    {
        a[tempo]=a[0];  
        a[0]=a[i];
        a[i]=a[tempo];
        --heapsize;
        maxheap(a,0);
    }
}
int main()
{
    cout<<"\nEnter the number of elements you want to enter in the array: ";
    cin>>size;
    int *a= new int [size];
    cout<<"\nEnter an array of elements: ";
    for(int i=0;i<size;++i)
        cin>>a[i];
    heapsort(a);
   /* cout<<"\nThe corresponding array is: ";
    for(int i=0;i<size;++i)
        cout<<a[i]; */
    buildmax(a);
    cout<<"\nThe sorted array is: ";
    for(int i=0;i<size;++i)
        cout<<a[i]<<"\t";
    return 0;
}

What do you consider "entering the array".
Anyways, in function heapsort you make use of an uninitialized int tempo, so I assume you will most likely have the error there

disaster

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std::exception

std::exception(3)					     Library Functions Manual						 std::exception(3)

NAME

       std::exception -

SYNOPSIS

       Inherited by __gnu_cxx::__concurrence_broadcast_error, __gnu_cxx::__concurrence_lock_error, __gnu_cxx::__concurrence_unlock_error,
       __gnu_cxx::__concurrence_wait_error, __gnu_cxx::forced_error, __gnu_cxx::recursive_init_error, std::bad_alloc, std::bad_cast,
       std::bad_exception, std::bad_function_call, std::bad_typeid, std::bad_weak_ptr, std::ios_base::failure, std::logic_error, and
       std::runtime_error.

   Public Member Functions
       virtual const char * what () const noexcept

Detailed Description
       Base class for all library exceptions.

       This is the base class for all exceptions thrown by the standard library, and by certain language expressions. You are free to derive your
       own exception classes, or use a different hierarchy, or to throw non-class data (e.g., fundamental types).

       Definition at line 60 of file exception.

Member Function Documentation
   virtual const char* std::exception::what () const [virtual],  [noexcept]
       Returns a C-style character string describing the general cause of the current error.

       Reimplemented in std::bad_function_call, std::ios_base::failure, std::bad_typeid, std::bad_cast, std::runtime_error, std::future_error,
       std::bad_exception, std::logic_error, std::bad_weak_ptr, and std::bad_alloc.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Jun 10 2014						 std::exception(3)