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Debug Assertion Failed … _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)

vichu8888 (177)
Debug Assertion Failed … _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)


May I know why im getting this error
in google, they said it something problem about dynamic array deletion

I have my own vector class used for a creating a single dimensional array.
Below is the code for my own vector (Vector)
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#ifndef H_VECOTR
#define H_VECTOR
#include"file.h"

template <class elemType>

class Vector
{
	
public:
	friend ostream& operator<<(ostream&, const Vector<elemType>&);
	//const Vector<elemType>& operator=(const Vector<elemType>&);//
	int list_size() const;//
	int max_list_size() const;//
	void print() const;//
	
	void insert(const elemType& insert_item);//
	elemType& retrieve(int location,elemType& ret_item) const;//
	
	Vector(int size=100);//
	virtual ~Vector();//
//protected:
	
	elemType *list;
	int length;
	int max_size;
};
template<class elemType>
int Vector<elemType>::list_size() const
{
	return length;
}

template<class elemType>
int Vector<elemType>::max_list_size() const
{
	return max_size;
}

template<class elemType>
void Vector<elemType>::print() const
{
	for(int i=0;i<length;i++)
		cout<<list[i]<<" ";
	
}



template<class elemType>
elemType& Vector<elemType>::retrieve(int location,elemType& ret_item)const
{
	ret_item = NULL;
	if(location<0||location>=length)
		cout<<"The item is out of range"<<endl;
	else
		ret_item = list[location];
	return ret_item;
}

template<class elemType>
Vector<elemType>::Vector(int size)
{
	if(size<=0)
	{
		cout<<"The array size is negative\n";
		cout<<"Creating an array of size 100.\n";
	}
	else
		max_size=size;
	length=0;
	list=new elemType[max_size];
}
template<class elemType>
Vector<elemType>::~Vector()
{
	delete [] list;
}

template<class elemType>
void Vector<elemType>::insert(const elemType& insert_item)
{
	if(length>=max_size)
		cout<<"List is full. Cannot perform insertion"<<endl;
	else
	{
		list[length]=insert_item;
		//cout<<list[length];
		length++;
	}
}


template<class elemType>
ostream& operator<<(ostream& os, const Vector<elemType>& Tx)
{
	os<<Tx;
	return os;
}

#endif
vichu8888 (177)
Help please
vichu8888 (177)
Now I where the error part is but I dont know exactly which point.
The error is in passing parameters

I passed vector , length and class object as parameter in a function

specific_month(length,Tx,user_month,E); //This is to calculate the number of shares and total cost for the given month
length=file size
Tx= vector class object ( Vector<ex>Tx(length) )
E= object of class ex
user_month=month entered by the user;

I copied the whole code from the function "specific_month" and put it in the main, then I ran the program. Now the error has gone.
What wrong im doing in function parameters?

My function prototype is void specific_month(const int length,Vector<ex> Tx,int user_month,ex E);

Am i passing the vector and class object correctly?
Last edited on
AbstractionAnon (6954)
Not enough code here to diagnose your problem.

If you're getting a debug assertion occurring in the run time memory management routines, you're either passing a bad pointer to delete or you've trashed the heap.
vichu8888 (177)
given my test(main) code. Will be that ok?

Look for the lines 12,62,from 128 to last(these things causing error


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#include<iostream>
#include<fstream>
#include"file.h"
#include<string>
#include<sstream>
#include"Vector.h"

using namespace std;
int get_file_size(ifstream& in);
void output(int& choice);
int month_input();
void specific_month(const int length,Vector<ex> Tx,int user_month,ex E);
int main()
{
	
	ifstream in;
	//finidng file size
	const int length=get_file_size(in);
	
	Vector<ex>Tx(length);
	
	int day,month,year,shares;
	double price;
	string code,activity,line;
	int choice, user_month;
	cout<<"Helloo0"<<endl;
	
	in.open("share-data.txt");
	ex E;
	for(int i=0;i<length;i++)
	{	
		getline(in,line,'/');
		stringstream(line)>>day;
		getline(in,line,'/');
		stringstream(line)>>month;
		getline(in,line,',');
		stringstream(line)>>year;
		getline(in,line,',');
		stringstream(line)>>code;
		getline(in,line,',');
		stringstream(line)>>activity;
		getline(in,line,',');
		stringstream(line)>>shares;
		getline(in,line);
		stringstream(line)>>price;
		E.set_all(day,month,year,code,activity,shares,price);
		cout<<i<<endl;
		Tx.insert(E);		
	}
	
	output(choice);
	
	if(choice==2)
		user_month=month_input();
	else 
	{
		cout<<"Thanks for using the program.Bye-Bye\n";
		system("pause");
		return -1;
	}

	specific_month(length,Tx,user_month,E);
	
	in.close();
	system("pause");
	return 0;
}

int get_file_size(ifstream& in)
{
	in.open("share-data.txt");	
	int temp;
	int size=0;
	while(!in.eof())
	{
		in.ignore(100,'\n');
		in>>temp;
		size++;
	}
	in.close();
	return size;
	cout<<"Size of the file is: "<<size<<endl;
}

void output(int& choice)
{
	cout<<"1. Total capital gain of the year\n";
	cout<<"2. Total shares bought for the given month\n";
	cout<<"3. Exit the program\n";
	cout<<"Please enter your choice: ";
	cin>>choice;
	while(choice<1 || choice>3)
	{
		cout<<"\nERROR:Invalid choice entered "<<endl;
		cout<<"Please enter your choice(1/2/3): ";
		cin>>choice;
	}
	cout<<endl;
}
int month_input()
{
	int user_month;
	cout<<"Please choose the month you want to know shares bought and amount spend\n";
	cout<<"Month     Number\n";
	cout<<"January     1 \n";
	cout<<"Febrauary   2 \n";
	cout<<"March       3 \n";
	cout<<"April       4 \n";
	cout<<"May         5 \n";
	cout<<"June        6 \n";
	cout<<"July        7 \n";
	cout<<"August      8 \n";
	cout<<"September   9 \n";
	cout<<"October    10 \n";
	cout<<"November   11 \n";
	cout<<"Decemebr   12 \n";
	cout<<"\nPlease enter the month number: ";
	cin>>user_month;
	while(user_month<1||user_month>12)
	{
		cout<<"ERROR: Invalid month number!!\n";
		cout<<"Please enter the month number again: ";
		cin>>user_month;
	}
	cout<<endl;
	return user_month;
}
void specific_month(const int length,Vector<ex> Tx,int user_month,ex E)
{
	int month_shares=0;
	double month_spent=0;
	bool found=false;

	for(int i=0;i<length;i++)
	{
		if(user_month==Tx.retrieve(i,E).date1.get_month() && Tx.retrieve(i,E).get_activity()=="buy")
		{
			
			month_shares+=Tx.retrieve(i,E).get_share();
			month_spent+=Tx.retrieve(i,E).get_price();
			found=true;
		}
		
	}
	if(found)
	{
	cout<<"Total share bought for the month "<<user_month<<" is "<<month_shares<<" shares"<<endl;
	cout<<"Amount spend for the month "<<user_month<<" $ "<<month_spent<<endl;
	}
	else
		cout<<"No such activites"<<endl;
}
Last edited on
vichu8888 (177)
Got it! In my function declaration,
void specific_month(const int length,Vector<ex> Tx,int user_month,ex E);

I didnt pass vector class as reference. In vector class, i have a destructor of array created dynamically. As I pass Vector as value, the function couldnt delete it after program finish. When I changed the Vector as pass by reference, the error has gone

void specific_month(const int length,Vector<ex>& Tx,int user_month,ex E);
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