Assertion Failure Help

[gh24]

Hi Guys,

I am getting an assertion failure for the following code and I have no clue why.

#include <iostream>
#include <cmath>
#include <vector>
#include <fstream>

using namespace std;

 int main(){

	double value_just_read_from_file;
	vector <double> P;

	ifstream input_file ("Data.txt");

	if (input_file.is_open ())
	{
			while(input_file >> value_just_read_from_file)
			{
				P.push_back(value_just_read_from_file);
			}
	}
	else
			cout << "Input_file_Data.txt_does_not_exist_in_PWD" << endl;
	cout << "Vector_P_has_" <<P.size() << "_entries, _and_They_are : " <<endl;
	for (size_t i = 0; i <= P.size(); i++)
				cout << P[i] << "\t" ;
	cout << endl;
}

The Data.txt file is just 5 numbers.

Any help would be appreciated.

Thanks for taking a look.

[gh24]

Also I am working on making a program like the one above that will read multiple lines of data but I am pretty lost. I know how many lines their are from the first line of the code but I am unsure how to integrate this into the code as needed.

[gh24]

Please help if you can!!

[bennyp]

To say nothing about the rest of your program... This statement will try to read past the end of vector P, causing an assertion error for subscript oorange:

	for (size_t i = 0; i <= P.size(); i++)
				cout << P[i] << "\t" ;

size() returns the number of elements in the vector. If the size of P is 5, the last valid iterator is 4. Instead:

	for (size_t i = 0; i < P.size(); i++)
				cout << P[i] << "\t" ;

[gh24]

Yea I figured that out. I added a return(P) at the end. The thing does exactly what it was supposed to now. I am working to enhance it now though and failing miserably. different topic though.