vector subscript out of range pascal triangle

[dmngu9]

#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <vector>

using namespace std;

int main(int argc, char *argv[])
{
int n;
cout <<"enter number of rows ";
cin>>n;
const int N= n;
vector<vector<int>> matrix;
matrix.resize(N);
for (int i =0; i<N; ++i)
{
matrix[i].resize(N);
}
for (int rows=0; rows<N; rows++)
{
for (int col=0; col<=rows; col++)
{
if ((col = 0) || (col =rows))
{
matrix[rows][col] = 1;
}//end if
else
{
matrix[rows][col] = matrix[rows-1][col] + matrix[rows-1][col-1];
}//end else if
}//end for loop inside
}//end for loop traversing the rows

//print the triangle
for (int r = 0; r < N; r++)
{
for (int c=0; c<=r; c++)
{
cout << "\t"<< matrix[r][c];
}
cout <<endl;
}
system("pause");
return 0;
}


This is my code for pascal triangle. But when I run it, it gave me an error about vector subscript out of range. Please help me with this error. I spent too much time on it without an answer

[TheIdeasMan]

Hi,

Welcome to cplusplus :+)

First up please always use code tags, edit your post, select all the code, press the <> button on the format menu.
It makes your code easier to read, puts line numbers in. Also make sure it is indented.

As for your problem, is it these lines?

for (int col=0; col<=rows; col++)

// ........//

for (int c=0; c<=r; c++)

The standard idiom for a for loop is this:

for (int c = 0; c < r; c++){}

Arrays start at 0, and end at their size-1. Your code goes past the array boundary by one I suspect.

Hope all goes well :+)

[lmptitfy]

#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <vector>

using namespace std;

int main(int argc, char *argv[])
{
	int n;
	
	cout <<"enter number of rows ";
	cin>>n;
	
	const int N= n;
	
	vector<vector<int>> matrix;
	matrix.resize(N);
	
	for (int i =0; i<N; ++i)
	{
		matrix[i].resize(N);
	}
	for (int rows=0; rows<N; rows++)
	{
		for (int col=0; col<=rows; col++)
		{
			if ((col = 0) || (col =rows))
			{
				matrix[rows][col] = 1;
			}//end if
			else 
			{
				matrix[rows][col] = matrix[rows-1][col] + matrix[rows-1][col-1];
			}//end else if 
		}//end for loop inside 
	}//end for loop traversing the rows 

	//print the triangle 
	for (int r = 0; r < N; r++)
	{
		for (int c=0; c<=r; c++)
		{
			cout << "\t"<< matrix[r][c];
		}
		cout <<endl;
	}
	
	system("pause");
	return 0;
}

[dmngu9]

i make terrible rookie mistakes. This line is wrong if ((col = 0) || (col =rows))

it should be if ((col==0)||(col==rows))

haizz. i hate debugging