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# Thread: Pascal's Triangle Using For Loops

1. Junior Member
Join Date
Oct 2009
Posts
1

## Pascal's Triangle Using For Loops

Ok, so this is what i have...

When i build it I just get a vertical line of 1's. There are no variables the task is straight forward. We have to make a program the when executed displays the first 10 rows. I'm not good at this and im also not looking for someone to write the program for me I just need advice as I can't find the problem. I think I can do the formatting the output by myself but I'd like to get it to output the right stuff first.

Code:
```#include <iostream>
#include <iomanip>

using namespace std;

void main ()

{
// Define variables

int n;         // "n things"
int k;         // "k times"
int K;			// Used to help calculate factorial
int N;			// Used to help calculate factorial
int a;			// "n - k" renamed
int A;			// Used to help calculate factorial
int number;	// Final output number

// For Loops to calculate factorials

for (n = 0; n <= 10; n+= 1)
{

for (k = 0; k <= n; k += 1)
{
if (n = 0 || 1)
N = 1;
else
{
N = n;

for (n = n; n > 1; n--)
N = N * (n-1);
}

if (k = 0 || 1)
K = 1;
else
{
K = k;

for (k = k; k > 1; k = k - 1)
K = K * (k-1);
}

a = n - k;

if (a = 0 || 1)
A = 1;
else
{
A = a;

for (a = a; a > 1; a = a - 1)
A = A * (a-1);
}

number = N / (K * A);

cout << number << endl;}
// Output

}}```

2. ## Re: Pascal's Triangle Using For Loops

Take a look at this statement...several more like it in your code...this should have kicked up a warning when you compiled...you are assigning (NOT comparing) the value of "0" ZERO to "n" within an if statement.

Code:
`if (n = 0 || 1)`
Last edited by Vanaj; October 20th, 2009 at 03:27 PM.

3. Junior Member
Join Date
Oct 2009
Posts
4

## Re: Pascal's Triangle Using For Loops

Hey i learnt and tried to implement pascal triangle. It may not be perfect but it works great.

#include <iostream>
using namespace std;

int main()
{
int rows, rows2, space;
cout<<"\n Enter the no.of rows to be displyed in the pascal triangle\t";
cin>>rows;
rows2= rows;
//int a[][] = new int [rows][rows];
int a[15][15];
int i=0,j=0;

if (rows ==1)
{
a[i][j]=1;
cout<<"\n" <<a[i][j];

}
else if (rows == 2)
{
a[i][j]=1;
cout<<"\n"<<"\t" << a[i][j];
i++;
a[i][j]=a[i][j+1]=1;
cout<<"\n" <<a[i][j] <<"\t\t" << a[i][j+1] ;

}
else
{
a[i][j]=1;
cout<<"\n";
for (space =1; space <= rows2; space ++)
cout<<"\t";
cout<< a[i][j];
i++; rows2--;

a[i][j]=a[i][j+1]=1;
cout<<"\n";
for (space =1; space <= rows2; space ++)
cout<<"\t";
cout<<a[i][j] <<"\t\t" << a[i][j+1] ;
rows2--;
//cout<<rows2;

for (i=2;i<rows;i++)
{
cout<<"\n";
for (space =1; space <= rows2; space ++)
cout<<"\t";
rows2--;

for (j=0;j<=i;j++)
{
if ( j==0)
{
a[i][j]=1;

}
else if ( i==j)
{
a[i][j]= 1;

}
else
a[i][j] = a[i-1][j-1] + a[i-1][j];

cout<< a[i][j]<<"\t\t" ;

}
}
}

int stop;
cout<<"\n";
cin>>stop;
return 0;

}

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