a c program to generate pascal using array

#include <stdio.h>
#include <conio.h>
#include <math.h>

int main()
{
    int i,j,k,rows,columns;
    int a[100][100]={0};
   
    printf("Enter the value rows :");
    scanf("%d",&rows);
     
  
   
    for(i=1;i<=rows;i++)
    {
                     for(j=1;j<=i;j++)
                     {
                                         if(j==1||j==i)
                                         {a[i][j]=1;
                                         }
                                         else
                                         {a[i][j]=a[i-1][j-1]+a[i-1][j];}
                                        
                                         }
                    
                    
                                 
    }
    for(i=1;i<=rows;i++)
    {
                     for(j=1;j<=i;j++)
                     {printf("%d ",a[i][j]);
                     }
                     printf("\n");
    }
    getch();
    return 0;
}