C Program:
#include<stdio.h>
#include<conio.h>
long factorial(int);
main()
{
int i, n, c;
printf("Enter the number of rows you wish to see in pascal triangle\n");
scanf("%d", &n);
for (i = 0; i < n; i++)
{
for (c = 0; c <= (n - i - 2); c++)
printf(" ");
for (c = 0; c <= i; c++)
printf("%ld ", factorial(i) / (factorial(c) * factorial(i - c)));
printf("\n");
}
getch();
}