75_pascal_triangle.c

#include <stdio.h>
int fact(int);
int combi(int, int);
void printPascal(int);

int fact(int n)
{
        int f = 1;
        while (n >= 1)
        {
                f = f * n;
                n--;
        }
        return (f);
}
int combi(int n, int r)
{
        return (fact(n) / fact(n - r) / fact(r));
}
void printPascal(int line)
{
        int i, j, k, r;
        for (i = 1; i <= line; i++)
        {
                k = 1;
                r = 0;
                for (j = 1; j <= 2 * line - 1; j++)
                {
                        if (j >= line + 1 - i && j <= line - 1 + i && k)
                        {
                                printf("%2d", combi(i - 1, r));
                                k = 0;
                                r++;
                        }
                        else
                        {
                                printf("  ");
                                k = 1;
                        }
                }
                printf("\n");
        }
}
int main()
{
        int a;
        printf("Enter no of rows ");
        scanf("%d", &a);
        printPascal(a);
        return 0;
}