pascals_traingle.c

#include <stdio.h>

long long fact(long long num)
{
    long long factorial=1;
    while(num>0)
    {
        factorial=factorial*num;
        num--;
    }

    if (num==0)
    {
        return factorial;
    }
}

long long combination(long long n, long long r)
{
    long long c;
    c=fact(n)/(fact(r)*fact(n-r));
    return c;
}

void main()
{
    int lines;
    printf("Enter number of lines in the triangle: ");
    scanf("%d", &lines);

    for (int i = 0; i <= lines; i++)
    {
        printf("  ");
    }
    
    if (lines>=1) printf(" 1\n");   

    for (int i = 1; i < lines; i++)
    {
        long temp=0;
        for (int s = 0; s < lines-i; s++)
        {
            printf("  ");
        }
        while (temp <= i)
        {
            printf("% 4lld", combination(i,temp));
            temp++;
        }
        printf("\n");      
    }
}