pascals triangle in c

pascal.c

/*
 *--------------------------------------
 * Program Name: pascal
 * Author:       vaino
 * Description:  pascals triangle
 *--------------------------------------
*/

#include <stdio.h>
#include <string.h>

int fac(int n)
{
    if (n <= 1)
        return 1;
    
    return fac(n - 1) * n; 
}

int choose(int n, int r)
{
    return fac(n)/(fac(n - r) * fac(r));
}


int main(void)
{
    int levels;
    scanf("%d", &levels);

    for (int i = 0; i < levels; i++)
    {
        char temp[50] = "";
        for (int j = 0; j < (i + 1); j++)
        {
            char t[5];
            sprintf(t, "%d ", choose(i, j));
            strcat(temp, t);
        }
        printf("%s\x0A", temp);
    }
    return 0;
}

pascal_ti84.c

/*
 *--------------------------------------
 * Program Name: pascal
 * Author:       vaino
 * Description:  pascals triangle
 *--------------------------------------
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tice.h>
#include <keypadc.h>

#define INPUT_SIZE  10


int fac(int n)
{
    if (n <= 1)
        return 1;

    return fac(n - 1) * n; 
}

int choose(int n, int r)
{
    return fac(n)/(fac(n - r) * fac(r));
}


int main(void)
{
    char iter_c[INPUT_SIZE];

    os_ClrHome();

    os_GetStringInput("iter? ", iter_c, INPUT_SIZE);
    int iter = atoi(iter_c);

    for (int i = 0; i < iter; i++)
    {
        char temp[100] = "";
        for (int j = 0; j < (i + 1); j++)
        {
            char t[100];
            sprintf(t, "%d ", choose(i, j));
            strcat(temp, t);
        }
        printf("%s\n", temp);
    }

    while (!os_GetCSC());
    return 0;
}