C语言，输出杨辉三角

#include "stdio.h"

#include "stdlib.h"

void yanghui_num(int * yanghui, int n);

int yh_one_num(int n, int i);

int main(void)

{

int n;

int
i,j;

printf("请输入要输出杨辉三角的行数：");

scanf("%d",
&n);

char *
space = (char *)malloc(sizeof(char) * (n * 2 + 1));

if(space ==
NULL)

exit(1);

for(i = 0; i
< n * 2; i++)

*(space + i) = ' ';

*(space + i)
= '\0';

int *
yanghui = (int *)malloc(sizeof(int) * (n + 1));

for(i =
0; i < n; i++)

{

yanghui_num(yanghui, i);

printf("%s", space + i * 2);

for(j = 0; j <= i; j++)

printf("- ",
*(yanghui + j));

printf("\n");

}

free(space);

free(yanghui);

space =
NULL;

yanghui =
NULL;

return
0;

}

void yanghui_num(int * yanghui, int n)

{

int i;

for(i = 0; i
<= n; i++)

*(yanghui + i) = yh_one_num(n, i);

}

int yh_one_num(int n, int i)

{

int
numerator = 1, denominator = 1;

int j;

if(i ==
0)

return 1;

for(j = 0; j
< i; j++)

{

numerator *= (n - j);

denominator *= (j + 1);

}

return
numerator / denominator;

}