学了2天的C语言，编的一个输出*的程序，请大家多多指导

susan-12242003 · 发表于 2010-8-5 09:44:18

#include <math.h>
#include <stdio.h>

int print_stars(int num);
int print_spaces(int num);

int main()
{
int i, j;
int n, m;

begin:
printf("input:\n");
scanf("%d", &n); //n = 5
if (n < 0 || n % 2 == 0)
{
      printf("error, exit\n");
      return -1;
}
getchar();

for (i = 1; i <= (n + 1) / 2; i++)
{
      print_spaces((n + 1) / 2 - i);
      print_stars(i);
}

for (i = (n + 1) / 2 - 1; i >= 1; i--)
{
      print_spaces((n + 1) / 2 - i);
      print_stars(i);
}

getchar();
goto begin;
}

int print_stars(int num)
{
int i;
for (i=1; i<=num; i++)
{
      printf("* ");
}
printf("\n");
}

int print_spaces(int num)
{
int i;
for (i=1; i<=num; i++)
{
      printf(" ");
}
}