打印星星三角形的问题

void option (int lineNumber)
{
int mode;
int list;
int star;
int line;
mode = lineNumber % 2;
if(mode = 0)
{
    for(line = 1,list = lineNumber/2;line <= list;line++)
    {
        for(star = 1;star <= line;star++)
        {
            printf("*");
        }
        printf("\n");

    }

    for(line = 1,list = lineNumber/2;line <= list;line++)
    {
        for(star = 1;star <= list+1-line;star++)
        {
            printf("*");
        }
        printf("\n");
    }
  } 
 else
  {

    for(line = 1,list = (lineNumber-2)/2;line <= list;line++)
    {
        for(star = 1;star <= line;star++)
        {
            printf("*");
        }
        printf("\n");
    }

    for(star = 1;star <= (lineNumber+1)/2;star++)
        printf("*");

    for(line = 1,list = (lineNumber-2)/2;line <= list;line++)
    {
        for(star = 0;star <= list-star;star++)
        {
            printf("*");
        }
        printf("\n");
    }
 }
  return;
}

想输出的是形如
*
**
**
*
的图形
但结果不对，不知错在哪里