C 语言 用字符输出菱形图案的函数(可自定义边长及字符样式)

#include <stdio.h>

void BuildRhombus(int i,char c,char s)
{
int num = i * 2 - 1;  //the all lines
int x = 0,y = 0,k = 0;
for(int a = 0 ;a < num;a ++)
{
if(a < (i-1))
{
x = i - a;
y = i + a;
}
else
{
x = a - i + 2;
y = i + a - k;
k += 2;
}
for(int b = 1;b <= num ;b++)
{
if( b == x || b == y)
printf("%c",c); //输出"笔"的字符
else
printf("%c",s); //输出间隔的字符
}
printf("\n");  //每行后记得换行
}

}
int main()
{
BuildRhombus(8,'*','-');
}