C语言之while输出菱形

//用while 实现菱形的输出
#include<stdio.h>
void main()
{
	int i,j,k;
	int m,n,f;
	i=1;
	while(i<10)
	{   j=1;
		while(j<11-i)
		{
			printf(" ");
			j++;
		}
	    k=1;
		while(k<=2*i-1)
		{
			printf("*");
			k++;
		}
		i++;
		printf("\n");
	
	}
	f=1;
   while(f<10)
   {   m=1;
	   while(m<=f)
	   {
		   printf(" ");
		   m++;
	   }
	   n=1;
      while(n<=19-2*f)
	  {
	   printf("*");
  	   n++;
	  }
       f++;
       printf("\n");
	   
   }
   
}