将FOR改成WHILE 怎么改 帮帮忙

#include<stdio.h>
main()
{
int i,j,a,b;
i=0;
while(i<5)
{j=1;
while(j<5-i)
{printf(" ");j++;}
a=1;
while(a<=2*i+1){printf("*");a++;}
printf("\n");
i++;}
i=1;
while(i<5)
{j=1;
while(j<=i)
{printf(" ");j++;}
a=1;
while(a<=9-2*i){printf("*");a++;}
printf("\n");
i++;}
}

上面变量要三个 精简了一下我最少也必须两个；
不知道有没有高手继续精简的
#include<stdio.h>
main()
{
int i,j;
i=1;
while(i<=5)
{j=1;
while(j<6-i)
{printf(" ");j++;}
j=1;
while(j<=2*i-1){printf("*");j++;}
printf("\n");
i++;} i=1;
while(i<5)
{j=1;
while(j<=i)
{printf(" ");j++;}
j=1;
while(j<=9-2*i){printf("*");j++;}
printf("\n");
i++;}
}