关于for循环---可以将讲解一下这个程序的循环流程吗？

#include "stdio.h"

#include "math.h"

void main()

{

float s,j;

int i,q,g;

char *a[]={"壹","贰","叁","肆","伍","陆","柒","捌","玖"};

char *b[]={"元","十","百","千","万","十万","百万","千万","亿"};

char *d[]={"角","分"};

scanf("%f",&s);

s=s+0.003;

for(i=8;i>0;i--)

{j=s/pow(10,i);

if(j!=0)

break;

}

for(q=i-1;q>=0;q--)

{j=s/pow(10,q);

g=(int)j%10;

if(g!=0)

printf("%s%s",a[g-1],b[q]);}

for(q=-1;q>=-2;q--)
{

j=s/pow(10,q);

g=(int)j%10;

if(g!=0)

printf("%s%s",a[g-1],d[-q-1]);}


求讲解详细一点！！！！！！！
尤其是关于for循环，感谢各位！！！！！