Repeating Decimals UVA - 202

#include<cstdio>
#include<cstring>
char  a[6000];
int b[6000];
int main()
{
	int n,m;
	while(scanf("%d%d",&n,&m)!=EOF)
	{
		int f=0;
		int count1=0,cur=0;
		int s=n/m;
		int u=(n%m)*10;
		int i=0;
		a[i++]='.';
		while(i<6000)
		{
			if(f==1)break;
			if(u/m==0)
			{
				b[i]=u;
				a[i++]='0';
				u=u*10;
				//printf("%d",u);
			}
			else
			{
				b[i]=u;
				a[i++]='0'+u/m;
				u=(u%m)*10;
			}
			for(int k=1;k<i-1;k++)
			{
				if(b[i-1]==b[k])
				{
					f=1;
					count1=i-1;
					cur=k;
					//printf("%d ",b[k]);
					break;
				}
			}
		}
		a[i]='\0';
		
		printf("%d/%d = %d",n,m,s);
		int r1=0;
		for(int k=0;k<i-1;k++)
		{
			if(r1==51){printf("...");break;
			}
			if(cur==k)printf("(");
			printf("%c",a[k]);
			r1++;
		}
		printf(")\n");
		printf("   %d = number of digits in repeating cycle\n\n",count1-cur);
	}
	return 0;
}