Codeforces B. Nearest fraction running result is inconsistent with codeblocks running result. Please advise

Http://codeforces.com/problemset/problem/281/ B

My code for this question is:

#include<cstdio>#include<cmath>using namespace std;long long int gcd(long int a,long int b){    return a==0?b:gcd(b%a,a);}int main(){    long long int x,y,n,mina,minb;    while(scanf("%I64d%I64d%I64d",&x,&y,&n)!=EOF)    {        int temp=gcd(x,y);        x/=temp;        y/=temp;        if(n>=y)        {            printf("%I64d/%I64d\n",x,y);            continue;        }        for(int i=1; i<=n; i++)        {            int a1=x*i/y;            int a2=a1+1;            if(i==1)            {                mina=a1;                minb=i;            }            if(fabs(a1*1.0/i-x*1.0/y)<fabs(mina*1.0/minb-x*1.0/y))            {                mina=a1;                minb=i;            }            if(fabs(a2*1.0/i-x*1.0/y)<fabs(mina*1.0/minb-x*1.0/y))            {                mina=a2;                minb=i;            }        }        temp=gcd(mina,minb);        printf("%I64d/%I64d\n",mina/temp,minb/temp);    }    return 0;}

I use the codeblocks compiler and input 1/1 and output. However, after submitting the code on CF, the output is as follows:

How should I change the program?