小数化为分数

#include<iostream>  
#include<stdio.h>  
using namespace std;  

int gcd(int m,int n)  //求公约数 
{  
    int r = 1;
    while(r)
    {
        r = m%n;
        m = n;
        n = r;
    }
    return m;
}  

int main()  
{  
    int a,b,c;  
    cout<<"输入整数部分、不循环部分、循环部分:"<<endl;  
    cin>>c>>a>>b;  
    if(a==0&&b==0)  
        cout<<c;  
    else  
    {  
        int up=c;  
        int down=1;  
        int ta=a;  
        while(ta)  
        {  
            down*=10;  
            ta/=10;  
        }  
        up=c*down+a;  
        if(b!=0)  
        {  
            int wb=1;//确定数目 
            int tb=b;  
            while(tb)  
            {  
                wb*=10;  
                tb/=10;  
            }  
            up=up*(wb-1)+b;  
            down=down*(wb-1);  
        }  
        int fac=gcd(up,down);  
        cout<<up/fac<<"/"<<down/fac<<endl;  
    }  
    return 0;  
}