分数化为小数

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int a,b,c,m,x;
    cin >> a >> b >> c;
    cout << a/b << ".";
    while(c!=1)
    {
        a = (a%b)*10;
        cout << a/b;
        c--;
    }
    a = (a%b)*10;
    x = a/b;
    m = (a%b)*10/b;
    if(m>5)
    {
        x++;
    }
    cout<<x;
    return 0;
}