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;
}