关于简单处理文本中 所有数都乘以10000 为什么我的程序总是报错

#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    ifstream infile( "1.txt" );
    ofstream outfile( "2.txt" );
    if( !infile || !outfile )
    {
        cerr << "open 1.txt error!\n";
        return 1;
    }
    int b;
    float a[62];
    for(int i;float a[i];i++)
    {
        cin.get(a[i]);
        b=a[i]*1000000;
        outfile.put(b);   
    }
    cout<<endl;
}