Why does this code result in an empty file?-CodePudding

After I run this code the file "balances.txt" contains no data. Maybe I am misunderstanding how fstream works or I'm confused about the flow direction?

//
#include<fstream>
#include<iostream>
#include<string>
using namespace std;

int main()
{
    fstream bank_file;

    bank_file.open("balances.txt", fstream::app);
    int count = 0;
    float number = 0.0;
    for (bank_file >> number; count < 100; bank_file >> number)
{
    bank_file << number << endl;
    number  ;
    count  ;
    cout << number << endl;
    
}
   bank_file.close();

CodePudding user response：

To write the numbers 1 to 100 in the file, replace the for loop in your example with the following:

for( int number = 1; number <= 100;   number)
{
    bank_file << number << "\n";
}

Note that there are good reasons not to use floating point numbers to represent bank balances. Chief among these is rounding error.

CodePudding user response：

Try this one.

#include<fstream>
#include<iostream>
#include<string>
using namespace std;

int main()
{
    fstream bank_file;

    bank_file.open("balances.txt", fstream::app);
    int count = 0;
    float number = 0.0;
    for (count= 0; count <= 100; count  )
        {
            bank_file << number << endl;
            cout << number << endl;
            number  ;
            
        }
   bank_file.close();
}