Question

Here is my code:

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

int main ()  
{
    ifstream fin;

    fin.open("Celsius.txt");

    if (!fin.good()) throw "I/O error";

    double myC;
    fin >> myC;

    fin.close();   

    ofstream fout;
    fout.open("Fahrenheit.txt");
    if (!fout.good()) throw "I/O error";

    double myAnswer = (myC * 1.80) + 32;  
    fixed;  
    cout << myC << " Celsius equals " << setprecision(3) << myAnswer << " Fahrenheit" << endl;  
    fout << myC << " Celsius equals " << setprecision(3) << myAnswer << " Fahrenheit" << endl;  

    fout.close(); 
}

Ok, am I just missing some complete fundamental neuron, I seem to have some road block understanding this.

• It’s -2 for formatted input echo, and
• It’s -2 for not formatting output with one decimal digit.

• Do not format the input values only the output.

  fixed;
  cout << myInput << " should not be formatted, but " << setprecision(3) << myOutput << " should be" << endl;
  

Doesn’t that stay:

myInput is the unformatted input echo
and myOutput is formatted to one decimal digit?

Answer 1

You must include fixed in the output stream, like so:

cout << myC << " Celsius equals " << fixed << setprecision(3) << myAnswer << " Fahrenheit" << endl;

setprecision will specify the number of decimal places after the decimal. So 3 will yeild a number like 72.000, or 1 in your case will set it to 72.0