[wartech]

Hi Everyone!
I have been struggling with a portion of my code. I need help understanding which data type to use to get the correct number output. Your help is appreciated.

ThankS!

#include <iostream>

using std::cin;
using std::cout;
using std::endl;

int main()
{

int num;

 cout << "F) Enter the value 612.14 " << endl;
  cin >> num;
  cout << "" << endl;
  cout << float(num) << endl; // I would like the  value to show as 612.1400
  cout << "" << endl;
  cout << double(num) << endl; // I would like the value to show as 6.1214E+02
  cout << endl;

   system ("Pause");
  return 0;

}

[Xing]

Use double or float.

[wartech]

Xing,
I have tried that but cannot get it to work.
I have also tried different datatypes for the variable "num"

double num;
long num;
float num;

I think that it is a combination of issues such as wrong datatype for the variable "num" and the wrong datatype for the output of "num".

[barnwillyb]

wartech, on 1 Aug, 2007 - 07:52 PM, said:

Xing,
I have tried that but cannot get it to work.
I have also tried different datatypes for the variable "num"

double num;
long num;
float num;

I think that it is a combination of issues such as wrong datatype for the variable "num" and the wrong datatype for the output of "num".

Try reading up on setiosflags.

[BrainStew]

Try something like:

#include <iostream>
#include <iomanip>

using std::cin;
using std::cout;
using std::endl;

int main()
{

int num;

 cout << "F) Enter the value 612.14 " << endl;
  cin >> num;
  cout << "" << endl;
  cout << setprecision(4) << static_cast<float>(num) << endl; // I would like the  value to show as 612.1400
  cout << "" << endl;
  cout << setprecision(4) << static_cast<double>(num) << endl; // I would like the value to show as 6.1214E+02
  cout << endl;

   system ("Pause");
  return 0;

}

you don't need to use the c++ style static_cast, the old c style works fine, but I like it better.

This post has been edited by BrainStew: 02 August 2007 - 07:19 AM

[wartech]

Thanks for the replies.

I stumbled across the answers I was looking for.

cout << "F) Enter the value 612.14 " << endl;
  cin >> num;
  cout << "" << endl;
  cout << fixed << endl; 
  cout << setprecision(5)<< num<< endl;
  cout << "" << endl;
  cout << scientific << endl;
  cout << setprecision(4) << num << endl;
  cout << endl;

This post has been edited by wartech: 02 August 2007 - 08:57 AM