setting the width

This is a discussion on setting the width within the C++ Programming forums, part of the General Programming Boards category; Code: #include <iostream> using namespace std; void initialize(double [], int); void process (double [], int); void format (void); void display ...

  1. #1
    Un Artiste Extraordinaire volk's Avatar
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    setting the width

    Code:
    #include <iostream>
    using namespace std;
    
    void  initialize(double [], int);
    void  process   (double [], int);
    void  format              (void);
    void  display   (double [], int);
    
    int main()
    {
    	double array[5];
    
    	cout << "Enter five numbers\n" << endl;
    
    	initialize(array, 5);
    
    	process(array, 5);
    
    	format();
    
    	display(array, 5);
    
    	return 0;
    }
    
    void  initialize(double array[], int size)
    {
    	for (register int i = 0; i < size; i++)
    	cin >> array[i];
    }
    
    void  process   (double array[], int size)
    {
    	for (register int i = 0; i < size; i++)
    		array[i] = array[i] * 2;
    }
    
    void  format                        (void)
    {
    	cout.precision(2);
    
    	cout.width(10);
    
    	cout.setf(ios::fixed | ios:: showpoint);
    }
    
    void  display   (double array[], int size)
    {
    	cout << "\nThe numbers doubled are..." << endl;
    
    	for (register int i = 0; i < size; i++)
    		cout << array[i] << endl;
    }
    Why doesn't cout.width(10) work?

    The only way I can get it to work is to change the cout statement in the display function's definition to cout << setw(10) << array[i] << endl;

    I don't want to use that way since it defeats the purpose of having a formatting function, and the setw method requires that I add #include <iomanip>

  2. #2
    C++ Developer XSquared's Avatar
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    AFAIK, setw and width only affect the next piece of data sent to an ostream.
    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

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  3. #3
    Open to suggestions Brighteyes's Avatar
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    I don't want to use that way since it defeats the purpose of having a formatting function
    You could pass the formatting function to display as a function pointer and then use it that way.
    Code:
    void  display(double array[], int size, void (*fmt)())
    {
        cout << "\nThe numbers doubled are..." << endl;
        for (register int i = 0; i < size; i++)
        {
            fmt();  
            cout <<"|"<<array[i] <<"|"<< endl;
        }
    }
    Code:
    display(array, 5, format);
    p.s. What the alphabet would look like without q and r.

  4. #4
    Un Artiste Extraordinaire volk's Avatar
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    Is there a way to do this without pointers?

  5. #5
    Open to suggestions Brighteyes's Avatar
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    Is there a way to do this without pointers?
    Yes, hard code the formatting in your display function. Just for my own curiosity, why is everyone so freaked about using pointers?
    p.s. What the alphabet would look like without q and r.

  6. #6
    Un Artiste Extraordinaire volk's Avatar
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    Pointers are scary.

    I think I saw one stalking me in the streets the other night. *shivers*


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