defined values lookup

**peking1983** · 05-19-2005

example pseudo code

Code:

#define red 7

//read in command line argument 'red' into char*

Is there anyway to have 'red' represent 7? The reason I need this is to index into an array from the users command line args and change the value to the next command line arg

**joshdick** · 05-19-2005

Code:

enum Color {RED, BLUE, YELLOW};
const char* color_table[] = {"red", "blue", "yellow"}

unsigned short int input;

cout << "<0> Red" << endl
     << "<1> Blue" << endl
     << "<2> Yellow" << endl
     << endl
     << "Enter your choice: ";
cin >> input;
if(input < 3)
    cout << "You entered " << color_table[input] << endl;

Does that answer your question?

color_table[RED] == "red" and so on.

**quzah** · 05-19-2005

Are you looking for the string "red" to represent 7, or an enumeration?

Code:

enum colors { Red = 7, Orange, Yellow, Green, Blue, Indigo, Violet };

Or you could do something like:

Code:

struct color
{
    char *name;
    int value;
};

...

struct color colorlist[] = 
{
    { "red", 7 },
    { "orange", 3 },
    { "yellow", 27 },
    ...
};

You'll need to be more specific as to what you're looking for.

Quzah.

**peking1983** · 05-19-2005

similar to the enum

Code:

enum colors {orange, yellow, red}

So red is 3 in this case.

Well in the array read in is like:

Code:

arr[red]=(some Object)

so I can read in the word 'red' and then index into the proper position in the array to change the object as needed.

The catch with creating an array like
colarr[] = ("orange","yellow","red")
is that there is roughly 1000 values in the enum for me (it isn't colors but a more complex application and I need to read in values from the command line to change the default Objects in that arr[])

**joshdick** · 05-19-2005

Write a program to write the code necessary for a const array containing the 1000 values.

**CornedBee** · 05-19-2005

I usually use the preprocessor:

Code:

// data.h
ENTRY(red, 1)
ENTRY(blue,2)
ENTRY(green,3)

// stuff.c
#define ENTRY(s,i) s = i,
enum colors
{
#include "data.h"
};
#undef ENTRY

void add(HLOOKUPTABLE tbl, const char *name, int value);

void initTable(HLOOKUPTABLE tbl)
{
#define ENTRY(s,i) add(tbl, #s, i);
#include "data.h"
#undef ENTRY
}

etc.

**quzah** · 05-19-2005

Boy, that's horrible to read.

Quzah.

**CornedBee** · 05-19-2005

It works. Mozilla uses that, just for example.

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