Double variable problem...

I need to send the variable (double) into the function as a char*

Code:

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void changecolor(char* word, int color){
        textcolor(color);                  //changes text to the color given through the argument
        cprintf("%s", word);                      //outputs the string in the given color
        textcolor(LIGHTGRAY);        //change color back to the default light gray
} //end void changecolor

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tried this:

Code:

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  char* mon;
  mon = (char)monthly_interest;
        changecolor(mon, color);

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monthly_interest is a double?? why? what did I go wrong? thanks!

i dont know why you would want to cast a double to a char *, but heres how you do it...
(char *)&monthly_interest

>> (char)monthly_interest;
Typecasting your double to a char will do no good. You need to convert it to a string first.

>> (char *)&monthly_interest
That will not do it either. In the function he passed it to, he's printing it as a string. So he'll need to convert the float to a string.

EDIT - if you're still having trouble, I suggest you look at the sprintf function

Quote:

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Originally posted by *ClownPimp*
i dont know why you would want to cast a double to a char *, but heres how you do it...
(char *)&monthly_interest

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I tried and it s garbled if I use that way.

Basically, I just need a way to input a variable, and send it to that function and have it output in the color I choose..

Thanks for response :)

void changecolor(char* word, int color){
textcolor(color); //changes text to the color given through the argument
cprintf("%s", word); //outputs the string in the given color
textcolor(LIGHTGRAY); //change color back to the default light gray
} //end void changecolor --------------------------------------------------------------------------------


tried this:


code:------------------------------------------------------------------------ char* mon;
mon = (char)monthly_interest;
changecolor(mon, color);



++++++++++++++++++++

I believe the person is using that function to output both text and variables if sent in as arguments, like if he went changecolor("Word", 1); or changecolor(variable, 1), it'd still do the same.

BTW how WOULD you do that?

>> BTW how WOULD you do that?
Actually the changecolor function's first parameter is char* which points to a string of characters. So you just convert all your variables to a string before passing it to the function.

How would you change a given datatype into a string before passing it?

Quote:

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Originally posted by Nakeerb
How would you change a given datatype into a string before passing it?

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Thats one I want to know! lol..

You shoud've read my suggestions then and tried them out. But since you can't seem to do that here's a sample:

Code:

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#include <stdio.h>

void printString(char *blah)
{
  printf("%s\n", blah);
}

int main()
{
  double x = 6.925;
  char bleh[20];

  sprintf(bleh, "%f", x);
  printString(bleh);

  return 0;
}

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Now that wasn't too hard :D

Nm this post

I should say, it does work, but

Code:

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        cout.setf(ios::showpoint);
        cout.setf(ios::fixed);
        cout.precision(2);

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something that that won't work on it

Actually i think it is impossible to do that because it is a string, you can't "round a string", lol.

Not sure what you're saying. But you can't mix those statements with printf. Use cout instead. You now know how to convert a variable to a string so I don't see what the problem is.

with cout you can use precision, for instance if you had a double n = 4.553535 and used the cout.precision(2), outputting that variable would make it 4.55, but you CANNOT do this with a string

There's no functions to set precision for a string. However you CAN still do it manually. Instead of printing the string, print character by character until:

1) you've reached the end of the string '\0'
2) or until you've reached a '.' then print 2 more characters after that if you want a precision of 2

Code:

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void changecolor(char* word, int color){
        int index = word.find(word, ".") ;

        if (index != -1){
                index += 3;
               
                if (word[index] >= '5'){
                        index--;
                        word[index]++;
                        index++;
                }
               
                word[index] = '\0';
               
        }
       
        textcolor(color);                  //changes text to the color given through the argument
        cprintf("%s\n", word);                      //outputs the string in the given color
        textcolor(LIGHTGRAY);        //change color back to the default light gray
} //end void changecolor

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like so?