Format...iomanip?

[The Hobo]

I have a series of double variables, that can be anything from 0.00, to 000.00. What I want is to add leading zeros so that they all line up:

From:
$ 5.66
$ 12.12
$ 122.42

to something like:
$ 005.66
$ 012.12
$ 122.42

or better yet, a way to do:

$   5.66
$  12.12
$ 122.42

(forums messed up the spacing, sorry)

any ideas?

[jim mcnamara]

You want this in C?
try:

void lpad(char *src, char *dest, int *length){
        char *buf;
        char *s;
        memset(dest,0x0, (size_t) length +1);
        memset(dest,0x20,(size_t) length);
        buf = src;
        buf += strlen(src);
        s = dest;
        s+= length;
        while((int) buf >= (int) src){
                     *s-- = *buf--;
        }
        return;
}

[The Hobo]

Not sure I follow this?

[jim mcnamara]

This is an example of how to blank-fill something.

You convert a number to a char like this:

void tochar(float src, char *dest){ // convert a float to a char
   sprintf(dest,"%f",src);
}

This left pads a char to a given length

void lpad(char *src, char *dest, int *length){ // fill in leading blanks
        char *buf;  // char pointer
        char *s;
        memset(dest,0x0, (size_t) length +1);  // initalize the destination
        memset(dest,0x20,(size_t) length);
        if (strlen(src)>=length){
              strcpy(dest,src);// the src is >= length
        }
        else{  // src neds to be padded.
         buf = src; // start at the beginning of the source string
         buf += strlen(src); // go to the end
         s = dest; // start at the beginning
         s+= length; // go to the end of the source
         while((int) buf >= (int) src){
                     *s-- = *buf--; // stuff all the 
         }                          // source chars into the dest
        }                           // working back to front
        return;
}

usage:

float f;
char *buf;
char result[20];
 memset(result,0x00,sizeof(result);
 f = 18.3 * 4;
 tochar(f,result);
 lpad(result,19);
 result[0]='$';
 printf("%s\n",result);