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  #1  
Old October 10th, 2002, 11:29 PM
jakobie jakobie is offline
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Splitting a Variable

I know this is going to end up turning into something really simple but...

I have a variable with the year 2002. I need to print it as both 2002 and 02. How can I only print the last two digits of a variable?


Thank you
Jake

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  #2  
Old October 11th, 2002, 01:26 AM
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Assuming you have the variable in a char array, you can always offset or increment a char pointer by 2 positions something like this:
Code:
char *date = "2002";

printf("Long date is %s\n", date); /* Prints 2002 */

/* Offsetting the pointer by 2 positions. *date still points to 2002 */
printf("Last two digits are %s\n", date+2); /* Prints 02. */ 

/* Increment char pointer by 2 characters */
date += 2; /* Now *date points to "02" */
printf("Last two digits are %s\n", date); /* Prints 02 */

Hope this helps

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Old October 11th, 2002, 08:00 PM
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well if its not in a character array, you could always just mod the number by 1000
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Old October 13th, 2002, 10:39 PM
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The whole Modulus thing doesn't work if 1999 is put in, you get 999. If you put in 2002 you get 2. How would I offset in C++. I tried strncpy but I got an error. I was trying to do like,
Code:
strncpy(two, four, 2)


thats not the same one, there was a different one where before the amount of characters you could specify on which character to start coping on.

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Old October 13th, 2002, 11:06 PM
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mod 100

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Old October 14th, 2002, 11:49 AM
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I'm thinking the Mod method would be too big of a pain. 100 works but. If the year is 200X you get one number, not the two.

I tried incrementing a char pointer, and well, I got 52 and 51 for 2005 and 1999.

Thanks guys.

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Old October 14th, 2002, 01:20 PM
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Quote:
I tried incrementing a char pointer, and well, I got 52 and 51 for 2005 and 1999.


That's odd. Are you sure you're increasing the pointer, and not something else?

Anyway, here's an example program that generates a random year between 1900 and 2100, and prints it out both long and short:

Code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>


int
main (int argc, char **argv)
{
        int year;
        char s[5];

        srand(time(NULL));

        year = 1900 + rand() % 200;

        /* convert integer to string */
        snprintf(s, sizeof(s), "%4d", year);

        printf("%s\n", s);

        /* skip past the first two digits */
        printf("%s\n", s + 2);
}


Hope this helps.
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Old October 14th, 2002, 01:47 PM
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Quote:
Originally posted by jakobie
100 works but. If the year is 200X you get one number, not the two.

It's an int, so that's just a question of output formatting.
Code:
printf( "%d02", year % 100 );


HTH

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Old October 14th, 2002, 03:33 PM
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if(( year % 100) < 10) cout << "0" << year % 100;

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