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How to append new value at the beginning of string?

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janet

Joined: 17 Feb 2004
Posts: 23

How to append new value at the beginning of string?

Posted: Tue Mar 16, 2004 2:56 am

let's say

Code:

BYTE random_value;
BYTE random_string[10];
BYTE data_string[] = "";

for (i = 0; i < 10; i++) {
random_value = rand();
sprintf(random_string, "%u", random_value);
strcat(data_string, random_string);
next;

every new data will be appended at the end of the string.
the string will contain "random_value0 random_value1 random_value2 ..."

What if i want to reverse the order of value in the string so that new value will be appended at the BEGINNING of the string?

the end result i want to get is "random_value9 random_value8 random_value7 ... random_value0"

Cheers

Ttelmah
Guest

Re: How to append new value at the beginning of string?

Posted: Tue Mar 16, 2004 3:20 am

janet wrote:

let's say

Code:

BYTE random_value;
BYTE random_string[10];
BYTE data_string[] = "";

for (i = 0; i < 10; i++) {
random_value = rand();
sprintf(random_string, "%u", random_value);
next;

every new data will be appended at the end of the string.
the string will contain "random_value0 random_value1 random_value2 ..." strcat(data_string, random_string);

What if i want to reverse the order of value in the string so that new value will be appended at the BEGINNING of the string?

the end result i want to get is "random_value9 random_value8 random_value7 ... random_value0"

Cheers

It'd be better (in terms of speed), to think again, and perhaps store the strings 'backwards'. You can append at the beginning, by doing:
strcat(random_string, data_string);
strcpy(data_string, random_string);

However you do it though, if you actually need to end up with th data stored this way, there will be a lot of data movement involved, since you have to shift the entire string in memory to make the space.

Best Wishes

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