How to add additional character in multiple places of an array string

newinubuntu · 05-07-2015, 09:38 AM

Hii

I am a beginner of C++ programming environment.
My question:

Quote:

Suppose there is a array..and the contents of the array="ironman"
Now, i need to insert some additional character to this string like "i*ro#n@m^a!n"

I have written a code which concatenate at the end of the string, but i want to concatenate between the string
MY code:

Quote:

#include <iostream>
#include <string>

int main()
{
char in[20] = "ironman";
const unsigned int symbol_size = 5;
std::string symbols[symbol_size];
std::string out(in);
out = out + "@" + "*" + "#";

std::cout << "Output "" << out << ""\n";
}

Output:

Quote:

ironman@*#

Also i need to reversely generate the original contents. That means from "i*ro#n@m^a!n" to "ironman"..

Also i have one constraint, i cannot use much of library function..i can use loop only.

Thanks in Advance !!

grail · 05-07-2015, 11:12 AM

Well the usual question, what have you done and where are you stuck? You will not learn much if you simply ask for the answer.

newinubuntu · 05-07-2015, 11:37 AM

I m not looking for a readymade codes..i just need the logic..its a usual question..but i have some constraints over it.
Also i am not writing a simple C++..i am going to modify a ns2 module and it just a function. Thats why, i m posting it here.

I updated my post..so kindly check it once..Please i am very new to field..
So help me out !!!

Thankx !!

grail · 05-08-2015, 01:29 AM

So you created some variables ... good start. Where is the loop you mentioned to cycle through each character in your array (string) to then allow you to build the new array with the additional
characters?

sundialsvcs · 05-08-2015, 08:02 AM

One thing you'll want to do, right away, is to slurp the values from that character-array (which now contains "ironman") into a true C++ string type. Do your subsequent manipulations using that string. Then, after checking to be sure that the output buffer is large enough to hold the value (and a terminating \0 byte!), transfer the finished string back into that buffer.

If you can't use regular-expressions and so forth, then you'll basically be taking substring-slices from one string, which is your "source," and concatenating them into another string, which will become your "final result." This string will be the one that you copy back into your result buffer, after verifying its size as aforesaid. You do nothing-at-all with that buffer between the time that you slurp the existing value from it and when you pour the result back into it.

The procedure is, "a bit tedious, yes, but entirely straightforward."

(Generally, in C++, there is very little use for "a fixed-size array-of-char." Use the string type, instead. It's faster, more efficient, has no size constraints, can understand Unicode, and so on.)