Thread: converting a string to array

Could you give a little bit more description to what you are trying to achieve please, like a sample input, and sample output.
There are however a few problems with your snippet above,
You saying you need to read from a file containing a string of char but here:

fin >> test;

you are actually trying to read the string to the file. From your description, I assume that the file must already contain the characters you need.

for (int i =0; i <= characters; i++)
{

fout << inputArray[];
}

What is the block above suppose to achieve, since your inputArray[] is empty?

Originally Posted by Servalsoft

Could you give a little bit more description to what you are trying to achieve please, like a sample input, and sample output.
There are however a few problems with your snippet above,
You saying you need to read from a file containing a string of char but here:

you are actually trying to read the string to the file. From your description, I assume that the file must already contain the characters you need.


What is the block above suppose to achieve, since your inputArray[] is empty?

The file contains a string of characters, for example, "actgtcat".
Sorry for not being clear. I want to assign a value for each character For example, reading a string of "aatcgatatcg", and assigning the character 'a' to a value of 5, or assigning a value of 'c' to a value of 2, which I would then add up somehow, so a string value would eventually add up to 1838, or something. I would have to split the string into separate charcters right? Or am I speaking nonsense?
I'm starting to get a sense of how to accomplish this, but I'll have to experiment some more with actually coding it.
And sorry about that block of code, it was born out of frustration, and running out of ideas, I forgot to take it out. It's not part of anything, and doesn't really do anything. Actually, i think it gives an error message anyways.

Since the char 'a' already has a numerical value (97) why can't you use that number?

Code:

#include <iostream>

int main()
{
    char myChar = 'a';
    std::cout << myChar << " " << static_cast<int>(myChar) << std::endl;
    // OR
    int myInt = myChar
    std::cout << myChar << " " << myInt << std::endl;

}

Jim

Right. Is there a way to assign it a value though, treating it as a variable?

Sounds like you need something like this:

Code:

#include <map>

std::map<char, int> codes;
codes.insert( std::make_pair('a', 5) );
codes.insert( std::make_pair('c', 2) );
codes.insert( std::make_pair('g', 3) );
codes.insert( std::make_pair('t', 7) );

codes['a'] // == 5

Or use a vector of pairs, or whatever you are comfy with. You should error check the insert function, though.

Originally Posted by jtieu

Right. Is there a way to assign it a value though, treating it as a variable?

I suggest you use what Jim mentioned above, if you google "ascii" table you will see the numerical value for most ascii characters, and then you can just perform your addition as normal, as the characters will be automatically casted to their decimal values.
I think this is the easiest way to go, unless the assignment is specific about assigning the values.
I hope this helps.
Yan

Hmm, alright, maybe I can modify it after I find the numeric value for each char. I'm going to try screwing around with the code for a little while longer anyways.
Thanks everyone for putting up with my incompetence. I'll post a solution as soon as I get one in case anyone else cares.

Im sure some people do, I'd certainly like to see your final approach.
Happy coding