manipulate string c++

[redx]

void addition::print_output()
{
    cout << "Enter value : ";
    getline(cin,store);
}

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here my problem,
for e.g : if user enter value like this
123,456,789,764,345 or 123456789764345
then i would like to convert to this for e.g :
block[0] = 345
block[1] = 764
block[2] = 789
block[3] = 456
block[4] = 123

i just don't know how to start write this function.
-----------------------------------------------------------------------
my private in class :

    private: 
        string store;
        int block[];

-----------------------------------------------------------------------

int addition::manipulate()
{
    // i guess it would involve if..else and for loop.
}

-----------------------------------------------------------------------

i just need an example.. :(
please help.
thank you.

[Ganon11]

Well, you need to have a few things:

1) I assume the length of the number that the user enters can vary. If so, you need a way to determine how many digits there are in the input number. This total, divided by 3, is how many slots your array will require.

2) You need a way of seperating each 3-digit sequence from the rest of the number. Use modulus division to get the sequence, then integer division to truncate the number.

3) A variable to keep track of which array slot is being filled. You could use the index of a for loop, but the nature of your problem suggests a while loop. In this case, you need a seperate variable, starting at 0 and incrementing to the max number needed.

If the length does not vary (see point 1), then the problem is simple! This means that the user will always enter a 15 digit number, you will always need an array of length 5, you will execute step 2 exactly 5 times, etc. etc.

[redx]

thanks for your reply.
i know how to do step one,
store.length().
then divide 3..

but, i stuck in step 2. i dont know how to seperate ?

sory.. and thanks again.

[hariharanmca]

thanks for your reply.
i know how to do step one,
store.length().
then divide 3..

but, i stuck in step 2. i dont know how to seperate ?

sory.. and thanks again.

seperate string

I think this page will guid you