CODEWITHSUNDEEP
c++carraysmultidimensional-array
MaxSteel
MaxSteel

Reputation: 259

initialize character array on the fly

I want to initialize a char array using pointers, on the fly.That is user giving input do not know the size of array.User keeps on giving input until return is pressed.Condition here is to:

Upvotes: 0

Views: 869

Answers (2)

cnicutar
cnicutar

Reputation: 182649

Assuming a C question, how about (untested):

char *arr = malloc(10);
size_t size = 10, index = 0;
int ch;
while ((ch = getc(stdin)) != EOF && ch != '\n' && ch != '\r') {
    if (index >= size) {
        size *= 2;
        arr = realloc(arr, size); /* XXX check it first. */
    }
    arr[index++] = ch;
}
arr[index] = 0;

If it's really a C++ question you want std::getline with a std::string.

Upvotes: 3

Ivaylo Strandjev
Ivaylo Strandjev

Reputation: 70939

The std::string has a method push_back also std::vector would do the job. Still if you are REALLY forced to use a dynamic array and char pointers I would advice you to implement reallocation strategy similar to the one used in vector - double the size each time the number of elements is more then the current size.

Upvotes: 0

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