inputed by user string in dynamic array

[alexgit]

Hello,

I want to write a program that takes inserted by user string (any characters plus spaces) in new dynamic multi-dimensional array (any row is word).
In other words, I want to divide strings on words and work with it later.

#include <iostream>
#include <cstring>

using namespace std;

int main() {
        //array that consists of characters from user-entered string
        char *cArrInput = new char[0];

        cin.getline(cArrInput,256);    
//the question is: how to replace code line above to avoid definition of entered string length (only user knows it)
        cout << cArrInput << endl;

        //array of words
        char *cArrWords = new char[0];
        int **iArrWordsCounter = new int(0);
        while(*iArrWordsCounter < strlen(cArrInput) ) { 
                cArrWords[*iArrWordsCounter] = new int[0];
        };  

        delete cArrInput[];
        delete cArrWords[];
        *iArrWordsCounter = 0;
        while(*iArrWordsCounter < strlen(cArrInput) ) { 
                delete cArrWords[];
        };  
        delete iArrWordsCounter; 
        return 0;
}

compilers error:

program.cpp: In function ‘int main()’:
program.cpp:15:36: error: cannot convert ‘int*’ to ‘int**’ in initialization
  int **iArrWordsCounter = new int(0);
                                    ^
program.cpp:16:44: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while(*iArrWordsCounter < strlen(cArrInput) ) {
                                            ^
program.cpp:17:30: error: invalid types ‘char*[int*]’ for array subscript
   cArrWords[*iArrWordsCounter] = new int[0];
                              ^
program.cpp:20:19: error: expected primary-expression before ‘]’ token
  delete cArrInput[];
                   ^
program.cpp:21:19: error: expected primary-expression before ‘]’ token
  delete cArrWords[];
                   ^
program.cpp:23:44: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while(*iArrWordsCounter < strlen(cArrInput) ) {
                                            ^
program.cpp:24:20: error: expected primary-expression before ‘]’ token
   delete cArrWords[];

Can someone help?

[alexgit]

cin.getline requires a number of inserted characters - but it couldnt be known beforehand.

[Texan40]

  int *iArrInputSize = new int(0);

iArrInputSize has not been initialized. The integer value it points to could be anything.

  char *cArrInput = new char[*iArrInputSize];

because iArrInputSize is unknown, this array is also. Could allocate any number of bytes or no bytes at all.

Consider this:

  int iSize;    // what value is iSize?
  char *cArray = new char[iSize];  // what size is cArray? 

Vs:

  int iSize = 5; // Value of iSize is 5.
  char *cArray = new char[iSize]; // cArray can hold 4 characters and a null terminator 

[alexgit]

int *iArrInputSize = new int(0);

This mean "create new pointer to int and link it to cells that mean number 0". So, array cArrInput is initialized.

[Texan40]

Ah sorry, totally missed that 0; So you want to take input from user for how big the array will be or do you just want the user to add items and expand the array dynamically?

[alexgit]

Thanks for answer,

I want to write a program that takes inserted by user string (any characters plus spaces) in new dynamic multi-dimensional array (any row is word).
In other words, I want to divide strings on words and work with it later.

[Texan40]

Are you required to use dynamic arrays or can you use std::vector?

[alexgit]

For some reasons I couldnt use vector header.
I had updated the first post. And I think for better convenience I will constantly update my code in my first post.

Now the question is: how to replace cin.getline(cArrInput,256); to avoid definition of entered string length (only user knows it).

[Texan40]

You can't. You have to tell cin.getline the maximum number of characters it can expect to find before the /n character (user presses enter).

[alexgit]

Maybe there is way to count entered by user characters?