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Copying a string into a dynamical two-dimensional array


Copying a string into a dynamical two-dimensional array

By : user2949048
Date : November 16 2020, 06:23 AM
Hope that helps like the title already states I would like to copy various strings into a two-dimensional array. Each string has a different size therefore I need to use memory reallocation. The code below should do this job, but somehow I cannot get it working. , One problem is in the reallocation:
code :
str = realloc(str,str_num*sizeof(char));
str = realloc(str,str_num*sizeof(char*));
str[str_num-1] = realloc(str,strlen(str_new));
str[str_num - 1] = strdup(str_new);


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passing a returned pointer of a dynamical two-dimensional array to a sub-function and addressing the array

passing a returned pointer of a dynamical two-dimensional array to a sub-function and addressing the array


By : Tushar
Date : March 29 2020, 07:55 AM
hope this fix your issue My issue is the following: I am making a pointer to a dynamic two dimensional array on the heap. This is done in a subfunction "Production" which fills in the elements of the table (array) and returns the pointer of the array to the main(). There I want to give the pointer as a parameter for another function "PrintTable"; which cout's the table. My issue is that the returned pointer is actually a one dimensional array (c++) and I don't know how to adress it to get the second row of the array.. Let me try to explain it to you: , This is your problem:
code :
int** productionTable=new int*[num1];
...
return* productionTable;
Copying a two dimensional array - still uses references?

Copying a two dimensional array - still uses references?


By : Emil Grønhøj Carlsen
Date : March 29 2020, 07:55 AM
help you fix your problem Java uses shallow copies. That is, you get a copy but it isn't what you want here. You want a deep copy. Try manually copying each element into returnList and see what happens.
Another way to solve this is to make your move, recurse, then unmake the move. Then you don't need to copy the array at all.
Creating N-dimensional dynamical array based on user's input?

Creating N-dimensional dynamical array based on user's input?


By : Attila Kalló
Date : March 29 2020, 07:55 AM
this one helps. An ASCII file has 61 columns, from which the columns are read using readlines(). The user has the option to specify how many columns to use to create an n-dimennsional array based on his/her choice of number of columns.
code :
>>> rows = 486
>>> columns = 5
>>> A = [[None] * columns for x in xrange(rows)]
>>> len(A)
486
>>> len(A[0])
5
Copying a Multi-Dimensional Array in C

Copying a Multi-Dimensional Array in C


By : C. cray
Date : March 29 2020, 07:55 AM
will be helpful for those in need Problem 1:
You have the wrong indexes when calling scanf. Use i,j, not x,y:
code :
    scanf("%lf" ,&source[i][j]);
void copy_arr(int x, int y, double source[x][y], double target[x][y]) {
    memcpy(target, source, x*y*sizeof(double));
}
Error while copying string to 2 dimensional character array

Error while copying string to 2 dimensional character array


By : user2601176
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Your code as you posted it in your question should compile correctly.
You probably want this:
code :
  ...
  strcpy(khdev->m_Name[i],ptr);
  khdev->m_Name[i][tmp.size() + 1] = '\0';    // don't forget the terminating 0 
  i++ ;
} 
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