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Trouble allocating array of structs


Trouble allocating array of structs

By : Kun Shao
Date : October 20 2020, 06:10 AM
around this issue You have a number serious bugs in the posted code.
1) There is missing a }
code :
  struct fracBlock *tempBlock ;  // Single *

  if ( fbp == NULL ){
    tempBlock = malloc(10*sizeof *tempBlock) ;

    //if no more space left
    if ( tempBlock == NULL ) {
      printf( "\nError: No more memory space left for allocation!\n" ) ;
      exit(1) ;
    }

    tempBlock[0].next = tempBlock + 1; // or tempBlock[0].next = &tempBlock[1];
    tempBlock[1].next = tempBlock + 2;
    ...
  if ( fbp == NULL ){
    fbp = malloc(10*sizeof *fbp) ;

    //if no more space left
    if ( fbp == NULL ) {
      printf( "\nError: No more memory space left for allocation!\n" ) ;
      exit(1) ;
    }

    fbp[0].next = fbp + 1;
    fbp[1].next = fbp + 2;
    ...


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Dynamically allocating an array of structs in C

Dynamically allocating an array of structs in C


By : user3103741
Date : March 29 2020, 07:55 AM
This might help you I'm working on a homework assignment for CS1, it's supposed to bring us back up to speed if we had forgotten some of our C (it's mostly about pointers and memory allocation). I've been working on it for well over 15 hours and I am in need of some serious help. , It is supposed to be
code :
fscanf(infile, "%d", &size[index].nums[i]);
fscanf(infile, "%s", &size[index].last[0]);
fscanf(infile, "%s", &size[index].first[0]);
Dynamically allocating an array of structs

Dynamically allocating an array of structs


By : Lacey Wade
Date : March 29 2020, 07:55 AM
it helps some times The player p[numPlayers]; approach calls for a "variable length array". This is a feature which appeared in the GNU C dialect many years ago, and was adopted into the C language in 1999. To get that to compile you need a compiler which recognizes this as an extension, or a C99 compiler. Variable Length Arrays have a downside: they are usually implemented by allocating the memory on the stack. There is no way to detect whether or not there is enough memory.
The malloc calling syntax you have is fine:
code :
player *p=malloc(numPlayers*sizeof(player));
Dynamically allocating array of structs

Dynamically allocating array of structs


By : John Kingsbury
Date : March 29 2020, 07:55 AM
help you fix your problem I have a struct named clients, and i created this array of structs. , Here's one example:
code :
#include <stdlib.h>

typedef struct auxiliarRegistre { ... } clients;

int arrSize = SOME_START_SIZE;
clients *arr = malloc( arrSize * sizeof *arr );

/**
 * Do stuff with arr.  When you need to extend the buffer, do the following:
 */

clients *tmp = realloc( clients, sizeof *arr * ( arrSize * 2));
if ( tmp )
{
  arr = tmp;
  arrSize *= 2;
}
clients *tmp = realloc( clients, sizeof *arr * ( arrSize + extent ));
if ( tmp )
{
  arr = tmp;
  arrSize += extent;
}
Dynamically allocating an array of structs trouble

Dynamically allocating an array of structs trouble


By : JavierEduardo10
Date : March 29 2020, 07:55 AM
hop of those help? The structure I am using is: ,
Why is this happening
code :
Employee* workers = new Employee[11];
Employee workers[11];
Dynamically allocating array of structs C

Dynamically allocating array of structs C


By : Jiri Leflik
Date : March 29 2020, 07:55 AM
wish of those help Code ignores value of products.
What ever readList() receives in products is overwritten with the malloc() call.
code :
void readList(product **products, unsigned int *nr){
    ...
    // bad
    products = malloc((*nr) * sizeof(product*));
    *products = malloc(sizeof *(*products) * (*nr));
    if (*products == NULL) Handle_OOM();
    rowLength = strlen(row);
    // What happens when rowLength == 0
    if (row[rowLength- 1] == '\n'){
      ...
    row[strcspn(row, "\n")] = '\0'; 
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