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Using strcpy_s() and strcat_s() with dynamically allocated strings


Using strcpy_s() and strcat_s() with dynamically allocated strings

By : Georgi Danchev
Date : October 22 2020, 06:10 PM
Hope this helps In the following code, I try to create a function that gets a dynamically allocated string. The function will ask the user to input another string that will also be dynamically allocated. Finally, you will allocate another large string to which the initial string will be copied, followed by the second string. , strcpy_s(tempstr, oldSize, *theStr);
should be
code :


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Dynamically allocated C array of strings

Dynamically allocated C array of strings


By : user3389209
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can not malloc an array of class objects, because this function does not invoke any constructors. You just get memory filled with garbage, which you then try to reinterpret as an array of class objects.
Arrays of C++ objects are allocated with new[].
Dynamically allocated strings in C

Dynamically allocated strings in C


By : komlan setodji
Date : March 29 2020, 07:55 AM
I hope this helps you . If you have the option of using C++ (as you mentioned), that is going to make your life a lot easier. You can then use a STL string (std::string) which manages dynamically sized strings for you. You can also drop the old scanf() beast and use std::cin.
Example:
code :
#include <iostream>
#include <string>

void main()
{
    std::string sInput;
    std::getline(std::cin, sInput);

    // alternatively, you could execute this line instead:
    // std::cin >> sInput;
    // but that will tokenize input based on whitespace, so you
    // will only get one word at a time rather than an entire line
}
Qsort of dynamically allocated array of dynamically allocated strings by string length

Qsort of dynamically allocated array of dynamically allocated strings by string length


By : Keren Raiter
Date : March 29 2020, 07:55 AM
This might help you From the C11 Standard (draft) on the qsort() function (emphases by me):
code :
int compare(const void* a, const void* b) {
  return strlen((char*)a) - strlen((char*)b);
}
int compare(const void * pv1, const void * pv2) {
  char * ps1 = *(char **) pv1;
  char * ps2 = *(char **) pv2;

  return strlen(ps1) - strlen(ps2);
}
int compare(const void * pv1, const void * pv2) {
  char ** ppc1 = pv1;
  char ** ppc2 = pv2;

  return strlen(*ppc1) - strlen(*ppc2);
}
   strings[i]=(char*)malloc(sizeof(char*));
   strings[i] = malloc(sizeof(char));
   strings[i] = malloc(1);
   strings[i] = malloc(N + 1); /* 1+ for the 0-terminator. */
  scanf("%s", strings[i]);
  scanf("%20s", strings[i]);
strcat_s after strcpy_s gives Error

strcat_s after strcpy_s gives Error


By : Saurabh Tripathi
Date : March 29 2020, 07:55 AM
will help you strlen(hello) is the wrong string length, respectively it's complete garbage at that time since hello isn't even initialized yet.
The expression strlen(stringOne) + strlen(stringTwo) + 1 which you had used to allocate the target buffer would had been the appropriate length to pass.
Array of dynamically allocated strings

Array of dynamically allocated strings


By : Uur Kiminsu
Date : March 29 2020, 07:55 AM
I hope this helps you . The short and useless summary is: you're #includeing string.h; use it!
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