In c++ what should i use

rahulvishwakarma · 08-08-2010, 06:08 AM

#include<iostream>
#include<cstdio>
using namespace std;

main()
{
char *pch = new char[21];

snprintf(pch,11,"rahul");

/* what expession I should use in place
of snprintf in c++.
*/
cout<<pch<<endl;

delete pch;
return 0;
}

Sergei Steshenko · 08-08-2010, 07:13 AM

Quote:

Originally Posted by rahulvishwakarma

#include<iostream>
#include<cstdio>
using namespace std;

main()
{
char *pch = new char[21];

snprintf(pch,11,"rahul");

/* what expession I should use in place
of snprintf in c++.
*/
cout<<pch<<endl;

delete pch;
return 0;
}

'snprintf' expects a format string, doesn't it ? So, what is wrong with 'snprintf' as a function and why do you want a replacement for it in C++ ?

How about

man 3 snprintf

first ?

dugan · 08-08-2010, 12:22 PM

Code:

#include<iostream>
using namespace std;

main()
{
  string str = "rahul";
  cout << str << endl;
  return 0;
}

paulsm4 · 08-08-2010, 12:24 PM

Hi -

1. This was your original (C) code, which crashed with a segmentation fault:
http://www.linuxquestions.org/questi...2/#post4056869

Code:

/*
  hey dude error in gnu c pointer please solve this
  I am using Red Hat Enterprise Linux 5.0.
 */
#include <stdio.h>
#include <stdlib.h>

int main()
{
  char * cp = NULL;
  cp = (char*)malloc(11);
  cp = "abcdefgh";
  printf(" cp = %s \n",cp);
  free(cp);
  return 0;

2. This was my response (to your C) question:
http://www.linuxquestions.org/questi...2/#post4056910

Code:

/*
 * Hey, dude - Movie recommendation
 */
...
  // 1) Declare character pointer - good!
  char * cp = NULL;

  // 2) Allocate space to hold up to 10 characters - good!
  cp = (char*)malloc(11);

  // 3) Assign a static string to the pointer.
  //    OK .. but you just undid step 2).  Why?
  //    And you just ORPHANED your allocated block - bad.  Memory leak!
  cp = "abcdefgh";

  // 4) Print the string - OK
  printf(" cp = %s \n",cp);

  // 5) Free the string - bad!
  //    cp now points to the static string - NOT the allocated block!
  free(cp);
...

3. And this is my response to your new, C++ only question:

Code:

#include<iostream>
#include<string>
using namespace std;

main()
{
  string s = "rahul";
  cout << s <<  endl;
  return 0;
}