Oh almost forgot. share|improve this answer answered Oct 2 '08 at 19:51 Jurney 34438 add a comment| up vote 1 down vote // create a string constant like this - will be read only Yeah, I shouldn't have learnt C before C++ TheIndependentAquarius View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by TheIndependentAquarius View Blog 04-29-2011, 11:10 Instead of new/delete, I'd recommend to use stl containers, when possible - containers free memory automatically and are more flexible. http://wx2me.com/segmentation-fault/segmentation-error-in-c.php
Hide this message.QuoraSign In Code Debugging Computer Programming Advice Personal QuestionWhen I get a "segmentation fault (core dumped)" error in a program, generally what should I guess happened and practically how By changing the definition of name_1 to, say, char name_1, you ensure that there are twenty bytes of space for the string. –Jonathan Leffler Nov 27 '12 at 7:05 1 The Open Group Base Specifications Issue 6 signal.h v t e Operating systems General Advocacy Comparison Forensic engineering History Hobbyist development List Timeline Usage share Kernel Architectures Exokernel Hybrid Microkernel Monolithic And, that's how you usually scanf: double x_initial; /* initial guess */ scanf("%lf",&x_initial); /* Read the initial guess. */ For example, see how 'idum' is used below: long idum = http://stackoverflow.com/questions/164194/why-do-i-get-a-segmentation-fault-when-writing-to-a-string-initialized-with-cha
Got me confused for a few moments... –David Refaeli Sep 13 at 8:30 add a comment| 17 Answers 17 active oldest votes up vote 139 down vote accepted See the C What does "Game of the Year" actually mean? Last edited by dwhitney67; 04-29-2011 at 05:39 AM. 1 members found this post helpful.
In fact, that is what is intended in the vast majority of these cases. You are currently viewing LQ as a guest. share|improve this answer answered Oct 2 '08 at 19:54 Michael Burr 241k31358577 add a comment| up vote 2 down vote String literals like "string" are probably allocated in your executable's address C Segmentation Fault 11 Would you like to answer one of these unanswered questions instead?
System Calls From C Code What to do with my pre-teen daughter who has been out of control since a severe accident? C++ String Segmentation Fault How to slow down sessions? char a = "string literal"; char *p = "string literal"; My program crashes if I try to assign a new value to p[i]. dwhitney67 View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by dwhitney67 04-30-2011, 08:15 AM #13 SigTerm Member Registered: Dec 2009 Distribution: Slackware
You also passed a char ** (namely &name_1) to scanf() with a %s format which expects to be given a char *. How To Remove Segmentation Fault In C Well, sorry, that won't work. On Unix-like operating systems, a signal called SIGSEGV (abbreviated from segmentation violation) is sent to the offending process. Examples are listed below.
By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. http://web.mit.edu/10.001/Web/Tips/tips_on_segmentation.html No; on most real systems these days it will crash if char *name_1 = NULL; is passed to scanf(), but the behaviour is undefined and the runtime can do anything it C++ String Causes Segmentation Fault Forgetting to use "&" on the arguments to scanf: Function scanf takes as arguments the format control string and the addresses of variables in which it will place the data that What Is A Segmentation Fault In C The read-only part is the important part, and is why the @Mark's first code example segfaults.
When written as an array, the compiler places the initialized string data in the data segment instead, which is the same place that your global variables and such live. http://wx2me.com/segmentation-fault/segmentation-error.php Draw an hourglass Why is international first class much more expensive than international economy class? C99 N1256 draft There are two completely different uses of array literals: Initialize char: char c = "abc"; This is "more magic", and described at 6.7.8/14 "Initialization": An array of character This seg fault is always associated with the pointer variable that i am using. C Segmentation Fault Core Dumped
At the hardware level, the fault is initially raised by the memory management unit (MMU) on illegal access (if the referenced memory exists), as part of its memory protection feature, or Dousti Aug 11 '14 at 19:31 Its funny - but this actually compiles and runs perfectly when using windows compiler (cl) on a visual studio developer command prompt. share|improve this answer answered Jan 3 '13 at 19:03 Raghu Srikanth Reddy 2,02372035 add a comment| up vote -3 down vote Well the soltuion is malloc() char *p; p=malloc(sizeof(char)*size);/*size of the click site I'm trying to make a linked-list of 20 nodes.
If you attempt to use reinterpret_cast<> or static_cast<>, then a warning would be generated. How To Debug Segmentation Fault For example, processes do not have access to the page of memory beginning at
0x0 and thus dereferencing the NULL pointer results in a segmentation fault.Most of good C programming How could a language that uses a single word extremely often sustain itself?
When i am trying to provide string input for the two values i am getting a seg fault. Contact Us - Advertising Info - Rules - LQ Merchandise - Donations - Contributing Member - LQ Sitemap - Main Menu Linux Forum Android Forum Chrome OS Forum Search LQ The key idea, however, is that all segment faults are caused by accessing memory that your program doesn't own.37.1k Views · View Upvotes · Answer requested by Gami Nipulkumar Anhad Jai Scanf Segmentation Fault I.e.
This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. You're not wasting the space (though the second code fragment certainly uses more); you're using it. As for avoiding direct calls to "new", I'd would like to see an example where one could allocate an object without using "new" (or "malloc" family of functions). navigate to this website Only by allocating a space, i can use the code.? –Rajan Chennai Nov 27 '12 at 6:49 By allocating space to array?
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