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Bus Error C Array


Well in isolation, there is nothing wrong with the code per se, so my guess is some other malloc/free mistake elsewhere in the code is the cause, and this is just FILE *file; file = fopen("words.txt","r"); //Check to make sure file can open if(file == NULL) { printf("Error: File does not open."); exit(1); } //Otherwise, read file into array else { while(!feof(file))//The The routine returns the number of bytes read. White Sep 18 '11 at 1:04 I tried formatting as much as possible, but i really dont know how to have them aligned. –sethu Sep 18 '11 at 1:07

No methods. Likewise, since it does not match the tag of any declared byte, we have no idea where it came form or why it contains 0x45." End quote -- thanks, Jay! But the great error is that you put the final condition !feof(), whichout checking that the limit of the string array gives overflow. Forum Today's Posts C and C++ FAQ Forum Actions Mark Forums Read Quick Links View Forum Leaders What's New?

Bus Error 10 C++

You can do this either statically (on the stack) or dynamically (using malloc). It is in id5.c: #include #include struct intdouble { int i; double d; }; main() { struct intdouble id1, id2; id1.i = 5; id1.d = 3.14; id2 = id1; Why is nuclear waste more dangerous than the original nuclear fuel? You try to print out a double as an int.

  • You also have at least one memory leak (line 98,99, Answer = ...) and I can only assume other errors, but I stopped looking after that. –WhozCraig Dec 6 '14 at
  • It also helps you understand memory and what is going on with your machine while programs are running.
  • Who created the Secret Stairs as a way into Mordor and for what purpose?
  • It might seem to work today, on your compiler, but it is not legal C or C++, and there is no guarantee that it'll still work the next time you run
  • Will I still get the error now?
  • Finally, we print out the array.
  • There are two problems with that: you are overwriting the value everytime a new string is read and the buffer is in the stack, and is invalid once the function returns.
  • I recommend Kernighan&Ritchie's The C Programming Language, see also.
  • We'll explore this more soon.

There could be other problems with your code. But when its 7 X 7, it returns "Bus Error: 10", and if the size is 12 x 12, it returns "Segmentation Fault : 11". What is the role of conjectures in modern mathematics? Bus Error 10 Mac Finally, you're trying to copy the strings using =.

share|improve this answer answered Oct 17 '08 at 14:57 Mark Baker 3,66211823 1 My i7 certainly has an MMU, but I still came across this error while learning C on Again, you'll see the reason why later, but you should be aware of this kind of bug now, since you may well see it again. Browse other questions tagged c arrays function bus-error or ask your own question. The users who voted to close gave this specific reason:"Questions concerning problems with code you've written must describe the specific problem — and include valid code to reproduce it — in

We'll discuss this below: Pointers Pointers are where most people mess up in C. Bus Error Vs Segmentation Fault It is equivalent to const char *str = "I am a good boy", i.e. Segmentation Violations and Bus Errors Memory can be viewed as a giant array of bytes. When you try to access an inaccessible element, you generate a segmentation violation, and your program dumps core so that you can debug it.

Linux Bus Error Core Dumped

But if I rewrite the same code as: int main(void) { char *str; str="I am a good boy"; int i,j; char temp; int len=strlen(str); char *ptr=NULL; ptr=malloc(sizeof(char)*(len)); ptr=strcpy(ptr,str); for (i=0, j=len-1; When we run it, we get: UNIX> p3 ip = 0xefffe924. Bus Error 10 C++ Moreover, you cannot take the address of an array variable -- saying ``&j'' is illegal. Bus Error Linux Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are typically the result of: using a pointer to something that was deallocated.

At age 25, is it still okay to wear braces to work? The error I get is simple. Half of the game in getting things right in C is keeping yourself from being confused about types. You can force our machines to do that with the compilation flag "-m32", and the program works well. How To Solve Bus Error In Linux

The compiler does not shuffle around the fields so that they pack into memory better. I am going to try this once I get my program working the current way I have it. Segmentation Violations and Bus Errors Memory can be viewed as a giant array of bytes. Don't be sorry about messy code, clean it up, this will help you to understand it yourself. –Jens Gustedt Dec 6 '14 at 22:51 Hard to get a bus-error

Two tails in a row - what's the probability that the game started with a head? Sigbus int *r[] = {0} it's equivalent with int *r[1]; share|improve this answer answered Sep 9 '13 at 7:54 Silent Control 398417 add a comment| up vote 0 down vote r is To fix this, you need to allocate a character array that you can modify.

share|improve this answer edited Oct 20 '12 at 16:16 md5 17.5k22071 answered Jun 26 '12 at 8:51 Vinaya Sagar 171 Heh...if this were the case, you'd have BUS error

It will instead hold the lowest order byte of i, which is 16 (0x10). So you cannot append a string literal to another simply, because they are not meant to be modifyable. The next element will be sizeof(type) bytes after the pointer. Abort Trap 6 The mmap spec says that: References within the address range starting at pa and continuing for len bytes to whole pages following the end of an object shall result in delivery

build 5659) Copyright (C) 2007 Free Software Foundation, Inc. From: Here share|improve this answer answered Oct 17 '08 at 14:54 Oli 93.1k45160228 Depends on the nasty tricks you're doing with your code. Why? They are more complex than scalars.

So, it is aligned. Some type castings, like the one above, are very natural. For example, elements 0 to 0x1000 are inaccessible. Thus, when we set s2 to i, it fills in the missing four bytes with ones, making s2 negative.

This is called ``type casting''. Should I be concerned about "security"? For example, look at the following program (in p3.c): main() { int i; char j[14]; int *ip; char *jp; ip = &i; jp = j; printf("ip = 0x%x. You have a type-mismatch error with int **realArrayPointer = v;.

Join them; it only takes a minute: Sign up Bus error when appending to C array up vote 0 down vote favorite I'm running into a bus error trying to do Is Dark Matter called "Matter" only because of gravity? low-memory conditions or out of huge pages when using huge page memory.) Typically mmap (and malloc) just reserve the virtual address space, and the kernel assigns the physical memory on demand It then sets the pointers so that they point to the memory allocated for i and j.

Coworkers quitting under special circumstances -- should telling our manager be one of my options? Also, see the pointers section from this tutorial –pb2q Jul 30 '12 at 19:55 | show 1 more comment up vote 2 down vote You are passing the value 5049 for For example, if i is an (int *), then if i is not a multiple of 4, dereferencing i will be an error. share|improve this answer answered Dec 7 '14 at 5:17 JS1 4,4361615 Thank you so much for taking the effort.

Structs The second way to aggregate data is with a struct. This is how I create a GraphP: Code: GraphP newGraph(int length) { GraphP newGraph = (GraphP)malloc(sizeof(GraphP)); /* Initialize other variables of newGraph. */ newGraph->nodes = (NodeP*)calloc(length, sizeof(NodeP)); NodeP testNode = newNode(); It is the only part of C where you can copy an unspecified number of bytes with an assignment statement. share|improve this answer edited Sep 18 '11 at 1:20 answered Sep 18 '11 at 1:05 Ray Toal 49.5k989135 I thought trying to write read-only memory would cause a segfault,