Assertion Error C
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Assertion Error Android Studio
up Debug assertion failed . while using fscanf up vote 2 down vote favorite Hey I've tried a lot of programs in Visual Studio and in most of them when i try taking the input from a stream ( while using fscanf ) it invariably throws a debug assertion failed error .. and goes on to say: stream != NULL. Since I assertion error in java have gotten this error a number of times .. I assume there is a flaw in the way I'm using fscanf. I would appreciate it if someone could tell me the usage or .. give me a demo sample code that illustrates the simple usage .. ! I tried looking up the error .. in most places it said I haven't closed the file .. but I have and I'm a little confused .. I appreciate any help .. thanks a lot :) printf("Enter No of states\n"); Q=5; // scanf("%d",&Q); // READING ZERO MATRIX // reading the matrix from f0.sta { FILE *fp; fp = fopen("c:\\tc\\fuzzy\\f0.sta","r"); for(i=1;i<=Q;i++) for(j=1;j<=Q;j++) fscanf(fp,"%f",&a0[i][j]); fclose(fp); } // READING ONE MATRIX // reading the matrix from f0.sta FILE *fp; fp = fopen("c:\\tc\\fuzzy\\f1.sta","r"); for(i=1;i<=Q;i++) for(j=1;j<=Q;j++) fscanf(fp,"%f",&a1[i][j]); fclose(fp); This is the code bit. c debugging fscanf assertion share|improve this question edited Jan 3 '12 at 18:46 Mysticial 281k35238263 asked Jan 3 '12 at 7:52 abhishek b 3128 Can you put your code here, to let us see how did you try to use the given function? There is no point of descri
a cut from some notes I once wrote for a C programming course. Assertions An assertion specifies that a program satisfies certain conditions assertion error processing at particular points in its execution. There are three types of assertion:
Assertion Error In Java Example
Preconditions Specify conditions at the start of a function. Postconditions Specify conditions at the end of a function. Invariants
Assertion Error Matlab
Specify conditions over a defined region of a program. An assertion violation indicates a bug in the program. Thus, assertions are an effective means of improving the reliability of programs-in http://stackoverflow.com/questions/8709320/debug-assertion-failed-while-using-fscanf other words, they are a systematic debugging tool. In this document, I mainly consider preconditions, and invariants not at all. (This will need to be fixed - hjr.) Assertions in C In C, assertions are implemented with the standard assert macro. The argument to assert must be true when the macro is executed, otherwise the program aborts and prints an error message. http://ptolemy.eecs.berkeley.edu/~johnr/tutorials/assertions.html For example, the assertion assert( size <= LIMIT ); will abort the program and print an error message like this: Assertion violation: file tripe.c, line 34: size <= LIMIT if size is greater than LIMIT. Preconditions Preconditions specify the input conditions to a function. Here is an example of a function with preconditions: int magic( int size, char *format ) { int maximum; assert( size <= LIMIT ); assert( format != NULL ); ... These pre-conditions have two consequences: magic is only required to perform its task if the pre- conditions are satisfied. Thus, as the writer of magic, you are not required to make magic do anything sensible if size or format are not as stated in the assertions. The caller is certain of the conditions under which magic will perform its task correctly. Thus, if your code is calling magic, you must ensure that the size or format arguments to the call are as specified by the assertions. Consider the following analogy. Suppose you (the function) are employed as an apple-packer. One of the conditions of your contract is that the tempera
written to the standard error device and abort is called, terminating the program execution. The specifics of the message shown depend on the particular library implementation, but it shall http://www.cplusplus.com/reference/cassert/assert/ at least include: the expression whose assertion failed, the name of the source http://cboard.cprogramming.com/c-programming/22267-assertion-failure.html file, and the line number where it happened. A usual expression format is: Assertion failed: expression, file filename, line line number This macro is disabled if, at the moment of including
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/* assert example */ #include
Programming Boards C Programming Assertion Failure Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get a compiler | Fixes for common problems Thread: Assertion Failure Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 07-23-2002 #1 JagWire Guest Assertion Failure Anyone know what an assertion failure is? My program is supposedly crashing from it and I have no idea why. 07-23-2002 #2 quzah View Profile View Forum Posts ATH0 Join Date Oct 2001 Posts 14,826 An assertion failure is... welll... I'll let a search engine tell you. Basicly that sums it up. 'assert' is a macro used to cause your program to bomb out. In a nut shell, it's this: if( something == 0 ) exit( 0 ); Quzah. Hope is the first step on the road to disappointment. 07-24-2002 #3 BigIndian View Profile View Forum Posts Registered User Join Date Jul 2002 Posts 4 Hey quzah, thanks for answering JagWire's question. I actually had the same problem, but my return is -1 and not 0. I'm sure JagWire had an error message that popped up similar to this: Debug Assertion Failed! Program: C:\My Documents\...\Debug\project1.exe File: fgets.c Line: 60 Expression: str !=NULL For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. I was wondering if you had any further tips/suggestions. i'll be reading the search results you posted as well. I didn't have as much luck when I querried Google as you did. 07-24-2002 #4 BigIndian View Profile View Forum Posts Registered User Join Date Jul 2002 Posts 4 I've isolated the code that is giving me problems: Code: if(fgets(hex2, 45, fp) == NULL) { /* No more lines to read*/ #ifdef VARIED_LENGTH_STRINGS copy = malloc (strlen (hex2)+1); if (copy != NULL) { free (copy); copy = NULL; } // end if #else strcpy (copy, hex2); Callback(copy); #endif } //end if the first line seems to be where my debugger starts acting funny. Any suggestions? I haven't been able to find anything I can understand and/or use in the search results. 07-24-2002 #5 Crimpy View Profile View Forum Posts Registered User Join Date Jul 2002 Posts 66 An assertion failure is when something that shouldn't happen does. Like passing a NULL pointer to fgets as the buff