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Full Discussion: C++ Segmentation error with bi-dimensional array
Top Forums Programming C++ Segmentation error with bi-dimensional array Post 302624603 by Corona688 on Monday 16th of April 2012 12:59:06 PM
Old 04-16-2012
Quote:
Originally Posted by nmset
I would have preffered that rubbish code doesn't get compiled at all, a compiler is supposed to be a non-tolerant tool.
Well, that's the thing -- it's not always rubbish. The compiler makes few assumptions about your system. It's supposed to be used in many more situations than just generic user-mode code -- you can make bootloaders out of it for instance, and even entire operating systems. It just does what you tell it to.

So the compiler doesn't second-guess you. It'll let you make a 3-gigabyte stack array on the assumption you wouldn't have asked for it if it weren't possible...

Variables inside array size descriptions is nonsense though. Some compilers it works, some compilers it doesn't, some compilers it crashes. I get the impression it might be interpreting the values you put in as something other than the literal values of the integers themselves -- their addresses perhaps.
 

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LEARN ABOUT CENTOS

clacpy

clacpy.f(3)							      LAPACK							       clacpy.f(3)

NAME

       clacpy.f -

SYNOPSIS

   Functions/Subroutines
       subroutine clacpy (UPLO, M, N, A, LDA, B, LDB)
	   CLACPY copies all or part of one two-dimensional array to another.

Function/Subroutine Documentation
   subroutine clacpy (characterUPLO, integerM, integerN, complex, dimension( lda, * )A, integerLDA, complex, dimension( ldb, * )B, integerLDB)
       CLACPY copies all or part of one two-dimensional array to another.

       Purpose:

	    CLACPY copies all or part of a two-dimensional matrix A to another
	    matrix B.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		     Specifies the part of the matrix A to be copied to B.
		     = 'U':	 Upper triangular part
		     = 'L':	 Lower triangular part
		     Otherwise:  All of the matrix A

	   M

		     M is INTEGER
		     The number of rows of the matrix A.  M >= 0.

	   N

		     N is INTEGER
		     The number of columns of the matrix A.  N >= 0.

	   A

		     A is COMPLEX array, dimension (LDA,N)
		     The m by n matrix A.  If UPLO = 'U', only the upper trapezium
		     is accessed; if UPLO = 'L', only the lower trapezium is
		     accessed.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,M).

	   B

		     B is COMPLEX array, dimension (LDB,N)
		     On exit, B = A in the locations specified by UPLO.

	   LDB

		     LDB is INTEGER
		     The leading dimension of the array B.  LDB >= max(1,M).

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 104 of file clacpy.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       clacpy.f(3)
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