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Top Forums Programming C programming working with multidimensional array Post 302297499 by shamrock on Friday 13th of March 2009 03:25:09 PM
Old 03-13-2009
Quote:
Originally Posted by littleboyblu
ok, it works fine. thanks very much. Could you explain me why
Code:
y(float **pf){}

is not correct and in which cases i have to use it?
float **pf is not correct because it is a pointer to pointer to float i.e. dual level pointer while each element of the array table is a pointer to an array of floats...
Code:
x()
{
  float x;      /* x is a variable of type float */
  float *pf;    /* pf is a pointer to float */
  float **ppf;  /* ppf is a pointer to pointer to float */

  pf = &x;      /* pf now points to x */
  ppf = &pf;    /* ppf now points to pf */
}

 

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transforms(3U)						    InterViews Reference Manual 					    transforms(3U)

NAME
MoveCmd, RotateCmd, ScaleCmd - coordinate transformation commands SYNOPSIS
#include <Unidraw/Commands/transforms.h> DESCRIPTION
The Unidraw library predefines three purely interpretive commands for performing coordinate transformations: MoveCmd defines a translation, RotateCmd defines a rotation, and ScaleCmd defines a two-dimensional scaling. MOVECMD PUBLIC OPERATIONS
MoveCmd(ControlInfo*, float dx = 0, float dy = 0) MoveCmd(Editor* = nil, float = 0, float = 0) Construct a new MoveCmd, specifying the translation distances in the horizontal (dx) and vertical (dy) dimensions. void GetMovement(float&, float&) Return the translation distances specified in the constructor. ROTATECMD PUBLIC OPERATIONS
RotateCmd(ControlInfo*, float = 0) RotateCmd(Editor* = nil, float = 0) Construct a new RotateCmd, specifying the rotation angle in degrees. float GetRotation() Return the rotation angle specified in the constructor. SCALECMD PUBLIC OPERATIONS
ScaleCmd( ControlInfo*, float sx = 1, float sy = 1, Alignment = Center ) ScaleCmd(Editor* = nil, float = 1, float = 1, Alignment = Center) Construct a new ScaleCmd, specifying the scaling factors in the horizontal (sx) and vertical (sy) dimensions and an alignment sug- gesting the point about which the component should be scaled. void GetScaleing(float&, float&) Alignment GetAlignment() Return the scaling factors and alignment specified in the constructor. SEE ALSO
Command(3U) Unidraw 24 January 1991 transforms(3U)
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