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Full Discussion: Divide by zero script
Top Forums Shell Programming and Scripting Divide by zero script Post 302848197 by jefferj54 on Wednesday 28th of August 2013 05:57:18 PM
Old 08-28-2013
Divide by zero script
Hi,

I've been working on a few scripts and have been getting great info.
How, would I include in the below script, how I would let a user know that if they divide a SECOND number by zero, that they would get a divide by zero error? What's the easiest way of working this?

Cordially,
joe.

I think I asked this and didn't get a viable answer before. 'Trying again.

Example: If 5 / 0 -( "0" is second number), A divide by zero error warning would be included in the script.

Script:
Code:
echo "Enter a number."
read num1
echo "Enter another number."
read num2
div=$((num1 / num2))
echo "div=$div"

Last edited by Scott; 08-29-2013 at 01:24 AM.. Reason: Code tags - again; and double post - closed
 

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LEARN ABOUT CENTOS

glblendequationseparate

GLBLENDEQUATIONSEPAR(3G)					   OpenGL Manual					  GLBLENDEQUATIONSEPAR(3G)

NAME

       glBlendEquationSeparate - set the RGB blend equation and the alpha blend equation separately

C SPECIFICATION

       void glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha);

       void glBlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeAlpha);

PARAMETERS

       buf
	   for glBlendEquationSeparatei, specifies the index of the draw buffer for which to set the blend equations.

       modeRGB
	   specifies the RGB blend equation, how the red, green, and blue components of the source and destination colors are combined. It must be
	   GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN, GL_MAX.

       modeAlpha
	   specifies the alpha blend equation, how the alpha component of the source and destination colors are combined. It must be GL_FUNC_ADD,
	   GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN, GL_MAX.

DESCRIPTION

       The blend equations determines how a new pixel (the ''source'' color) is combined with a pixel already in the framebuffer (the
       ''destination'' color). These functions specifie one blend equation for the RGB-color components and one blend equation for the alpha
       component.  glBlendEquationSeparatei specifies the blend equations for a single draw buffer whereas glBlendEquationSeparate sets the blend
       equations for all draw buffers.

       The blend equations use the source and destination blend factors specified by either glBlendFunc() or glBlendFuncSeparate(). See
       glBlendFunc() or glBlendFuncSeparate() for a description of the various blend factors.

       In the equations that follow, source and destination color components are referred to as R s G s B s A s and R d G d B d A d, respectively.
       The result color is referred to as R r G r B r A r. The source and destination blend factors are denoted s R s G s B s A and d R d G d B d
       A, respectively. For these equations all color components are understood to have values in the range 0 1.

       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |			     |							   |							 |
       |			Mode |			       RGB			   |			     Alpha			 |
       |			     | Components					   | Component						 |
       |			     |							   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |GL_FUNC_ADD		     | <div>						   | <div>						 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Rr		   |				     Ar 		 |
       |			     |				       =		   |				     =			 |
       |			     |							   |							 |
       |			     |						    R	   |						  A	 |
       |			     |						    s	   |						  s	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |						  s	 |
       |			     |						    R	   |						  A	 |
       |			     |							   |							 |
       |			     |						    +	   |						  +	 |
       |			     |						    R	   |						  A	 |
       |			     |						    d	   |						  d	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |						  d	 |
       |			     |						    R	   |						  A	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |			     </div>			 |
       |			     |			       <div>			   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Gr		   |							 |
       |			     |				       =		   |							 |
       |			     |							   |							 |
       |			     |						    G	   |							 |
       |			     |						    s	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |							 |
       |			     |						    G	   |							 |
       |			     |							   |							 |
       |			     |						    +	   |							 |
       |			     |						    G	   |							 |
       |			     |						    d	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |							 |
       |			     |						    G	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |							 |
       |			     |			       <div>			   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Br		   |							 |
       |			     |				       =		   |							 |
       |			     |							   |							 |
       |			     |						    B	   |							 |
       |			     |						    s	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |							 |
       |			     |						    B	   |							 |
       |			     |							   |							 |
       |			     |						    +	   |							 |
       |			     |						    B	   |							 |
       |			     |						    d	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |							 |
       |			     |						    B	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |GL_FUNC_SUBTRACT	     | <div>						   | <div>						 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Rr		   |				     Ar 		 |
       |			     |				       =		   |				     =			 |
       |			     |							   |							 |
       |			     |						    R	   |						  A	 |
       |			     |						    s	   |						  s	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |						  s	 |
       |			     |						    R	   |						  A	 |
       |			     |							   |							 |
       |			     |						    -	   |						  -	 |
       |			     |						    R	   |						  A	 |
       |			     |						    d	   |						  d	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |						  d	 |
       |			     |						    R	   |						  A	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |			     </div>			 |
       |			     |			       <div>			   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Gr		   |							 |
       |			     |				       =		   |							 |
       |			     |							   |							 |
       |			     |						    G	   |							 |
       |			     |						    s	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |							 |
       |			     |						    G	   |							 |
       |			     |							   |							 |
       |			     |						    -	   |							 |
       |			     |						    G	   |							 |
       |			     |						    d	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |							 |
       |			     |						    G	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |							 |
       |			     |			       <div>			   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				       Br		   |							 |
       |			     |				       =		   |							 |
       |			     |							   |							 |
       |			     |						    B	   |							 |
       |			     |						    s	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    s	   |							 |
       |			     |						    B	   |							 |
       |			     |							   |							 |
       |			     |						    -	   |							 |
       |			     |						    B	   |							 |
       |			     |						    d	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						    d	   |							 |
       |			     |						    B	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |			       </div>			   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |GL_FUNC_REVERSE_SUBTRACT     | <div>						   | <div>						 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Rr		   |					 Ar		 |
       |			     |					   =		   |					 =		 |
       |			     |							   |							 |
       |			     |							 R |						       A |
       |			     |							 d |						       d |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 d |						       d |
       |			     |							 R |						       A |
       |			     |							   |							 |
       |			     |							 - |						       - |
       |			     |							 R |						       A |
       |			     |							 s |						       s |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 s |						       s |
       |			     |							 R |						       A |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |				 </div> 		 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Gr		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |							 G |							 |
       |			     |							 d |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 d |							 |
       |			     |							 G |							 |
       |			     |							   |							 |
       |			     |							 - |							 |
       |			     |							 G |							 |
       |			     |							 s |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 s |							 |
       |			     |							 G |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Br		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |							 B |							 |
       |			     |							 d |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 d |							 |
       |			     |							 B |							 |
       |			     |							   |							 |
       |			     |							 - |							 |
       |			     |							 B |							 |
       |			     |							 s |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							 s |							 |
       |			     |							 B |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |GL_MIN			     | <div>						   | <div>						 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Rr		   |					 Ar		 |
       |			     |					   =		   |					 =		 |
       |			     |							   |							 |
       |			     |					       min	   |					     min	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       R   |						     A	 |
       |			     |						       s   |						     s	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       R   |						     A	 |
       |			     |						       d   |						     d	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |				 </div> 		 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Gr		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |					       min	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       G   |							 |
       |			     |						       s   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       G   |							 |
       |			     |						       d   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Br		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |					       min	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       B   |							 |
       |			     |						       s   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       B   |							 |
       |			     |						       d   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+
       |GL_MAX			     | <div>						   | <div>						 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Rr		   |					 Ar		 |
       |			     |					   =		   |					 =		 |
       |			     |							   |							 |
       |			     |					       max	   |					     max	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       R   |						     A	 |
       |			     |						       s   |						     s	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       R   |						     A	 |
       |			     |						       d   |						     d	 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |				 </div> 		 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Gr		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |					       max	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       G   |							 |
       |			     |						       s   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       G   |							 |
       |			     |						       d   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       |			     |				   <div>		   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |					   Br		   |							 |
       |			     |					   =		   |							 |
       |			     |							   |							 |
       |			     |					       max	   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       B   |							 |
       |			     |						       s   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |						       B   |							 |
       |			     |						       d   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |							   |							 |
       |			     |				   </div>		   |							 |
       +-----------------------------+-----------------------------------------------------+-----------------------------------------------------+

       The results of these equations are clamped to the range 0 1.

       The GL_MIN and GL_MAX equations are useful for applications that analyze image data (image thresholding against a constant color, for
       example). The GL_FUNC_ADD equation is useful for antialiasing and transparency, among other things.

       Initially, both the RGB blend equation and the alpha blend equation are set to GL_FUNC_ADD.

NOTES

       The GL_MIN, and GL_MAX equations do not use the source or destination factors, only the source and destination colors.

ERRORS

       GL_INVALID_ENUM is generated if either modeRGB or modeAlpha is not one of GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MAX,
       or GL_MIN.

       GL_INVALID_VALUE is generated by glBlendEquationSeparatei if buf is greater than or equal to the value of GL_MAX_DRAW_BUFFERS.

ASSOCIATED GETS

       glGet() with an argument of GL_BLEND_EQUATION_RGB

       glGet() with an argument of GL_BLEND_EQUATION_ALPHA

SEE ALSO

       glGetString(), glBlendColor(), glBlendFunc(), glBlendFuncSeparate()

COPYRIGHT

       Copyright (C) 2006 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						  GLBLENDEQUATIONSEPAR(3G)
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