
Natural for UNIX	Version 8.3.7 for UNIX	SEARCH CONTENTS \| PDF BOOKS \| HOME UP PREV NEXT

— Statements —

SUBTRACT

This document covers the following topics:

Function
Syntax 1 - SUBTRACT Statement without GIVING Clause
Syntax 2 - SUBTRACT Statement with GIVING Clause
Example

Belongs to Function Group: Arithmetic and Data Movement Operations

Function

The SUBTRACT statement is used to subtract the values of two or more operands.

Syntax 1 - SUBTRACT Statement without GIVING Clause

SUBTRACT [ROUNDED]

(arithmetic-expression)
operand1

FROM operand2

Operand Definition Table:

Operand	Possible Structure					Possible Formats												Referencing Permitted	Dynamic Definition
`operand1`	C	S	A		N		N	P	I	F		D	T					yes	no
`operand2`		S	A		M		N	P	I	F		D	T					yes	no

Syntax Element Description:

Syntax Element Description

arithmetic-expression See Arithmetic Expression in the COMPUTE statement.

operand1
FROM operand2

Operands:

operand2 is the minuend, operand1 is the subtrahend, hence the statement is equivalent to:

operand2 := operand2 - operand1

As for the formats of the operands, see also Rules for Arithmetic Assignments, Performance Considerations for Mixed Formats in the Programming Guide.

ROUNDED

ROUNDED Option:

If you specify the keyword ROUNDED, the result will be rounded.

For information on rounding, see Rules for Arithmetic Assignment, Field Truncation and Field Rounding in the Programming Guide.

Syntax 2 - SUBTRACT Statement with GIVING Clause

SUBTRACT [ROUNDED]

(arithmetic-expression)
operand1

FROM

(arithmetic-expression)
operand2

GIVING operand3

Operand Definition Table:

Operand	Possible Structure				Possible Formats									Referencing Permitted	Dynamic Definition
`operand1`	C	S	A	N			N	P	I	F		D	T	yes	no
`operand2`	C	S	A	N			N	P	I	F		D	T	yes	no
`operand3`		S	A	M	A	U	N	P	I	F	B*	D	T	yes	yes

* Format B of operand3 may be used only with a length of less than or equal to 4.

Syntax Element Description:

Syntax Element	Description
`arithmetic-expression`	See Arithmetic Expression in the `COMPUTE` statement.
`GIVING`	GIVING Clause: When the `GIVING` clause is used, `operand2` will not be modified, and the result will be stored in `operand3`.
`operand1` `FROM operand2` `GIVING operand3`	Operands: `operand2` is the minuend, `operand1` is the subtrahend, `operand3` is the result field, hence the statement is equivalent to: `operand3 := operand2 - operand1` As for the formats of the operands, see also the section Performance Considerations for Mixed Formats in the Programming Guide.
`ROUNDED`	ROUNDED Option: If you specify the keyword `ROUNDED`, the result will be rounded. For information on rounding, see Rules for Arithmetic Assignment, Field Truncation and Field Rounding in the Programming Guide.

Example

** Example 'SUBEX1': SUBTRACT                                           
************************************************************************
DEFINE DATA LOCAL                                                       
1 #A (P2) INIT <50>                                                     
1 #B (P2)                                                               
1 #C (P1.1) INIT <2.4>                                                  
END-DEFINE                                                              
*                                                                       
SUBTRACT 6 FROM #A                                                   
WRITE NOTITLE 'SUBTRACT 6 FROM #A              '  10X '=' #A            
*                                                                       
SUBTRACT 6 FROM 11 GIVING #A                                         
WRITE         'SUBTRACT 6 FROM 11 GIVING #A    '  10X '=' #A            
*                                                                       
SUBTRACT 3 4 FROM #A GIVING #B                                        
WRITE         'SUBTRACT 3 4 FROM #A GIVING #B  '  10X '=' #A '=' #B     
*                                                                       
SUBTRACT -3 -4 FROM #A GIVING #B                                      
WRITE         'SUBTRACT -3 -4 FROM #A GIVING #B'  10X '=' #A '=' #B     
*                                                           
SUBTRACT ROUNDED 2.06 FROM #C                             
WRITE         'SUBTRACT ROUNDED 2.06 FROM #C   '  10X '=' #C
*                                                           
END

Output of Program SUBEX1:

SUBTRACT 6 FROM #A                        #A:  44        
SUBTRACT 6 FROM 11 GIVING #A              #A:   5        
SUBTRACT 3 4 FROM #A GIVING #B            #A:   5 #B:  -2
SUBTRACT -3 -4 FROM #A GIVING #B          #A:   5 #B:  12
SUBTRACT ROUNDED 2.06 FROM #C             #C:  0.3

SEARCH CONTENTS | PDF BOOKS | HOME UP PREV NEXT