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DCL:MISC１:FMTLIB: Conversion of Numeric Values to Character Strings *:Explanation of Subroutines

6.3.1 CHVAL

1.

Function

Converts a floating-point value into a character-string according to the character format specification. There is also an option for automatically generating a format specification that will restrict the length of the string to less than or equal to 8 characters (less than or equal to 3 significant digits). 

2.

Call

CALL CHVAL(CFMT,VAL,CVAL)

3.

Explanation of Parameters

CFMT	(C *( *))	The character format specification or the option interpreted by CHVAL. When the first 4 characters of CFMT begins with '(', it is recognized as a character format specification. In all other cases, the following 4 specifications can be chosen for the option.
		'A': automatically generate a format specification.
		'B': 'A' plus remove the decimal point and all trailing "0"s.
		'C': 'B' plus remove all zeros in front of the decimal point.
		'D': 'C', however, only when exponential form is used.
		For example, specify  'A', '(F6.1)' for CFMT.
VAL	(R)	The floating-point value to convert into character string.
CVAL	(C *( *))	Returns the characterized floating-point value. An argument longer than or equal to 8 characters.

4.

Notes

(a)

CFMT must be shorter than or equal to 16 characters.

(b)

An integer-type field descriptor can be specified as CFMT. In such a case, the part ofVAL more than 4 digits below the decimal point is rounded off in the character-string conversion.

(c)

CHVAL automatically left-justifies the characters. In other words, when the floating-point value 1.2 is characterized, CHVAL will return the same value, '1.2', for either '(F4.1)'or '(F8.1)'.

(d)

In some systems, a zero will not be placed to the left of the decimal point when handling a value smaller than 1 with a F-type field descriptor. In such a case, this routine will add a 0.

(e)

The character 'e' (lower case) is used to represent the exponent part.