33 lines
815 B
C
Executable File
33 lines
815 B
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)num.c 1.3 92/07/14 SMI" /* SVr4.0 1.1 */
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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/*
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true if string is numeric characters
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*/
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#include <ctype.h>
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num( string )
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register char *string;
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{
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if( !string || !*string )
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return 0; /* null pointer or null string */
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while( *string )
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if( !isdigit( *(string++) ) )
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return 0;
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return 1;
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}
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