tmp-name.c

linux下的Ｃ语言开发

/*-*/
/********************************************************
 * Question:						*
 *	Why does the following program print		*
 *	Name1: @$@#$#@$@				*
 *	(Your results may vary)?			*
 ********************************************************/
/*+*/
#include <stdio.h>
#include <string.h>

/********************************************************
 * tmp_name -- return a temporary file name		*
 *							*
 * Each time this function is called, a new name will	*
 * be returned.						*
 *							*
 * Returns						*
 * 	Pointer to the new file name.			*
 ********************************************************/
char *tmp_name(void)
{
    char name[30];	/* The name we are generating */
    static int sequence = 0;	/* Sequence number for last digit */

    ++sequence;	/* Move to the next file name */

    strcpy(name, "tmp");

    /* But in the squence digit */
    name[3] = sequence + '0';

    /* End the string */
    name[4] = '\0';

    return(name);
}

int main()
{
    char *tmp_name(void);	/* get name of temporary file */

    printf("Name: %s\n", tmp_name());
    return(0);
}