conv2.c

/*
 * program to show how strtol/strtod work
 * enter number when prompted
 *
 * Matt Bishop, ECS 36A
 *
 * April 30, 2024
 *	-- original version
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
 * macro
 */
#define BUFFERSIZE	1024	/* size of input buffer */

/*
 * main routine
 */
int main(void)
{
	char buf[BUFFERSIZE];	/* input buffer */
	long i;			/* integer read in */
	char *eol;		/* char following the end of integer */
	double f;		/* double read in */
	char *eod;		/* char following the end of double */

	/*
	 * read in a line and process it
	 */
	printf("How strtol/strtod work:\n> ");
	while(fgets(buf, BUFFERSIZE, stdin) != NULL){
		/* clobber the trailing newline to keep the output clean */
		if (buf[strlen(buf)-1] == '\n')
			buf[strlen(buf)-1] = '\0';
		/* convert to integer and print it */
		i = strtol(buf, &eol, 10);
		printf("\'%s\' is the integer %ld; rest of string: \'%s'\n",
								buf, i, eol);
		f = strtod(buf, &eod);
		printf("\'%s\' is the double  %f; rest of string: \'%s'\n",
								buf, f, eod);
		printf("> ");
	}
	/* clean up the end of the output */
	putchar('\n');


	/*
	 * done!
	 */
	return(0);
}

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

ECS 36A, Programming & Problem Solving Version of April 2, 2024 at 12:13PM

You can get the raw source code here.