circles.c

#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "ncsa.h"
#include "query.h"

enum ERROR_TYPE {NO_ERROR, DIVISION_BY_ZERO_OR_PARTIAL_FRACTION};

enum ERROR_TYPE error_type = NO_ERROR;

void	errorMessage(enum ERROR_TYPE);
void	findAreaAndCircumference(double);
char *fractionAndDecimal(double, char *);

char buffer[80];
#if !defined(PI)
#define PI M_PI
#if !defined(M_PI)
#undefine PI
#define PI 3.14159265
#endif
#endif

int	main(int argc, char **argv) {
	char  query_string[2048];
	char  length_str[255];
	char  length_num_str[255];
	char  length_den_str[255];
	char  dimension_str[9];
	
	double length = 0;
	double circumference;
	double area;
	double radius;
	double diameter;

	int	num_exists = 0;
	int	den_exists = 0;

	setvbuf( stdout, NULL, _IONBF, 0); /* stdout buffering off */
	strcpy(query_string, getenv("QUERY_STRING"));
	get_var(dimension_str, "dimension", query_string);
	get_var(length_str, "length", query_string);
	num_exists = get_var(length_num_str, "length_num", query_string);
	den_exists = get_var(length_den_str, "length_den", query_string);
	num_exists = (num_exists != EOF) ? num_exists : 0;
	den_exists = (den_exists != EOF) ? den_exists : 0;
	if (!num_exists&&!den_exists) {
		length = atof(length_str);
	} else {
		if ((den_exists&&num_exists)&&atof(length_den_str))
			length = atof(length_str)+atof(length_num_str)/atof(length_den_str);
		else
			error_type = DIVISION_BY_ZERO_OR_PARTIAL_FRACTION;
	}
	if (dimension_str[0]=='r') {
		radius = length;
		diameter = 2*radius;
	} else {
		diameter = length;
		radius = diameter/2;
	}
	if (num_exists||den_exists) {
		printf("<p>Original input was: %s %s/%s is the %s of the circle.<br>\n",
				length_str, length_num_str, length_den_str, dimension_str);
	} else {
		printf(	"<p>Original input was: %s is the %s of the circle.<br>\n",
				length_str, dimension_str);
	}
	printf(	"<hr width=\"80%\">\n");
	printf(	"<p>\n");
	if (!error_type) 
		findAreaAndCircumference(radius);
	else
		errorMessage(error_type);
printf(
"<center>"
"<img alt=\"[circles]\"  src=\"../images/circles2.gif\">"
"<p>Enter a length and select whether it is the radius<br>"
"or the diameter, and then click on submit.<br>"
"<form action=\"circles.pl\" >"
"<table class=\"hidden\">"
"<td class=\"hidden\"><input type=\"text\"  name=\"length\"     size=5 >&nbsp;&nbsp;"
"<input type=\"text\"  name=\"length_num\" size=1 >/"
"<input type=\"text\"  name=\"length_den\" size=1 ></td>"
"<td class=\"hidden\"><table class=\"hidden\">"
"	<h6><td class=\"hidden\"><input type=\"radio\" name=\"dimension\"  value=\"radius\"   checked >radius</td><tr>"
"	<td class=\"hidden\"><input type=\"radio\" name=\"dimension\"  value=\"diameter\" >diameter</td></h6>"
"</table>"
"</td><tr></table>"
"<input type=\"submit\"                  value=\"submit\" >"
"<input type=\"reset\">"
"</form>"
"</center>"
);
	return 0;
} /* main */

void	errorMessage(enum ERROR_TYPE error_no) {
	switch (error_no) {
		case DIVISION_BY_ZERO_OR_PARTIAL_FRACTION:
			printf("<h2>\n");
			printf("<br>\n");
			printf("If any part of the fraction is filled in, you must specify numerator and<br>\n");
			printf("denominator.  The denominator may not be 0.<br>\n");
			printf("</h2>\n");
			break;
	};
} /* errorMessage */

void	findAreaAndCircumference(double r) {
	double circumference;
	double area;

	circumference = 2*PI*r;
	area = PI*r*r;

	printf("Circles radius is "); fractionAndDecimal(r, buffer);
	printf(", ");
	printf("diameter is "); fractionAndDecimal(2*r, buffer);
	printf("<br>\n");
	printf("Area inside the circle is about "); 
	fractionAndDecimal(area, buffer);
	printf(" square units.<br>\n");
	printf("Circumference around the circle is about "); 
	fractionAndDecimal(circumference, buffer);
	printf(" units.<br>\n");
} /* findAreaAndCircumference */

char *fractionAndDecimal(double x, char *buffer) {
	double whole;
	double fractional;

	char *fractional_str[16] = {	" ", " 1/16", " 1/8", " 3/16", 
							" 1/4", " 5/16", " 3/8", " 7/16", 
							" 1/2", " 9/16", " 5/8", " 11/16", 
							" 3/4", " 13/16", " 7/8", " 15/16"};
	
	fractional = modf(x, &whole);
	printf(" %.0f%s (%.3f) ", whole, fractional_str[(int)(fractional*16)], x);

	return buffer;
} /* fractionAndDecimal */
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Wednesday, 9 July 2025 Michael J. Chappell Contact me at: mcsuper5@freeshell.org
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