[Courses] Reminder, and questions (and semi spoiler on ex 6-1)

[Michelle Murrain]

Sorry, I've been remiss in my "coordination"! The next set of chapters, 4,5 
and 6 were theoretically due last Friday! I've just now finished chapter 6.

How is it going? How is everyone doing? Post your progress to the list, so 
people know what's up.

  I have two questions for the gurus:

1) Why is forgetting the "\n" at the end of a printf statement suppress the 
line altogether? ( in perl, it will simply print the line w/o a newline).


2) In trying to do exercise 1, I wanted to use the sqrt function. I looked 
at the (short) man page for it. This is the code I have:

#include <stdio.h>
#include <math.h>

/* program to find the distance between two points */

int x1;
int x2;
int y1;
int y2;
char line[20];
int distance_squared;
double distance;
double sqrt(double distance);

int main()
{
   printf("Point 1(x,y):");
   fgets(line, sizeof(line), stdin);
   sscanf(line, "%d,%d",&x1,&y1);

   printf("Point 2(x,y):");
   fgets(line, sizeof(line), stdin);
   sscanf(line, "%d,%d",&x2,&y2);

   printf("Here are the points:%d,%d and %d,%d\n",x1,y1,x2,y2);

   distance_squared = ((x2-x1)^2) + ((y2-y1)^2);

   distance = sqrt(distance_squared);

   printf("Square of distance between two points: %d Actual distance: 
%f\n",distance_squared,distance);

   return(0);
}

On compiling, it barfs with this error:
/home/mpm/tmp/ccU4dc3d.o: In function `main':
/home/mpm/code/cprograms/ex6-1.c:26: undefined reference to `sqrt'
collect2: ld returned 1 exit status

So what am I doing wrong?

Thanks.

.Michelle

---------------------------------------
Michelle Murrain
tech at murrain.net
AIM/Yahoo Messenger:pearlbear0
http://www.murrain.net/ for pgp public key