If you're having problems, it's often handy to include your own debug lines:

Code:

#include <stdio.h>
#include <math.h> /* contains sin function */
#define PI 3.14 /* used in conversion of degrees to radians */
#define SCALE 35
void main(void)
{
int counter, index, lines;
double degree, radians, scale_sine;
printf("Type in the initial step size in degrees:\n");
scanf("%lf", °ree);
/**
*** I will assume an err on your part here and assume you
*** have this line correct in your actual code, right? If not,
*** here is your problem.
**/
printf("Type in the number of lines to be printed:\n");
scanf("%d", &lines);
radians = degree * PI/180; /* convert degrees to radians */
scale_sine = SCALE * sin(radians);
/**
*** Debug lines.
**/
printf("DEBUG: %f radians. %f scale_sine. %f degree.\n",
radians, scale_sine, degree );
/**
*** See how simple that is, and how benificial it can be?
**/
for(counter = 0; counter < lines; ++counter)
{
/**
*** Debug Lines.
**/
printf("DEBUG: %d counter < %d lines\n",
counter, lines );
for(index = -SCALE; index < scale_sine; ++index)
{
printf(" ");
}
printf("*\n");
}
}

This way you can be sure your numbers are correct.

You could even make a macro to do it for you.

Quzah.