Thread: Ellipse problem

This is my program so far i don't get the right values =/

Code:

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <math.h>
//use #define for PI
#define PI 3.14159265359

//Function prototypes
void prob1(void);
void prob2(void);
void ellipse(double a, double b, double x0, double y0, double theta0);
int main(void)
{
        int menu;
        printf("\nThere are two parts.\n");
        printf("Enter the part number to execute (1, or 2): ");
        scanf("%d", &menu);
        // form a switch to execute one part
        switch(menu){
            case 1:
                prob1();
                break;
            case 2:
                prob2();
                break;
            default:
                printf("part %d does not exist.\n", menu);
        }
        exit(0);
}
void prob1(void)
{
//Declare a, b, x0, y0, and theta0 here
        double a=2.0, b=1.0, x0=2.0, y0=1.0, theta0=30.0;
//Call ellipse here
        ellipse( a, b, x0, y0, theta0);

        return;
}
void ellipse(double a, double b, double x0, double y0, double theta0)
{
//Add your statement

        int n, degree;
        double x, y, theta;

        printf("#-------------------------------\n");
        printf("#theta   x-coord      y-coord\n");
        printf("#-------------------------------\n");

        for (n=0; n<=36; n++){
        degree = n/.1;
        theta = degree*(180/PI);

        if(theta==0){
                x=x0+a*cos(theta);
                y=y0+b*sin(theta);
                printf("%4d %12.3e %12.3\n",degree, x, y);
        }else{
        x = x0 + a*cos(theta)*cos(theta0)-b*sin(theta)*sin(theta0);
        y = y0 + a*cos(theta)*sin(theta0)+b*sin(theta)*cos(theta0);
        printf(" %4d %12.3e %12.3e\n", degree, x, y);
        }}
        return;
}
void prob2(void)
{
//Add your statements
        FILE *infile;
        char text [75];
        int count =0;
        printf("\n");
        infile = fopen("in_ellipse.dat", "r");
        if (infile==NULL){
        printf("The input file does not exist.\n");
        exit(0);
        }else
        while(fgets(text,75,infile)!=NULL)
        {
        count++;
        printf("%s",text);
        }
        printf("\n There are %d lines.\n",count);
        fclose(infile);
         return;
}