﻿ C_program_for_five_egg_curves 2-2 (Suugaku-Dokusyuu-Juku's)

// Calculation Program for displaying five egg curves 3 (Suugaku-Dokusyuu-Juku's), 18(Fri.) Sep., 2009

// An ellipsoid in the case of a = c , and a circle in the case of b = 0 .

// file name: egg_shaped_curve_3b.c

// recommended values: a = 1.35, b = 1.15, c = 0.5

#include< stdio.h>

#include< math.h>

void main(void)

{

double x,y,r,a,b,c,db,bmin,bmax,pai;

double t,dt;

int i,imax,n,nmax;

double xx[10][2001],yy[10][2001];// Take care of the upper limit of storage memory capacitance.

FILE *fp;

// Setting of the constants

pai=3.1415927;

a=1.35;

b=1.15;

c=0.5;

bmin=b-0.2;

bmax=b+0.2;

db=(bmax-bmin)/5;

printf("a=%f\n\n",a);

// Setting of the other parameter

dt=pai/500;// the plotting interval of the phase angle

// execution of calculation

i=0;

for(t=0;t<=2*pai+0.001;t=t+dt)

{

i++;

n=0;

for(b=bmin;b<=bmax+0.001;b=b+db)

{

n++;

r=(a+c+(c-a)*cos(t))/2;

x=b*cos(t)/2+r*cos(t);

y=r*sin(t);

yy[n][i]=y;

xx[n][i]=x;

printf("i=%d,x=%f,y=%f\n",i,x,y);

}

}

imax=i;

nmax=n;

// writing the calculated coordinates data of the curve into a textfile

fp=fopen("egg-shaped curve.txt","w");

if(fp==NULL)

{

printf("FILE OPEN ERROR\n");

}

else

{

for(i=1;i<=imax;i++)

{

fprintf(fp,"%f,%f,%n,%f,%f,%n,%f,%f,%n,%f,%f,%n,%f,%f\n",xx[1][i],yy[1][i],"",xx[2][i],yy[2][i],"",xx[3][i],yy[3][i],"",xx[4][i],yy[4][i],"",xx[5][i],yy[5][i]);

}

fflush(fp);

fclose(fp);

}

printf("end\n");

}// the end of the program

RETURN