// Calculation Program for displaying four egg curves. (egg shaped curve V), 05 (Thurs.) Nov., 2009
// file name: egg5a2.c
#include< stdio.h>
#include< math.h>
void main(void)
{
double x,y,a,b,c,db,bmax,bmin,pai;
double t,dt;
int i,imax,n,nmax;
double xx[10001],yy[10][10001];// Take care of the upper limit of storage memory capacitance.
FILE *fp;
// Setting of the constants
pai=3.1415927;
a=1;
bmax=0.9;
bmin=0.3;
c=0.1;
db=0.2;
printf("a=%f\n\n",a);
// Setting of the other parameter
dt=pai/1000;// plotting interval of the phase angle
// execution of calculation
i=0;
for(t=-2*pai;t<=2*pai;t=t+dt)
{
i++;
n=0;
for(b=bmin;b<=bmax+db/100;b=b+db)
{
n++;
x=a*cos(t);
y=(b+c*cos(t))*sin(t);
yy[n][i]=y;
xx[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,%f,%f,%f\n",xx[i],yy[1][i],yy[2][i],yy[3][i],yy[4][i]);
}
fflush(fp);
fclose(fp);
}
printf("end\n");
}// the end of the program
RETURN