﻿ C_program_for_five_egg_curves 2-1 (Suugaku-Dokusyuu-Juku's)
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// Calculation Program for displaying five egg curves 3 (Suugaku-Dokusyuu-Juku's), 17(Thurs.) Sep., 2009

// file name: egg_shaped_curve_SUUDUKU_2b.c

// recommended values: a=1.5, b=1.2, c=8;

#include< stdio.h>

#include< math.h>

void main(void)

{

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

int i,imax,n,nmax,j,m;

double xmax,dx;

double xx[2005],yy[10][1005];// Take care of the upper limit of storage memory capacitance.

FILE *fp;

// Setting of the constants

a=1.5;b=1.2;c=8;

// Setting of the other parameters

xmax=a;// the maximum value of x

dx=xmax/250;// the plotting interval of x

db=b/12;

bmax=b+2*db+0.00001;

bmin=b-2*db;

// execution of calculation

i=0;

for(x=-xmax;x<=xmax+dx/10;x=x+dx)

{

i++;

n=0;

xx[i]=x;

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

{

n++;

if(x>xmax)

{

y=0;

}

else

{

y=(1+(x+a)/c)*sqrt(1-(x/a)*(x/a))/b;

}

yy[n][i]=y;

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

}

}

imax=i;

nmax=n;

j=0;

for(i=imax+1;i<=2*imax;i++)

{

j++;

m=imax-j;

xx[i]=xx[m];

for(n=1;n<=nmax;++n)

{

yy[n][i]=-yy[n][m];

}

}

// 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<2*imax;i++)

{

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

}

fflush(fp);

fclose(fp);

}

printf("end\n");

}// the end of the program

```

RETURN