﻿ C_program_sigle_egg_curve 2-3 (Suugaku-Dokusyuu-Juku's)
```

// Calculation Program for displaying a single egg curve 4 (Suugaku-Dokusyuu-Juku's), 07 (Wed.) Oct, 2009

// in the case that a=1, b=0.69, c=0.8

// file name: egg_shaped_curve_SUUDUKU_4.c

#include< stdio.h>

#include< math.h>

void main(void)

{

double x,y,a,b,c;

int i,imax,j,m;

double xmax,dx;

double xx[10001],yy[10001];// // Take care of the upper limit of storage memory capacitance.

FILE *fp;

// Setting of the constants

a=1;

b=0.69;

c=0.8;

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

// Setting of the other parameters

xmax=2*a;// the maximum value of x

dx=xmax/2000;// // the plotting interval of x

// execution of calculation

i=0;

for(x=0;x<=xmax+dx/10;x=x+dx)

{

i++;

xx[i]=x;

if(x>xmax)

{

y=0;

}

else

{

if(x>c)

{

y=b*sqrt(1-((x-c)/(c+2*(a-c)))*((x-c)/(c+2*(a-c))));

}

else

{

if(x< c)

{

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

}

else

{

y=b*sqrt(1-((x-c)/(c+2*(a-c)/2))*((x-c)/(c+2*(a-c)/2)));

}

}

}

yy[i]=y;

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

}

imax=i;

j=0;

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

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

{

j++;

m=imax-j;

xx[i]=xx[m];

yy[i]=-yy[m];

}

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\n",xx[i],yy[i]);

}

fflush(fp);

fclose(fp);

}

printf("end\n");

}// the end of the program

```

RETURN