#include <stdio.h>
/* file: ExternalFunc1.c */
double ExternalFunc1_ext(char *fileName,double z)
{
double res;
//res = x+2.0*x*x;
//res=tm;	
FILE *fp;
fp=fopen(fileName,"a+");
fprintf(fp,"%lf\n",z);
//rewind(fp);
fclose(fp);
res=z;
return res;

}