#include <stdio.h>

void fac(int x){
	static FILE *fp;
	static flag=0;
	if(flag==0){
		fp=fopen("coordinate.txt","w+");
		flag=1;
	}else{
		fp=fopen("coordinate.txt","a+");
	}
	fprintf(fp,"%d\n",x);
	fclose(fp);
}

int main(){
	int i;
	for(i=10;i<20;i++)
		fac(i);
	return 0;
}

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