/* book example "Building a Data File" */

#include<stdio.h>
int main()
{
	float x, y;
	FILE *graphptr;

	graphptr = fopen("graph.dat", "w");

	if (graphptr)
	{
		while(scanf("%f %f", &x, &y))
		{
			fprintf(graphptr, "%f %f", x, y);
		}
		fclose (graphptr);
	}
	else
		printf("File <graph.dat> is not available\n");
	
	return 0;
}