gistfile1.c

#include <stdio.h>

float func(float x)
{
  return x * 2 + 10;
}

void main(void)
{
	FILE* file = fopen("table.txt", "w");
	float x;

	for(x = -1.34; x < 5.43; x += 0.0001)
	{
		fprintf(file, "%5.5f %5.5f\n", x, func(x));
	}

	fclose(file);

	return 0;
}