#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <iostream>
int main() 
{
	setlocale(LC_ALL, "Russian");
	double x1;
	double x2;
	double dx;
	double a;
	double b;
	double c;
	printf("Enter a: ");
	scanf("%lf", &a);
	printf("Enter b: ");
	scanf("%lf", &b);
	printf("Enter c: ");
	scanf("%lf", &c);
	do 
	{
		printf("Enter x1: ");
		scanf("%lf", &x1);
		printf("Enter x2: ");
		scanf("%lf", &x2);
		printf("Enter dx: ");
		scanf("%lf", &dx);
	} while ((x2 <= x1) && (dx >= fabs(x2 - x1)));

		int const lines = 3;
		int l;
		double x = x1, f;

		while (x <= x2) 
		{

			printf("-----------------------------\n");
			printf("|      x      |      f      |\n");
			printf("-----------------------------\n");

			for (l = 1; ((x <= x2) && (l <= lines)); l++, x += dx) 
			{
			

				if ((x > 0) && (b == 0)) 
				{
					if (((x - a) != 0) || ((x - c) != 0))
					{
						f = ((x - a) / (x - c));
						printf("| %11.3lf | %11.3lf |\n", x, f);

					}	
					else
					{
						printf("| %11.3lf |    error    |\n", x);
					}
				
				}
				else 
					if ((x < 0) && (b != 0))
					{
						f = (x * x + b);
						printf("| %11.3lf | %11.3lf |\n", x, f);
						
					}
					else 
					
				if (c != 0)
				{
					f = (x / c);
					printf("| %11.3lf | %11.3lf |\n", x, f);
				}
				else
				{
					printf("| %11.3lf |    error    |\n", x);
				}
						
					
				
			}
				
			printf("-----------------------------\n");
			if (x <= x2)
			{
				printf("Press ENTER for continue: ");
				if (getchar() != '\n')
					break;
			}
		}

}