/*-----------------------------------------------------------------------------------------
* Project Name   : Report04.1 - polynomial expression(Array)
* Programmed by  : Young Min Jo
* Student Number : 2008060021
* Date           : Sunday 6 April 2014
* (c) Copyright by Department of Computer Education at Chungbuk
*     National University, Chungbuk, Republic of Korea
------------------------------------------------------------------------------------------*/
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define MAX 100

/*-------------------------------------- calculate ----------------------------------------
/* Function : º¯¼ö xval¿¡µû¸¥ ´ÙÇ×½Ä °è»ê
------------------------------------------------------------------------------------------*/
float calculate(float *poly, int degree, float xval){

	float result = 0;

	for (int i = 0; i <= degree; i++){
		result += poly[i] * pow(xval, i);
	}
	return result;
}

/*--------------------------------------- addpoly -----------------------------------------
/* Function : º¯¼ö xval¿¡µû¸¥ ´ÙÇ×½Ä µÎ°³ÀÇ °è»ê ÇÕ
------------------------------------------------------------------------------------------*/
float addpoly(float *poly1, int degree1, float *poly2, int degree2, float x){

	float poly[MAX] = {} ;
	int result = 0;
	int degree;

	if (degree1 > degree2){
		degree = degree1;
	}
	else{
		degree = degree2;
	}

	for (int i = 0; i <= degree; i++){
		poly[i] = poly1[i] + poly2[i];
	}
	result = calculate(poly, degree, x);

	return result;
}

//Menu
void Menu(){
	printf("*****Polynomial Expression(Array)*****\n");
	printf("1. Poly1\n");
	printf("2. Poly2\n");
	printf("3. Poly1 + Poly2\n");
	printf("4. EXIT\n");
}

void main(){

	FILE *infp1, *infp2;	
	int i;
	int check;
	float x, result;

	float poly1[MAX] = {};
	int degree1;
	float poly2[MAX] = {};
	int degree2;

	//*.txt¿¡¼­ ÃÖ°íÂ÷¿Í °¢ Ç×ÀÇ °è¼ö¸¦ ¹ÞÀ½
	infp1 = fopen("poly1(array).txt", "r");
	if (infp1 == NULL){
		printf("ÆÄÀϾøÀ½");
		exit(0);
	}
	infp2 = fopen("poly2(array).txt", "r");
	if (infp2 == NULL){
		printf("ÆÄÀϾøÀ½");
		exit(0);
	}

	fscanf(infp1, "%d", &degree1);
	fscanf(infp2, "%d", &degree2);
	if (degree1 > MAX || degree2 > MAX){
		printf("Áö¼öÀÇ Å©±â°¡ ³Ê¹« Å®´Ï´Ù.\n");
		exit(0);
	}
	for (i = 0; i <= degree1; i++){
		fscanf(infp1, "%f", &poly1[i]);
	}	
	for (i = 0; i <= degree2; i++){
		fscanf(infp2, "%f", &poly2[i]);
	}
	fclose(infp1);
	fclose(infp2);

	while (1){
		Menu();
		printf("¸Þ´º ¹øÈ£ ÀÔ·Â : ");
		scanf("%d", &check);

		switch (check){

		case 1:
			printf("x °ª : ");
			scanf("%f", &x);
			result = calculate(poly1, degree1, x);
			printf("Poly1 : %0.1f\n", result);
			break;

		case 2:
			printf("x °ª : ");
			scanf("%f", &x);
			result = calculate(poly2, degree2, x);
			printf("Poly2 : %0.1f\n", result);
			break;

		case 3:
			printf("x °ª : ");
			scanf("%f", &x);
			result = addpoly(poly1, degree1, poly2, degree2, x);
			printf("Poly1 + Poly2 : %0.1f\n", result);
			break;

		case 4:
			exit(0);

		default:
			break;
		}
	}
}