pvjc26/du3/program.c

#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>

#define SIZE 128
#define TEMPBUFFERSIZE 32

//kontrola, ze ci vycitane informacie su aritmeticky spravne
//VRACIA: int: -1 (CHYBA), 0 (False), 1 (True)
float IsArithCorrect(float num1, float num2, char op, float result)
{
    float calcResult = 0;
    
    if (op == '/' && num2 == 0) { return 0;}

    switch (op)
    {
        case '-':
        calcResult = num1 - num2;
        break;

        case '+':
        calcResult = num1 + num2;
        break;

        case '*':
        calcResult = num1 * num2;
        break;

        case '/':
        calcResult = num1 / num2;
        break;
    }

    calcResult = roundf(calcResult* 100.0f) / 100.0f;
    result = roundf(result * 100.0f) / 100.0f;

    if (calcResult == result)
    {
        return 1;
    }
    return 0;

}

int main()
{
    //pomocne premeny
    char line[SIZE], strBuffer[SIZE];
    line[0] = '\0';
    char* strtofEndPtr;
    int LinesOnInputCount = 0;

    while (fgets(line, SIZE, stdin) != NULL)
    {
        if (line[0] == '\n' || line[0] == '\0')
        {
            break;
        }
        strBuffer[0] = '\0';
        sscanf(line, "%127[^\n]", strBuffer);

        if (strBuffer[0] == '\0')
        {
            printf("CHYBA\n");
            continue;
        }
        
        bool isLineInvalid = false;
        //docasne 'char' premeny
        char num1Temp[TEMPBUFFERSIZE], num2Temp[TEMPBUFFERSIZE], resultTemp[TEMPBUFFERSIZE];
        num1Temp[0] = '\0';
        num2Temp[0] = '\0';
        resultTemp[0] = '\0';
        bool foundEqualSign = false;
        char op1 = 'N';  //N = 'None/NIC'

        for (int i = 0; strBuffer[i] != '\0'; i++)
        {
            bool isNegativeSign = false;
            if (isspace(strBuffer[i]) != 0)
            {
                continue;
            }
            if (strBuffer[i] == '-')
            {
                //kontrola - zistenie, ze ci znak '-' symbolizuje zapornu hodnotu (-456) alebo arit. operaciu minus
                //zistujeme to na zaklade toho, kde sme v riadku (ak sme na zaciatku num1, num2 alebo vyslednehoCisla, tak sa jedna o minusove znamienko)
                if (op1 == 'N' && strlen(num1Temp) == 0)
                {
                    isNegativeSign = true;
                }
                else if (op1 != 'N' && !foundEqualSign && strlen(num2Temp) == 0)
                {
                    isNegativeSign = true;
                }
                else if (foundEqualSign && strlen(resultTemp) == 0)
                {
                    isNegativeSign = true;
                }
            }
            if (isdigit(strBuffer[i]) != 0 || strBuffer[i] == '.' || isNegativeSign) 
            {
                //cislo sa bude zapisovat podla toho, kde sme pri citani riadku...
                //ak nenasiel ani arit. znamienko = cislo patri ku prvemu operandu (num1)
                //ak nasiel arit. znamienko ale NIE este symbol '=', tak cislo patri ku druhemu operandu (num2)
                //inak ak ma vsetko, tak zvysne nacitane cisla z riadku mozu byt vyluc. metodou len sucastou vysledku
                if (op1 == 'N')
                {
                    strncat(num1Temp, &strBuffer[i], 1);
                }
                else if (!foundEqualSign)
                {
                    strncat(num2Temp, &strBuffer[i], 1);
                }
                else
                {
                    strncat(resultTemp, &strBuffer[i], 1);
                }
            }
            else if (strBuffer[i] == '=')
            {
                foundEqualSign = true;
                continue;
            }

            else if (strBuffer[i] == '+' || strBuffer[i] == '-' || strBuffer[i] == '/' || strBuffer[i] == '*')
            {
                //predbezna kontrola, ak uz operator mame tak vyhod chybu pri druhom pokuse o nacitanie
                //taktiez, ak sa nasiel minusovy znak tu tak to moze byt len arit. znamienko
                if (op1 != 'N')
                {
                    isLineInvalid = true;
                }
                op1 = strBuffer[i];
            }
            else
            {
                isLineInvalid = true;
                break;
            }
                    
        }
            
            float num1 = strtof(num1Temp, &strtofEndPtr);
            float num2 = strtof(num2Temp, &strtofEndPtr);
            float resultNum = strtof(resultTemp, &strtofEndPtr);

            //** konecna faza = vypisovanie vysledkov

            //ak systematicka chyba
            if (isLineInvalid || op1 == 'N' || IsArithCorrect(num1, num2, op1, resultNum) == -1)
            {
                printf("CHYBA\n");
            }
            else if (IsArithCorrect(num1, num2, op1, resultNum) == 0)
            {
                printf("ZLE\n");
            }
            else
            {
                printf("OK\n");
            }
    }
    return 0;
}