system_zad7/Project2/Source.c

#define _CRT_SECURE_NO_WARNINGS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int is_valid_double(const char* str) {
    char* endptr;
    strtod(str, &endptr);
    return *endptr == '\0' && endptr != str;
}

void write_results(const char* filename, double x1, double x2, double D, int root_count) {
    HANDLE hFile = CreateFile(filename, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        MessageBox(NULL, "Îøèáêà îòêðûòèÿ ôàéëà äëÿ çàïèñè ðåçóëüòàòîâ.", "Îøèáêà", MB_OK | MB_ICONERROR);
        return;
    }

    char buffer[256];
    if (root_count == 2) {
        sprintf(buffer, "Êîðíè óðàâíåíèÿ: %.2f è %.2f\n", x1, x2);
    }
    else if (root_count == 1) {
        sprintf(buffer, "Êîðåíü óðàâíåíèÿ: %.2f\n", x1);
    }
    else {
        sprintf(buffer, "Íåò äåéñòâèòåëüíûõ êîðíåé.\n");
    }

    sprintf(buffer + strlen(buffer), "Äèñêðèìèíàíò: %.2f\n", D);
    DWORD written;
    WriteFile(hFile, buffer, strlen(buffer), &written, NULL);
    CloseHandle(hFile);
}

int main() {
    double a, b, c;
    char line[256];
    int count = 0;

    // Ñ÷èòûâàåì êîýôôèöèåíòû èç ôàéëà
    HANDLE hFile = CreateFile("test.txt", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        MessageBox(NULL, "Îøèáêà îòêðûòèÿ ôàéëà äëÿ ÷òåíèÿ êîýôôèöèåíòîâ.", "Îøèáêà", MB_OK | MB_ICONERROR);
        return 1;
    }

    DWORD bytesRead;
    while (ReadFile(hFile, line, sizeof(line) - 1, &bytesRead, NULL) && bytesRead > 0) {
        line[bytesRead] = '\0';
        char* token = strtok(line, " \n");
        while (token != NULL) {
            if (is_valid_double(token)) {
                if (count == 0) {
                    a = strtod(token, NULL);
                }
                else if (count == 1) {
                    b = strtod(token, NULL);
                }
                else if (count == 2) {
                    c = strtod(token, NULL);
                }
                count++;
            }
            else {
                MessageBox(NULL, "Îøèáêà: Ââåäåíû íåêîððåêòíûå äàííûå.", "Îøèáêà", MB_OK | MB_ICONERROR);
                CloseHandle(hFile);
                return 1;
            }
            token = strtok(NULL, " \n");
        }
    }
    CloseHandle(hFile);

    // Ïðîâåðÿåì êîýôôèöèåíòû
    if (count < 3) {
        MessageBox(NULL, "Îøèáêà: Íå äîñòàòî÷íî êîýôôèöèåíòîâ.", "Îøèáêà", MB_OK | MB_ICONERROR);
        return 1;
    }

    if (a == 0) {
        MessageBox(NULL, "Îøèáêà: Êîýôôèöèåíò 'a' íå ìîæåò áûòü ðàâåí 0.", "Îøèáêà", MB_OK | MB_ICONERROR);
        return 1;
    }

    // Âû÷èñëÿåì äèñêðèìèíàíò
    double D = b * b - 4 * a * c;
    double x1, x2;
    int root_count = 0;

    if (D > 0) {
        x1 = (-b + sqrt(D)) / (2 * a);
        x2 = (-b - sqrt(D)) / (2 * a);
        root_count = 2;
    }
    else if (D == 0) {
        x1 = -b / (2 * a);
        root_count = 1;
    }

    // Çàïèñûâàåì ðåçóëüòàòû â ôàéë
    write_results("otvet.txt", x1, x2, D, root_count);

    MessageBox(NULL, "Ðåçóëüòàòû çàïèñàíû â ôàéë 'otvet.txt'.", "Ãîòîâî", MB_OK | MB_ICONINFORMATION);
    return 0;
}