Headers/HeadersFile/Header.h

#pragma once
#include <stdio.h>
#include <malloc.h>
#include <math.h>
#define SIZE 100
#define LEN_ONE strlen(str1)
#define LEN_TWO strlen(str2)
#define SUMM a+b
#define DIFF a-b
#define POW a*b
#define DEL a/b
#define LANGUAGE "chcp 1251 > nul"
#define LINESIGMENT(a)(a*a)
double Summa(double, double);
double Difference(double, double);
double Pow(double, double);
double Del(double, double);
char* Unification(char* str1, char* str2);
void Transformation();
double p = 0;
double s = 0;
int Line(int x1, int x2, int y1, int y2, int x3, int y3) {
    if (x1 == x2 || y1 == y2 || x1 == x3 || x2 == x3 || y1 == y3 || y2 == y3) {
        printf("Êîîðäèíàòû âòîðîé òî÷êè äîëæíû áûòü áîëüøå èëè ìåíüøå ïåðâîé");
        return 1;
    }
    double d1;
    double d2;
    double d3;
    double pp;
    int x = (x2 - x1);
    int y = (y2 - y1);
    int z = (x3 - x2);
    int c = (y3 - y2);
    int g = (x1 - x3);
    int h = (y1 - y3);
    d1 = sqrt(LINESIGMENT(x) + LINESIGMENT(y));
    /*printf("%.2lf\n", d1);*/
    d2 = sqrt(LINESIGMENT(z) + LINESIGMENT(c));
    /*printf("%.2lf\n", d2);*/
    d3 = sqrt(LINESIGMENT(g) + LINESIGMENT(h));
    /*printf("%.2lf\n", d3);*/

    if (d1 < (d2 + d3) && d2 < (d1 + d3) && d3 < (d2 + d1)) {
        p = d1 + d2 + d3;
        pp = p / 2;
        s = sqrt(pp * (pp - d1) * (pp - d2) * (pp - d3));
        return 0;
    }
    else {
        return -1;
    }
}

void Triangle() {
    if (Line(2, 4, 1, 2, 3, 3) == -1) {
        printf("Òðåóãîëüíèêà íå ñóùåñòâóåò");
    }
    else {
        printf("%.2lf\n", p);
        printf("%.2lf\n", s);
    }
    
}

char* Unification(char* str1, char* str2) {
    char* result = malloc(LEN_ONE + LEN_TWO + 1);
    sprintf(result, "%s %s", str1, str2);
    return result;
}

double Summa(double a, double b) {
    return SUMM;
}

double Difference(double a, double b) {
    return DIFF;
}

double Pow(double a, double b) {
    return POW;
}

double Del(double a, double b) {
    return DEL;
}
void Transformation() {
    printf("Âûáåðèòå æåëàåìîå äåéñòâèå:\n1 - Êîíâåðòèðîâàòü ñòðîêó â ÷èñëî\n2 - Êîíâåðòèðîâàòü ÷èñëî â ñòðîêó\n");
    int number;
    scanf("%d", &number);
    if (number == 1) {
    printf("Ââåäèòå ñòðîêó: ");
    char* str = malloc(sizeof(char));
    scanf("%s", str);
    double arr;
    sscanf(str, "%lf", &arr);
    printf("×èñëî: %.2lf", arr);
    return 0;
    }
    else if (number == 2) {
        printf("Ââåäèòå ÷èñëî: ");
        double array;
        scanf("%lf", &array);
        char* str = malloc(sizeof(char));
        sprintf(str, "%.2lf", array);
        printf("%s", str);
        return 0;
    }
    else {
        printf("Òàêîé çàäà÷è íå ñóùåñòâóåò!");
        return 1;
    }
    printf("\n");
}