System1/Project1/Source.c

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include<math.h>
#include<malloc.h>


void output(char str[50])
{
	printf(str);
}
double quadratic_equation(int a, int b, int c)
{
	char result[50];
	double D = pow(b, 2) - 4 * a * c;
	if (a == 0)
	{
		double x1 = -c / b;
		sprintf(result, "%f\n", x1);
		output(result);
		}
	else if(D > 0)
	{
		if (D > 0)
		{
			double x1 = (-b + sqrt(D)) / (2 * a);
			double x2 = (-b - sqrt(D)) / (2 * a);
			sprintf(result, "%f,%f\n", x1, x2);
			output(result);
		}
		else if (D == 0)
		{
			double x1 = (-b) / (2 * a);
			sprintf(result, "%f\n", x1);
			output(result);
		}
		else
		{
			strcpy(result, "Êîðíåé íåò\n");
			output(result);
		}
	}
	else
	{
		strcpy(result, "Ëîæíûå äàííûå\n");
		output(result);
	}
	
}

double system_equations(int a1, int b1, int c1, int a2, int b2, int c2)
{
	char result[50];
	double D = a1 * b2 - a2 * b1;
	if (D == 0)
	{
		strcpy(result, "Ëîæíûå äàííûå\n");
		output(result);
	}
	else
	{
		double x1 = (c1 * b2 - c2 * b1) / D;
		double x2 = (a1 * c2 - a2 * c1) / D;
		printf("%f, %f\n", x1, x2);
		output(result);
	}
	
}
double factorial(int a)
{
	char result[50];
	if (a < 0 || (a*10)%10 != 0)
	{
		strcpy(result, "Ëîæíûå äàííûå\n");
		output(result);
	}
	else if (a == 0)
	{
		int F = 1;
		sprintf(result, "%d\n", F);
		output(result);
	}
	else
	{
		int F = 1;
		for (size_t i = 1; i <= a; i++)
		{
			F = F * i;
		}
		sprintf(result, "%d\n", F);
		output(result);
	}
}
void input(int n)
{
	int result;
	if (n == 1)
	{
		int a, b, c;
		printf("Ââåäèòå a, b, c\n");
		scanf("%d%d%d", &a, &b, &c);
		quadratic_equation(a, b, c);

	}
	if (n == 2)
	{
		int a1, b1, c1, a2, b2, c2;
		printf("Ââåäèòå a1, b1, c1, a2, b2, c2\n");
		scanf("%d%d%d%d%d%d", &a1, &b1, &c1, &a2, &b2, &c2);
		system_equations(a1, b1, c1, a2, b2, c2);

	}
	if (n == 3)
	{
		int a;
		printf("Ââåäèòå a\n");
		scanf("%d", &a);
		factorial(a);
	}
	else
	{
		printf("Òàêîãî çàäàíèÿ íåò/íåâåðíî\n");
	}
}
int main() 
{
	system("chcp 1251>nul");
	while (1)
	{
		int n;
		printf("Âûáåðèòå çàäà÷êó äëÿ ðåøåíèÿ:\n1. Êâàäðàòíîå óðàâíåíèå\n2. Ñèñòåìà óðàâíåíèé\n3. Ôàêòîðèàë\n0. Âûõîä\n");
		scanf("%d", &n);
		input(n);
	}
	
}