system_zad5/Project5/includes.h

#pragma once
#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "Header.h"
#include <ctype.h>
#include <math.h>
double plus(double a, double b) {
	return a + b;
}
double minus(double a, double b) {
	return a - b;
}
double umnosh(double a, double b) {
	return a * b;
}
double del(double a, double b) {
	return a / b;
}
void concat(char* first, char* second) {

	char third[512];
	snprintf(third, sizeof third, "%s%s", first, second);
	printf(third);
}

void inttostr(double num, char* str) {
	int i = 0;
	int otric = 0;
	if (num < 0) {
		otric = 1;
		num = -num;
	}
	long long intPart = (long long)num;
	double fpart = num - intPart;
	if (intPart == 0) {
		str[i++] = '0';
	}
	else {
		while (intPart > 0) {
			str[i++] = (intPart % 10)+'0';
			intPart /= 10;
		}
	}
	if (otric) {
		str[i++] = '-';
	}

	for (int j = 0; j < i / 2; j++) {
		char temp = str[j];
		str[j] = str[i - j - 1];
		str[i - j - 1] = temp;
	}
	str[i++] = '.';
	for (int j = 0; j < 6; j++) {
		fpart *= 10;
		int digit = (int)fpart;
		str[i++] = digit + '0';
		fpart -= digit;

	}
		str[i] = '\0';
}

double strtoInt(char* str) {
	double result = 0.0;
	int sign = 1;
	double dp = 1.0;
	int i = 0;
	while (isspace(str[i])) {
		i++;
	}
	if (str[i] == '-') {
		sign = -1;
		i++;
	}
	else if (str[i] == '+') {
		i++;
	}



	while (isdigit(str[i])) {
		result = result * 10.0 + (str[i] - '0');
		i++;
	}
	if (str[i] == '.') {
		i++;
		while (isdigit(str[i])) {
			dp *= 10.0;
			result += (str[i] - '0') / dp;
			i++;
		}
	}
	return sign * result;
}