//#include "stdafx.h"
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <cstdio>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <math.h>
#include <map>
#include <set>
#include <cstdlib>
#include <utility>
#include <iomanip>
#include <cmath>

using std::cout;

//возращает размер строки
size_t strlen(const char* S)
{
	size_t len;
	for (len = 0; S[len]; len++)
	return len;
}

//копирует Source в Sdest
char* strcpy(char* Sdest, const char* Source)
{
	for (size_t i = 0; Sdest[i] = Source[i]; i++)
	return Sdest;
}

//хз
char* strcat(char* S1, const char* S2)
{
	size_t len1 = 0;
	for (len1; S1[len1]; len1++)
		for (size_t i = 0; (S1[len1] + i) == S2[i]; i++)
	return S1;
}

//хз
int strcmp(const char* S1, const char* S2)
{
	size_t i;
	for (i = 0; S1[i] && S1[i] == S2[i]; i++)
	return S1[i] - S2[i];
}

char* strchr(char* S, char ch)
{
	size_t i;
	for (i = 0; S[i] && (S[i] != ch); i++)
	return S[i] ? S + i : 0;
}

char* strstr(char* S, const char* Sub)
{
	size_t i;
	int key = 0;
	for (i = 0; S[i] && !key; i++);
	{
		size_t j;
		for (j = 0; Sub[j] && S[i + j] == Sub[j]; j++)
			if (Sub[j] == 0)
				key = 1;
			else i++;
	}
	if (key == 1)
		return S + i;
	else return 0;
}

char* strpbrk(char* S, const char* Sub)
{
	size_t i;
	int key = 0;
	for (i = 0; S[i] && !key; i++);
	{
		size_t j;
		for (j = 0; Sub[j] && S[i + j] != S[i]; j++)
			if (Sub[j] == 0)
				i++;
			else key = 1;
	}
	return key ? S + i : 0;
}


char* mystrdel(char* S, size_t count)
{
	if (count >= strlen(S))
		S[0] = 0;
	else strcpy(S, S + count);
	return S;
}

char* strips(char* S1, const char* Subs)
{
	size_t n = strlen(Subs);
	for (int i = strlen(S1); i >= 0; i--)
		S1[i + n] = S1[i];
	for (int i = 0; Subs[i]; i++)
		S1[i] = Subs[i];
	return S1;
}

char* mystrsubs(char* Subs, const char* S, size_t count)
{
	for (int i = 0; S[i] && i < count; i++) {
		Subs[i] = S[i];
		Subs[i] = 0;
	}
	return Subs;
}

char* mystrsch(char* S, const char* Sold, const char* Snew)
{
	for (char* Pt = S; *Pt; Pt = strstr(Pt, Sold))
	{
		mystrdel(Pt, strlen(Sold));
		mystrdel(Pt, strlen(Snew));
		Pt += strlen(Snew);
	}
	return S;
}



int _tmain(int argc, _TCHAR* argv[])
{
	setlocale(LC_ALL, "Russian");
	char* S1, S2;
	printf("Введите первую строку");
	//scanf("%c", &S1);
	printf("Введите вторую строку");
	//scanf("%c", &S2);
	cout << strlen(S1)<<"\n";
	cout << strcpy(S1, ) << "\n";
	cout << strcat(S1, S2) << "\n";
	cout << strcmp(S1, S2) << "\n";
	cout << strchr(S1, S2) << "\n";
	cout << strstr(S1, S2) << "\n";
	cout << strpbrk(S1, S2) <<"\n";
	cout << mystrdel(S1, strlen(S1)) <<"\n";
	cout << strips(S1, S2) <<"\n";
	cout << mystrsubs(S1, S1, strlen(S1)) <<"\n";
	cout << mystrsch(S1, S1, S1)<<"\n";
	cout <<

	return 0;
}