#include <stdio.h>
#include <string.h>
#include <Windows.h>
#include <iostream>
#include <ctime>
#define SP system("pause");
#define CLS system("cls");
using namespace std;

/*char* getback(const char* word1, char* word2) {
	char* save = word2;
	while (*word2 >= '\0') *word2++ = *word1++;
	return save;
}*/

char* strdel1(char* word, int p, int k) {
	int word_str = strlen(word);
	if (p >= word_str || p + k >= word_str) {
		return 0;
	}
	for (int i = p + k; i <= word_str; ++i) {
		word[i - k] = word[i];
	}
	return word;
}

char* strdel2(char* word, int p, int k) {
	int word_str = strlen(word), i = p + k;
	if (p >= word_str || i >= word_str) {
		return 0;
	}
	while (i <= word_str) {
		word[i - k] = word[i];
		i++;
	}
	return word;
}

char* strdel3(char* word, int p, int k) {
	int word_str = strlen(word), i = p + k;
	if (p >= word_str || i >= word_str) {
		return 0;
	}
	do {
		word[i - k] = word[i];
		i++;
	} while (i <= word_str);
	return word;
}

char* strdel4(char* word, int p, int k) {
	char* start = word + p, *end = word + p + k; //берем отрезок от p до k
	int word_str = strlen(word), i = p + k;
	if (p >= word_str || i >= word_str) {
		return 0;
	}
	while (*end != '\0') {
		*start++ = *end++;
	}
	*start = 0;
	return word;
}

void testchamber() {
	srand(time(NULL));
	const char* sdel[] = { "Alexander","Germany","Dragon_Maid","9419942","12343","s@11ffs","Enigm@dd","kElH sI5","Ma7","aaab" };
	char stemp[256] = { "" };
	int p = rand() % 5;
	int k = rand() % 6 + 1;
	int test = sizeof(sdel) / sizeof(char*);
	printf("\nFunciton \"STRDEL\" search.test:");
	for (int i = 0; i < test; ++i) {
		printf("\nTest %i:\n", i + 1);
		strcpy(stemp, sdel[i]);
		printf("strdel1 { %s =del=> %s <-- p = %i, k = %i }\n", sdel[i], strdel1(stemp, p, k), p, k);
		strcpy(stemp, sdel[i]);
		printf("strdel2 { %s =del=> %s <-- p = %i, k = %i }\n", sdel[i], strdel2(stemp, p, k), p, k);
		strcpy(stemp, sdel[i]);
		printf("strdel3 { %s =del=> %s <-- p = %i, k = %i }\n", sdel[i], strdel3(stemp, p, k), p, k);
		strcpy(stemp, sdel[i]);
		printf("strdel4 { %s =del=> %s <-- p = %i, k = %i }\n", sdel[i], strdel4(stemp, p, k), p, k);
	}
}

int main() {
	const char word1[] = { "Domashniy" };
	char word2[256] = { "" };
	int p = 2;
	int k = 4;
	strcpy(word2, word1);
	printf("Strdel1: { %s }\n", strdel1(word2, p, k));
	strcpy(word2, word1);
	printf("Strdel2: { %s }\n", strdel2(word2, p, k));
	strcpy(word2, word1);
	printf("Strdel3: { %s }\n", strdel3(word2, p, k));
	strcpy(word2, word1);
	printf("Strdel4: { %s }\n", strdel4(word2, p, k));
	testchamber();
}