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<pre><code class="language-cpp">#include<iostream>
#include<cstring>

bool SafeCheck(char dest[], const unsigned int destSize, const char resource[], const unsigned int resourceSize)
{
	using namespace std;

	int destIndex = 0;
	int srcIndex = 0;
	// Safe Check
	while (destIndex < destSize && dest[destIndex] != '\0')
		destIndex++;

	// destSize와 같으면 \0을 만나지 못했다는 뜻이니
	// 이상함을 감지하고 다시 초기화 해달라고 부탁한다.
	if (destIndex >= destSize)
	{
		cout << "Try again destination initialization..." << endl;
		return false;
	}

	// resource배열이 제대로 들어왔는지 확인
	while (srcIndex < resourceSize && resource[srcIndex] != '\0')
		srcIndex++;

	// resourceSize와 같으면 \0을 만나지 못했다는 뜻이니
	// 이상함을 감지하고 다시 초기화 해달라고 부탁한다.
	if (srcIndex >= resourceSize)
	{
		cout << "Try again resource initialization..." << endl;
		return false;
	}

	return true;
}

void StrCpy_s(char dest[], const unsigned int destSize, const char resource[], const unsigned int resourceSize)
{
	using namespace std;

	if (SafeCheck(dest, destSize, resource, resourceSize) == false)
		return;

	if (destSize < resourceSize)
	{
		cout << "You can not push in destination array beacause lack memory space" << endl;
		return;
	}

	for (int i = 0; i < resourceSize; i++)
	{
		dest[i] = resource[i];
	}

	cout << "StrCpy Result : " << dest << endl;
}

void StrCat_s(char dest[], const unsigned int destSize, const char resource[], const unsigned int resourceSize)
{
	using namespace std;
	
	if (SafeCheck(dest, destSize, resource, resourceSize) == false)
		return;

	int startIndex = 0;
	while (dest[startIndex] != '\0') startIndex++;

	for (int i = 0; i < resourceSize; i++)
	{
		int checkIndex = startIndex + i + 1;
		// nextIndex는 다음 인덱스를 확인하기 위한 변수
		// nextIndex가 destSize사이즈 보다 크거나 같으면
		// 공간 부족 마지막에 \0찍어서 마무리
		if ((checkIndex) == destSize)
		{
			dest[destSize - 1] = '\0';
			continue;
		}
		else if( checkIndex > destSize)
		{
			cout << "You can not push in destination array beacause lack memory space" << endl;
			return;
		}

		dest[startIndex + i] = resource[i];
	}

	cout << "StrCat Result : " << dest << endl;
}

int StrCmp(char dest[], const unsigned int destSize, const char resource[], const unsigned int resourceSize)
{
	if (SafeCheck(dest, destSize, resource, resourceSize) == false)
		return 1;

	for (int i = 0; i < destSize; i++)
	{
		if (dest[i] != resource[i])
		{
			if (dest[i] < resource[i])
				return -1;
			else
				return 1;
		}

		if (dest[i] == '\0' && resource[i] == '\0')
			return 0;
		else if (dest[i] == '\0' || resource[i] == '\0')
		{
			return dest[i] == '\0' ? -1 : 1;
		}
	}
}

int main()
{
	using namespace std;

	char myString[12]{};
	char strA[] = "Hello";
	char strB[] = "World";
	char strC[] = "HelloWorld";

	unsigned int myStringSize = sizeof(myString) / sizeof(char);
	unsigned int strASize = sizeof(strA) / sizeof(char);
	unsigned int strBSize = sizeof(strB) / sizeof(char);
	unsigned int strCSize = sizeof(strC) / sizeof(char);

	StrCpy_s(myString, myStringSize, strA, strASize);
	StrCat_s(myString, myStringSize, strB, strBSize);

	int result = StrCmp(myString, myStringSize, strC, strCSize);
	if ( result == 0)
		cout << "Same Text" << endl;
	else
	{
		cout << "result	: " << result << endl;
		cout << "Diffrent Text" << endl;
	}

	return 0;
}</code></pre><p style="text-align: left">다시 생각해서 한번 작성해봤습니다.</p>

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