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Creating own strcmp and strcmpi

karlsanada13 (8)
We are asked to make our own function for strcmp and strcmpi. This is probably wrong, I'm quite clueless about this. All I know is that if the two strings are equal, it will return 0 value and so on.

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#include<iostream>

using namespace std;

int ownstrcmp (char str1[], char str2[])
{

	if (str1 == str2)
	{
		return 0;
	}
	else if (str1 > str2)
	{
		return +1;
	}
	else
	{
		return -1;
	}
	
	
}

int ownstrcmpi (char str1[], char str2[])
{
	
	if (str1 == str2)
	{
		return 0;
	}
	else
	{
		return 1;
	}
}
void main()
{
	char username[100], password[100], uName[100], pWord[100];
	int choice;

	do
	{
		cout<<"Students Account\n1) Create\n2) Log-In\n3) Exit"<<endl<<endl;
		cout<<"Choose: ";
		cin>>choice;
		flushall();
		switch(choice)
		{
			case 1:
					int checkUsername;
					do
					{
						checkUsername = 1;
						cout<<"Enter UserName: ";
						gets(username);
						int len = strlen(username);
						int i = 0;
						while(i < len)
						{
							if(!isalnum(username[i]))
							{
								checkUsername = 0;
								break;
							}
							i++;
						}
					}while(checkUsername == 0);
					int checkPassword;
					do
					{
						checkPassword = 1;
						cout<<"Enter Password: ";
						gets(password);
						int len = strlen(password);
						int i = 0;
						while(i < len)
						{
							if(isspace(password[i]))
							{
								checkPassword = 0;
								break;
							}
							i++;
						}
					}while(checkPassword == 0);
					break;
			case 2:
					cout<<"Username: ";
					gets(uName);
					flushall();
					cout<<"Password: ";
					gets(pWord);
					flushall();
					if(ownstrcmp(pWord,password) == 0 && ownstrcmpi(uName,username) == 0)
					{
						cout<<"Access Allowed"<<endl;
					}
					else
					{
						cout<<"Invalid username or password"<<endl;
					}
					break;
			case 3:
					cout<<"Program Terminated"<<endl;
					break;
		}
	}while(choice != 3);
	cout<<endl;
	system("Pause");
}
karlsanada13 (8)
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#include<iostream>

using namespace std;

int ownstrcmp (char str1[], char str2[])
{
	char x = 0;

	if (str1[x] == str2[x])
	{
		return 0;
	}
	else if (str1[x] > str2[x])
	{
		return +1;
	}
	else
	{
		return -1;
	}
	
	
}

int ownstrcmpi (char str1[], char str2[])
{
	int x = 0;
	if (str1[x] == str2[x])
	{
		return 0;
	}
	else
	{
		return +1;
	}
}
void main()
{
	char username[100], password[100], uName[100], pWord[100];
	int choice;

	do
	{
		cout<<"Students Account\n1) Create\n2) Log-In\n3) Exit"<<endl<<endl;
		cout<<"Choose: ";
		cin>>choice;
		flushall();
		switch(choice)
		{
			case 1:
					int checkUsername;
					do
					{
						checkUsername = 1;
						cout<<"Enter UserName: ";
						gets(username);
						int len = strlen(username);
						int i = 0;
						while(i < len)
						{
							if(!isalnum(username[i]))
							{
								checkUsername = 0;
								break;
							}
							i++;
						}
					}while(checkUsername == 0);
					int checkPassword;
					do
					{
						checkPassword = 1;
						cout<<"Enter Password: ";
						gets(password);
						int len = strlen(password);
						int i = 0;
						while(i < len)
						{
							if(isspace(password[i]))
							{
								checkPassword = 0;
								break;
							}
							i++;
						}
					}while(checkPassword == 0);
					break;
			case 2:
					cout<<"Username: ";
					gets(uName);
					flushall();
					cout<<"Password: ";
					gets(pWord);
					flushall();
					if((ownstrcmp(pWord,password) == 0 && ownstrcmpi(uName,username) == 0))
					{
						cout<<"Access Allowed"<<endl;
					}
					else
					{
						cout<<"Invalid username or password"<<endl;
					}
					break;
			case 3:
					cout<<"Program Terminated"<<endl;
					break;
		}
	}while(choice != 3);
	cout<<endl;
	system("Pause");
}


Updated version. Still, the strcmp is not case-sensitive.>.>
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