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T O P I C    R E V I E W
alkamid Posted - 10/19/2010 : 08:18:03 AM
Hello,

Is something wrong with my code here?
if(exist(Bookg1) == 0)
{
	string litera$ = "g";
}
else
{
	if(exist(Bookj1) == 0)
	{
		string litera$ = "j";
	}
	else
	{
		if(exist(Bookm1) == 0)
		{
			string litera$ = "m";
		}
		else
		{
			if(exist(Booko1) == 0)
			{
				string litera$ = "o";
			}
			else
			{
				if(exist(Bookr1) == 0)
				{
					string litera$ = "r";
				}
				else
				{
					if(exist(Bookt1) == 0)
					{
						string litera$ = "t";
					}
					else
					{
						type -a "out of range";
					}
				}
			}
		}
	}
}
litera$=;

With the last command I get #Command Error!. Why?
4   L A T E S T    R E P L I E S    (Newest First)
alkamid Posted - 10/19/2010 : 11:45:02 AM
Of course, sorry for missing that and thank you for your patience and help. It works properly now.

Thanks!
larry_lan Posted - 10/19/2010 : 11:42:16 AM
Hi:

You should not re-declare the variable again inside "{ }". Please see my example above, I didn't declare the variable inside IF statement. That is, I use "litera$ = "g";", NOT "string litera$ = "g";".

P.S, There is a chapter, Scope of Variables, in our LabTalk document. Maybe that will help.

Larry
alkamid Posted - 10/19/2010 : 11:35:19 AM
I changed it to:
string litera;
if(exist(Bookg1) == 0)
{
	string litera$ = "g";
}
else
{
	if(exist(Bookj1) == 0)
	{
		string litera$ = "j";
	}
	else
	{
		if(exist(Bookm1) == 0)
		{
			string litera$ = "m";
		}
		else
		{
			if(exist(Booko1) == 0)
			{
				string litera$ = "o";
			}
			else
			{
				if(exist(Bookr1) == 0)
				{
					string litera$ = "r";
				}
				else
				{
					if(exist(Bookt1) == 0)
					{
						string litera$ = "t";
					}
					else
					{
						type -a "out of range";
					}
				}
			}
		}
	}
}
litera$=;


Unfortunately, it still doesn't work (there's no value assigned to litera$).
larry_lan Posted - 10/19/2010 : 10:18:00 AM
You declare the variable, litera$, inside the brace, which means that you can only visit it within the scope of "{ }". You should have script like:

string litera;
if(...)
{
litera$ = "g";
}
else
{
...;
}
litera$ = ;

Larry
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