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m2zt

18

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Joined: 12th Nov 2005

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Posted: 28th Oct 2006 04:47

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I am trying to understand strings and characters in C++ but im not getting anywhere when using dbInput();

+ Code Snippet

#include "DarkGDK.h"

void DarkGDK ( void )
{

dbSetTextSize(8);
dbSetWindowSize(1000,1000);
char *answer;

char *mmm = "m2zt";

while ( LoopGDK ( ) )
{ 

dbPrint("Answer?");
answer = dbInput();

if (answer == mmm)
{

dbPrint("Correct!");

}

dbWaitKey();



dbSync();
}
}

When i input m2zt and compare it with mmm it doesnt work. So i tried having answer = "m2zt" and compare it and it does work. So I am a bit confused on what to do with dbInput.

Futurama 2008

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Morcilla

21

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Joined: 1st Dec 2002

Location: Spain

Posted: 28th Oct 2006 18:35

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I'm not sure if you can store a string into a pointer to a char (but point to its address). And definitively I'd use C string functions to compare them, rather than '='.

Please check this working one, based on yours:

+ Code Snippet

#include "DarkGDK.h"

void DarkGDK ( void )
{

dbSetTextSize(8);
dbSetWindowSize(1000,1000);

char answer[256]; //instead of char *answer;

char mmm[256];    //instead of char *mmm;

strcpy(mmm, "m2zt\0"); //instead of mmm = "m2zt";

while ( LoopGDK ( ) )
{ 

dbPrint("Answer?");

strcpy(answer, dbInput()); //instead of answer = dbInput();


if (strcmp(answer, mmm)==0) //instead of if (answer == mmm)
{

	dbPrint("Correct!");

}
else
{
	dbPrint("Incorrect!");

}

dbPrint();
dbPrint("--Press a key--");

dbWaitKey();

dbSync();
}
}

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m2zt

18

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Joined: 12th Nov 2005

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Posted: 28th Oct 2006 23:34

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Thanks, that helps alot.

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Miguel Melo

18

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Joined: 8th Aug 2005

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Posted: 29th Oct 2006 00:56

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Morcilla, you can have

+ Code Snippet

char *mmm = "m2zt";

That just statically allocates the string and makes mmm point to it. The problem with his code was just with the "==" as you pointed out.

That would only yield true if both pointers pointed to the very same address in memory. It will return false if both pointers point to diff mem places even if they both contain the same sequence of characters.

I have vague plans for World Domination

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Morcilla

21

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Joined: 1st Dec 2002

Location: Spain

Posted: 29th Oct 2006 11:09

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Miguel, that makes sense, good to know.

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Dark GDK / Input help