[SOLVED] Problem in default arithmetic for ' i ' variable.

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WhyWhy

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Hi guys,

I not set any arithmetic such as int,char or float for the ' i ' variable.When execute the program still the having delay function,so the default arithmetic for the i will be int,char or float ?



Regards,
YY
 

Hi you are using which compiler?? no C compiler declares the variables by default, You have to mention it to be a variable. There is no way compiling this program without i being global variable...

Seeing at value of i compared with 20000 It shd be an int value..
 

HI Guys,

But the program is run successfully,that is the reason why i asking here...

Regards,
YY
 

redefine this variable and check wheather warning is there or not
and check the included file is same which one your checking.
 

Some compilers will assume a default and give a warning rather than error - check the compile warnings. You have not said which compiler.

Keith
 

Try this:

Code: 
//**********************************************************************************************************
// Hitech C
//**********************************************************************************************************
#include <pic.h>
//**********************************************************************************************************
__CONFIG ( FOSC_XT & WDTE_OFF & PWRTE_OFF & CP_OFF );
//**********************************************************************************************************
void delay()
{
unsigned int i;
	for (i =0; i<20000; i++)
	{
		NOP();
	}
}
//**********************************************************************************************************
void main()
{
		TRISB = 0;
		PORTB = 0;
		while(1)
		{
			CLRWDT();
			RB0=0;
			delay();
			RB0=1;
			delay();
		}
}
//**********************************************************************************************************

Or this

Code: 
//**********************************************************************************************************
// Hitech C
//**********************************************************************************************************
#include <pic.h>
//**********************************************************************************************************
__CONFIG ( FOSC_XT & WDTE_OFF & PWRTE_OFF & CP_OFF );
//**********************************************************************************************************
#ifndef _XTAL_FREQ
 // Unless already defined assume 4MHz system frequency
 // This definition is required to calibrate __delay_us() and __delay_ms()
 #define _XTAL_FREQ 4000000
#endif
//**********************************************************************************************************
void main()
{
		TRISB = 0;
		PORTB = 0;
		while(1)
		{
			CLRWDT();
			RB0=0;
			__delay_ms(200);
			RB0=1;
			__delay_ms(200);
		}
}
//**********************************************************************************************************
 
Last edited:

Venkadesh_M said:
But How could the program running correctly by taking i as a variable??
Click to expand...

i should be a variable - an 'int'. Some compilers will assume undeclared ones are 'int'. XC16 does that if you don't include a function prototype but it does warn you. You can probably change the settings so it gives an error instead.

Keith
 

hey Nagkiller i think u don't understand problem because problem is he does not declare any variable i in his code and then program successfully run . bro WhyWhy mentioned post no . # 5 and i also suggest put some different variable like j , k and try it run or not ?
 

My variable is temp or something and provide same result!!!

In my compiler has error "undefined identifier "i"", if not declare a variable!!!

My version of hitech is V9.83 pro!!!

And post is #6!!!

The compiler generate hex???
 
Last edited:

keith1200rs said:
i should be a variable - an 'int'. Some compilers will assume undeclared ones are 'int'. XC16 does that if you don't include a function prototype but it does warn you. You can probably change the settings so it gives an error instead.

Keith
Click to expand...
Hi i didnt change any settings... It could declare a function, most compilers will do, but how could a variable been declared...
 

nagkiller said:
My variable is temp or something and provide same result!!!

In my compiler has error "undefined identifier "i"", if not declare a variable!!!

And post is #6!!!

The compiler generate hex???
Click to expand...

it's not your compiler generate undefined identifier "i" bro my and all c compiler is also generated same message but question is why WHYWHY said program run successfully ????



EDIT:

better way is WHYWHY put your complete project file to zip and place here.
 
Last edited:

nick703 said:
it's not your compiler generate undefined identifier "i" bro my compiler is also generated same message but question is why WHYWHY said program run successfully ????.
Click to expand...

Not only your compiler, every C compiler will do so, unless i is a controller register defined in header file..
 

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