C dynamic memory allocation

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void main()
{
	long int *ptr;
	clrscr();
	ptr=(long int*)malloc();
	*ptr=123456789;
	printf("%ld",*ptr);
	getch();
}

here I have not defined the size of malloc than also
it printing what is the reason

What I have tried:

output on the console is 123456789

Posted 17-Nov-17 20:10pm

keshav desai

Updated 17-Nov-17 22:00pm

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Richard MacCutchan 18-Nov-17 5:35am

That should not even compile as malloc requires a parameter giving the required size in bytes.

keshav desai 18-Nov-17 6:46am

It is compiling without any error or warning I use turbo C compiler

Richard MacCutchan 18-Nov-17 6:54am

Then you should check the turbo C documentation on malloc to see what results to expect when you do not provide a size value.

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Patrice T · Answer 1 · 2017-11-17T22:00:00

Solution 1

Quote:
here I have not defined the size of malloc than also
it printing what is the reason

Checking the dynamic memory allocation is your duty, making proper usage of malloc() is your responsability.
C will accept anything until it crash.

Advice: read malloc() documentation.

Posted 17-Nov-17 22:00pm

Patrice T