what is the bug of this code

[AliBahar]

Hi
when I compiled this code in visual studio the num1 equals with 4.
and if I changed the size of data array the previous value is appeared and it is not changed.

#include "stdio.h"
char data[]={0x11, 0x12, 0x14, 0x12};

char sizeCount(char *ptr){	
	static char num;
	num=sizeof(ptr);
	return num;
}
int main(void){
	char num1;
	num1=sizeCount(data);
	printf("%d", num1);
	getchar();
	return 0;
}

 

[jure8479]

Hi,
I think you are using the sizeof operator in a wrong way.
Please read this: https://msdn.microsoft.com/en-us/library/4s7x1k91.aspx

 

[FvM]

sizeof() is returning the size of the pointer, which is 32 bit. There's no way to find the size of the referenced data object from a pointer.