Bitwise operation

[Justice]

I tried the following program. Hex value works allright, but the decimal value gives me some negative numbers. What do do. Please any help. Thanks in advance.

#include <stdio.h>
void main(void)
{
	unsigned x, y;
	x=0x00f0;
	y=~x;
	printf("Hex=%x\n", y);
	printf("Decimal=%d", y);
}

[tabstop]

Don't lie to printf: tell it that the number you're printing is unsigned using the proper format specifier (specifically, %u).

[robatino]

Use %u to print an unsigned int. Also main() returns int, not void, and you should put an explicit "return 0;" at the end of main().

[Dino]

Taking the 1's complement of 0x00f0 yields 0xff0f. (Or, in the case of a 4 byte int, 0xffffff0f)
With the leftmost bit being on, and the int being defined as signed by default, you'll get a negative number.

Todd

[Justice]

thank you very much. %u works.