Bitwise operation

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.

Code:

---

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

---

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

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().

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

thank you very much. %u works.