how to manipulate values at the ports

"but in the example, P0=j was given where j is a hexa no. ..."

There is more than one example. Here's another:

sbit P0_6 = P0^6;

void main(void) {
    P0_6 = k;   /* 'k' defined elsewhere */
    for (;;);
}

"but in the example, P0=j was given where j is a hexa no. ..."

There is more than one example. Here's another:

sbit P0_6 = P0^6;

void main(void) {
    P0_6 = k;   /* 'k' defined elsewhere */
    for (;;);
}

sbit P0_6 = P0^6;

would u please explain me the operation of this instruction.i am a beginner and i dont know the commands like P0^6

http://www.keil.com/support/man/docs/c51/c51_le_sbit.htm

thanq very much

... read "the bible"

here are the links to "the bible"
Chapter 1 - 80C51 Family Architecture:
Chapter 1 - 80C51 Family Architecture:
www.nxp.com/.../80C51_FAM_ARCH_1.pdf
Chapter 2 - 80C51 Family Programmer's Guide and Instruction Set:
www.nxp.com/.../80C51_FAM_PROG_GUIDE_1.pdf
Chapter 3 - 80C51 Family Hardware Description:
www.nxp.com/.../80C51_FAM_HARDWARE_1.pdf