How to implement binary addition in c++?

[maxstoto]

please guide me....i didnt know how to implement its...

my situation is like this :-

let say that i have 11111010..... And i want to move the left most side of binary number and add with the 4 bits in the right side, so its can be like this

. 1010
+ 1111

so..please help me and guide me, how can i implement like this in c++ programming...

[mrnutty]

How are you representing the binary numbers?

[rubberman]

From your description, you are using 8-bit values, and want to extract the high and low nibbles (4 bits), turn them into 4-bit values, then add them together? Is that correct? If so, then what you want to is a mask and shift operation. Example:

unsigned char ch = 11111010b; // unsigned 8-bit value
unsigned char top = (ch & 0xF0) >> 4; // Mask off bottom 4 bits and shift right
unsigned char bottom = (ch & 0x0F);   // Mask off top 4 bits - no need to shift
unsigned int results = top + bottom;  // Add top and bottom values