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thanks for that..works perfectly.

ok, im trying to write a function that does a "circular shift" i.e: left shifts "a" by "n" positions, where high order bits are introduced as low order bits.

eg:

10000001 circular shift 1...

thanks for that explanation sayeh, i understand it all now.

thanks for that ozgulker.

works like a charm

ok here is my modification of his code (but it still doesnt work :D)

anyone care to debug it for me?

#include <stdio.h>

int main()
{
unsigned long newlong;
unsigned long...

sayeh, what exactly do the lines

scratch <<= ((7-i)*4);

newlong &= scratch;

do in the code you wrote in your reply?

How do I pack 8 4-bit binary numbers into a long int?
The program is to take an input string of 8 ascii charcaters, (digits 0 to 9 only), convert them to their 4 bit binary equivilants and pack them...