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Closed 7 years ago.
I have 2 chars: HIGH and LOW and I'd like to convert them to an int corresponding to HIGH + the 2 left bits from LOW.
I tried somethine like :
unsigned char high;
unsigned char low;
high = 128; // 10000000
low= 128; // 10000000
int result; (should be high 10000000 + 2 left bites of low 10 = 1000000010)
// To do
return result;
Edited for more clarity.
The solution I chosed is:
return high*4 + (low >> (CHAR_BIT - 2));
You declare HIGH and LOW as char*, but you don't use them as pointer. The following code works fine (BTW, avoid upper case identifiers when you don't use constants):
char high = 125;
char low = 12;
This is how I understand your question (it could be more understandable):
#include <limits.h>
int result = high + (low >> (CHAR_BIT - 2));
I have 2 chars, HIGH and LOW, and I'd like to convert them to an int corresponding to HIGH + the 2 left bits from LOW.
Your specification is not clear. Given:
unsigned char HIGH = 152;
unsigned char LOW = 12;
It could mean:
int result = HIGH + (LOW >> 6); // Assuming CHAR_BIT == 8
Or it could mean:
int result = HIGH + (LOW & 0xC0);
Or it could mean:
int result = (HIGH << 2) | (LOW >> 6);
Or it could have some other meaning. For the values shown in the question, the first two expressions produce the same answer.
To get a more meaningful answer, you'll have to spell out the requirements much more carefully. Your actual code bears almost no discernible relationship to the requirement you specify. You have two char * variables; you initialize them to what are almost certainly invalid addresses; you don't initialize result. Your computations are, at best, odd.
