unsigned char

Question

hello , i dont understande what does mean unsigned char , i know unsigned char only with number  , can some one of you help me please ?

Answer 1

we know that char  has 8 bits so in a signed char only 7 bits are used for data and 1 is used for  the sign but in unsigned char all 8 bits are used for data and their is no sign bit

#include <stdio.h>    int main() {        int chr = 97;     unsigned char i = chr;     printf("unsigned char: %c\n", i);        return 0; }

Output:

unsigned char: a

Comments

Not quite so. The sign bit is also data.

Your code produces the exact same output if you'd use signed char (for the type of i).

Answer 2

The numeric value of an unsigned char ranges from 0..255.

The numeric value of a signed char ranges from -128..127.

So if you do not wish to store "classic" characters (e.g. 'a', 'b', etc...) in a char, then consider the number you want to store in it, what the maximum and minimum is, would you need to support negative numbers. The default is signed char, if signed/unsigned is not specified.