How do I go about this in c++?
So we are basically setting char variable x with 255. Then if x is less than 0 then char is unsigned, signed otherwise. Can you explain what is happening when char x = 255? Or is it as simple as storing 255 inside x?Put signed or unsigned in front when you declare it.
Or set a char to 0xFF and test to see whether it is less than zero.
char x = 0xFF;
if (x < 0) {
printf("char is unsigned\n");
} else if (x >= 0){
printf("char is signed\n");
}
To whom are you addressing your response?I think you have that reversed.
255 is 11111111 in binary.
If it is unsigned, the value is 255.
If it is signed, the value is -1, i.e. less than 0.
post #5 directed to the TS.To whom are you addressing your response?
Sorry, here is the correct code.I think you have that reversed.
255 is 11111111 in binary.
If it is unsigned, the value is 255.
If it is signed, the value is -1, i.e. less than 0.
char x = 0xFF;
if (x < 0) {
printf("char is signed\n");
} else if (x >= 0){
printf("char is unsigned\n");
}
It doesn't work this way. While it is true that whether a particular 8-bit pattern is signed or unsigned is determined by how it is interpreted, the simple fact is that the whether it is declared as signed or unsigned determines how the code generated by the compiler interprets the bit pattern.Neither. A char variable is not signed or unsigned. It contains a single character, represented by the integer values {0...255}.
While one might want to think of it as either signed or unsigned, according to the definition that is irrelevant.
If one were to persist in this thought, I would propose that char is implemented by s one byte, unsigned integer, in all systems. I believe this because in the set of values an unsigned integer can take a) there are no negative numbers and b) the maximum value in the set requires the use of all 8 bits of the byte.
As a consequence of adding int8_t, the following are true:
A byte is exactly 8 bits.
{CHAR_BIT} has the value 8, {SCHAR_MAX} has the value 127, {SCHAR_MIN} has the value -128, and {UCHAR_MAX} has the value 255.
(The POSIX standard explicitly requires 8-bit char and two's-complement arithmetic.)
From stackoverflow,How do I go about this in c++?
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