What does signed and unsigned values mean?

Question

What does signed mean in C? I have this table to show:

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Answer 1

A signed integer can have both negative and positive values. While a unsigned integer can only have positive values.

For signed integers using two's complement , which is most commonly used, the range is (depending on the bit width of the integer):

char s -> range -128-127

Where a unsigned char have the range:

unsigned char s -> range 0-255