C++ Tutorial => unsigned

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Example

A type specifier that requests the unsigned version of an integer type.

When used alone, int is implied, so unsigned is the same type as unsigned int.
The type unsigned char is different from the type char, even if char is unsigned. It can hold integers up to at least 255.
unsigned can also be combined with short, long, or long long. It cannot be combined with bool, wchar_t, char16_t, or char32_t.

Example:

char invert_case_table[256] = { ..., 'a', 'b', 'c', ..., 'A', 'B', 'C', ... };
char invert_case(char c) {
    unsigned char index = c;
    return invert_case_table[index];
    // note: returning invert_case_table[c] directly does the
    // wrong thing on implementations where char is a signed type
}

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