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# unsigned

Used in variable declarations as a Type-Specifier to indicate that the variable cannot be marked with a negative sign. The minimum value is 0. It applies to char, int, and long data types.

The following table illustrates the difference between signed and unsigned variables.

Type | Size | Unsigned | Signed (normal)
--- | --- | --- | ---
char | 8 bits | 0 to 255 | -128 to 127
int | 16 bits | 0 to 65,535 | -32,768 to 32,767
long | 32 bits | 0 to 4,294,967,295 | -2,147,483,648 to 2,147,483,647

## Example

The following example loops through a string, str, in search of the first non-numeric character. The variable len is an unsigned type, because no negative values can be attributed to the length of a string.

Copy code

        int is_digit, i = 0;
        char * str = "1234567k89";
        unsigned int len = strlen(str);
        do {
            if (i == len) {
                lr_output_message ("No letters found in string");
                return -1;
            }
            is_digit = isdigit(str[i++]);
        } while (is_digit);
             lr_output_message ("The first letter appears in character %d of string", i);

    Example: Output:
    Action.c(18): The first letter appears in character 8 of string

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