Example: unsigned

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.

    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