Surviving the Technical Interview

Dr. Dobb's Journal Fall 1998

By Jay Sutaria

int strlen (char *ptr) {
    int i = 0;
    if (ptr == NULL) {
       /* the real strlen doesn't handle this */
       /* case, but I do! I return -1 */
       return (-1);
    }
    while (*ptr++) != '\0') {
           i++;
    }
    return i;
}

Example 3: Implementing strlen().

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