Challenge data structure and algorithm surface questions--continuous longest number string __java

Topic source "Data structure and algorithm surface test 80". Here gives my solution, if you have a better solution, welcome message.

Problem Analysis: String processing, judging each bit is not a number, using the function isdigit

Method:

int Continumax (char *outputstr, char * inputstr) {
    if (NULL = = Inputstr) return 0;

    char *p = inputstr;
    Char *q = inputstr;//Record the start of the longest string
    int length = 0;
    int max_len = 0;//record the maximum length
    while (*p! = ') {
        if (!isdigit (*p)) {
            length = 0;
            p + +;
            Continue;
        }

        length + +;
        if (length > Max_len) {
            Max_len = length;
            Q = p-length + 1;
        }
        p + +;
    }
    int i = 0;
    for (i = 0; i < Max_len; i++) {
        outputstr[i] = *q;
        Q + +;
    }
    Outputstr[i] = ' + ';
    return max_len;
}