Find the longest numeric string in the given input strings

Topic Description: For an input string, find the longest string that is full of numbers

/*find teh longest numeric String */#include <stdio.h> #include <cytpe.h> int main () {char* pos = NU
    LL;
    int maxlen =-1;
    char* CurPos = NULL;
    int curlen = 0;
    Char str[30] = {0};
    printf ("Input string\n");

    scanf ("%s", str);
    Char *p = CurPos = str;
            while (*p!= 0) {if (!isdigit (*p)) {Curlen = 0;
            CurPos = p;
        curpos++;
            else {Curlen + +;
                if (curlen>maxlen) {maxlen = Curlen;
            pos = CurPos;
    }} p++;
        } if (MaxLen) {printf ("the LOGEST numeric string is:\n");
    for (int i=0;i<maxlen;i++) printf ("%c", Pos[i]); 
    else printf ("no match result\n");
return 0;                                                                                                                           }