#include <cstdlib>
#include <cstdio>
#include <cerrno>
#include <cstring>
 
int main()
{
    char str[] = " 2 365  2344jim 1234444444444444444444567 43";
 
    for (char * e = str; *e != '\0'; )
    {
        errno = 0;
        char const * s = e;
        unsigned long int n = strtoul(s, &e, 0);
 
        if (errno)                       // conversion error (e.g. overflow)
        {
            std::printf("Error (%s) encountered converting:%.*s.\n",
                        std::strerror(errno), e - s, s);
            continue;
        }
 
        if (e == s) { ++e; continue; }   // skip inconvertible chars
 
        s = e;
 
        printf("We read: %lu\n", n);
    }
}

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