C/stdlib.h/strtoul

strtoul: converts the string into an unsigned long int according to the base of the number

<source lang="cpp">

//Header: #include <stdlib.h> //Declaration: unsigned long int strtoul(const char *start, char **end, int radix);

1. include <stdlib.h>

int main(void){

   char *start, *end;
   char a[100];
   end = a;
   *start= "12341234";
   printf("%d", strtoul(start, &end, 8));

}

/*0*/

      </source>