#include <math.h>
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
    char *p, *s;
    long li;

    s = "2a4";
li = strtol(s,NULL,8);   
printf("%s in Base 8: %ld\n",s,li);
return 0;
}

2a4 in Base 8: 2