#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int lenstr(char *); //length of string
int stoi (char *);

int main (int argc, char **argv)
{
    fprintf(stdout, "strlen: argv1 is %u chars long\n", strlen(argv[1]));
    fprintf(stdout, "lenstr: argv1 is %u chars long\n", lenstr(argv[1]));


    fprintf(stdout, "atoi %d\n", atoi(argv[1]));
    fprintf(stdout, "stoi %d\n", stoi(argv[1]));
    return(0);
}

int lenstr (char *string)
{
    int count = 0;

    while(string[count] != '\0')
    {
       count++;
    }
    return(count);
}

int stoi (char *string)
{
    int place = 1;
    int index = 0;
    int value = 0;                                                            

    for ( index = (lenstr (string) - 1); index >= 0; index--)
    {
       value = value + ((string[index] - '0') * place);
       place = place * 10;
    }
    return(value);
}