atoi

#include<stdio.h>

int c_atoi(const char *s)

/*
    author : kyoung chip jang
    date : 
    descript:     
    
*/

int main( int argc ,char ** argv )
{
    char *line = "1234";
    int i = c_atoi(line);
    printf(" atoi = %d \n", i );

return 0;
}
int c_atoi(const char *s )
{
    int i, n;
    n = 0;
    for (i = 0; s[i] >= '0' && s[i] <= '9'; ++i)
        n = 10 * n + (s[i] - '0');
return n;
}