《c程序设计语言》读书笔记-字符型0-9转为数字0-9

#include <stdio.h>#define Num 10int atoi(char s[]);int main(){    int c,i = 0;    char s[Num];    int result;    while((c = getchar()) != EOF && c != '\n' && i < Num)    {        s[i] = c;        i++;    }    result = atoi(s);        printf("%d\n",result);        return 0;}int atoi(char s[]){    int i,n = 0;    for(i = 0;s[i] >= '0' && s[i] <= '9';i++)    {        n = 10*n + (s[i] - '0');    }     return n;}