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/************************************************************************
5.6面試例題：整數/字符串之間的轉換
************************************************************************/
#include <stdio.h>
#include <stdlib.h>

#define MAX_DIGITS_INT 10

int strToInt(char str[]) {
 int neg = 0;
 int num = 0;
 int i = 0;
 if (str[0] == ‘-‘) {
  neg = 1;
  i++;
 }
 while (str[i] != ‘\0‘) {
  num *= 10;
  num += str[i] - ‘0‘;
  i++;
 }
 if (neg == 1) {
  num *= -1;
 }
 return num;
}

void intToStr(int num, char str[]) {
 int i = 0, j = 0, neg = 0;
 //buffer big enough for largest int, - sign and ‘\0‘
 char temp[MAX_DIGITS_INT + 2];
 
 if (num < 0) {
  neg = 1;
  num *= -1;
 }

 do {
  temp[i] = ‘0‘ + (num % 10);
  num /= 10;
  i++;
 } while(num != 0);

 if (neg == 1) {
  temp[i] = ‘-‘;
  i++;
 }

 i--;
 
 while (i >= 0) {
  str[j++] = temp[i--];
 }

 str[j] = ‘\0‘;
}

int main() {
 //printf("%d", strToInt("-0"));
 char str[MAX_DIGITS_INT];
 intToStr(-123, str);
 printf("%s", str);
 return 0;
}