/*=============================================================================
#
#     FileName:   stringToNo.c
#     Algorithm:  将字符串转化为对应的整型数值
#     Author:     Knife
#     Created:    2014-06-22 20:37:36
#
=============================================================================*/
#include<stdio.h>
#include<string.h>
int atoi(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;
}void main(){char charArr[] = "4562";int number = atoi(charArr);    printf("%d\n",number);
}

/*=============================================================================
#
#     FileName:   noToString.c
#     Algorithm:  将整型数值转化成字符串
#     Author:     Knife
#     Created:    2014-06-22 20:37:36
#
=============================================================================*/
#include<stdio.h>
#include<string.h>
#define MAX 100//字符串逆转
void reverse(char* charArr){int j, k, tmp;j = 0;k = strlen(charArr)-1;for(; j < k; j++, k--){tmp = charArr[j];charArr[j] = charArr[k];charArr[k] = tmp;}
}void itoa(int n, char* charArr){int tmpN, i, sign;i = 0;//判断是否为负数if((sign = n) < 0){n = - n;}//循环while(n > 0){tmpN = n % 10;n = n / 10;charArr[i++] = tmpN + '0';}if(sign < 0){charArr[i++] = '-';}charArr[i] = '\0';reverse(charArr);
}void main(){int n = -456;char charArr[MAX];itoa(n, charArr);printf("%s\n", charArr);
}

/*=============================================================================
#
#     FileName:   noToString2.c
#     Algorithm:  将整型数值转化成字符串（扩展版）
#     Author:     Knife
#     Created:    2014-06-22 20:48:36
#
=============================================================================*/
#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#define MAX 100//字符串逆转
void reverse(char* charArr){int j,k,tmp;j = 0;k = strlen(charArr)-1;for(; j < k; j++, k--){tmp = charArr[j];charArr[j] = charArr[k];charArr[k] = tmp;}
}void itoa(int n, char* charArr){int tmpN, i, sign;i = 0;sign = n;//循环do{charArr[i++] = abs(n % 10) + '0';}while (n /= 10);if(sign < 0){charArr[i++] = '-';}charArr[i] = '\0';//字符串逆转
    reverse(charArr);
}void main(){int n = INT_MIN;char charArr[MAX];itoa(n, charArr);printf("%s\n", charArr);
}