strToInt和intToStr的自我定义

#include <stdio.h>#include <stdlib.h>#include <iostream>using namespace std;char* IntToStr(int& Number, char*& str){char ch, *left, *right;left = right = str;//求绝对值unsigned int value = 0;if(Number < 0){        value = - Number;        *str = '-';left++; right++;}else{value = (unsigned int)Number;}//转换成字符串while(value){*right = value % 10 + '0';value = value/10;right++;}*right = '\0';//倒转right--;while(right>left){ch = *left;*left++ = *right;*right-- = ch;}return str;}int strToInt(char*& str){int i =0;int num = 0;int len = strlen(str);if (*str == '-'){i++;}while(i<len){num = num*10 +(str[i] - '0');i++;}if (*str == '-'){return -num;}else{return num;}}int main(int argc, char* argv[]){char *str = (char *)malloc(12*sizeof(char));memset(str, 0, 12*sizeof(char));int i = -1234;char* s = IntToStr(i,str);puts(s);free(s);s = "-4321";int num = strToInt(s);printf("%d\n",num);}