字符串与整数之间的互换

#include<iostream>#include<stdio.h>using namespace std;void int2string(int number,char *string2)//把数字变成字符串{char string[100];int i = 0;int j = 0;bool is_ = false; //是不是负数while (i<100) //初始化{string2[i++] = 0;}i = 0;if (number<0){number = 0 - number;is_ = true;}while (number%10>0){int n = number % 10;number = number / 10;string[i++] = n + '0';}string[i] = '\0';i = i - 1;if (is_){string2[j++] = '-';}while (i>=0) //此处不能写为string[i]{string2[j++] = string[i--];}}void string2int(char *s,int &number)//字符串转换为整数{number = 0;bool is_ = false;//是否为负数if (s==NULL){cout << "字符串为空" << endl;return;}int i = 0;if (s[0]=='-'){is_ = true;i++;}while (s[i]){if ('0'<=s[i]&&s[i]<='9'){number = number * 10 + s[i] - '0';}else{cout << "字符串不是整数" << endl;return;}i++;}if (is_){number = -number;}}int main(){int number = 1234567;char string[100] = {0};_itoa_s(number, string, 10);//itoa说是过时了。。。cout << string << endl;_itoa_s(number, string, 2); //二进制数cout << string << endl;int2string(-123456, string);cout << string << endl;string2int(string, number);cout << number << endl;;return 0;}