C++ 字符串转换整型和整型转换成字符串

字符串转整型

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

int string2int(string str){
    stringstream ss;
    ss << str;
    int result;
    ss >> result;
    return result;
}

int main() {
    string str="123";
    int result = string2int(str);
    cout << result << endl;
    return 0;
}

整型转字符串

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

string int2string(int num){
    stringstream ss;
    ss << num; //将数字传入流中
    string result;
    ss >> result; //将流中的值写入到result中
    return result;
}

int main() {
    int num = 123;
    string result = int2string(num);
    cout << result << endl;
    return 0;
}