C/C++实现string和int相互转换的常用方法总结

#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
    // String to Int
    string str = "12345";
    int num = stoi(str);
    cout << "String to Int: " << num << endl;
 
    // Int to String
    int num2 = 67890;
    string str2 = to_string(num2);
    cout << "Int to String: " << str2 << endl;
 
    return 0;
}

#include <iostream>
#include <sstream>
#include <string>
 
using namespace std;
 
int main() {
    // String to Int
    string str = "12345";
    stringstream ss(str);
    int num;
    ss >> num;
    cout << "String to Int: " << num << endl;
 
    // Int to String
    int num2 = 67890;
    stringstream ss2;
    ss2 << num2;
    string str2 = ss2.str();
    cout << "Int to String: " << str2 << endl;
 
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
 
int main() {
    // String to Int
    char str[] = "12345";
    int num = atoi(str);
    printf("String to Int: %d\n", num);
 
    // Int to String
    int num2 = 67890;
    char str2[20];
    sprintf(str2, "%d", num2);
    printf("Int to String: %s\n", str2);
 
    return 0;
}