Int to string

[Edoks]

So basically I want to convert a birth date, set to integers, and I want to convert it into a string. I recently got into object programming and created a method that would convert the date of birth into a string to print it

User.h
#pragma once
#include <string>
#include <iostream>
using std::cout;
using std::string;
class User
{
private:
string name;
string surname;
string place_birth;
int day;
int month;
int year;

public:
//setter e getter del name, surname, place birth and birth date
User();
User(string name, string surname, string place_birth, int day, int month, int year);

//Getter date birth
string get_date_birth();

//getter del palce birth
string get_pbirth();

//get user date
string get_User_Date();
};

---------------------------------------------------------

User.cpp
#include "Utente.h"

User::User(){
this-> name=" ";
this-> surname=" ";
this-> place_birth=" ";
this-> day=0;
this-> month=0;
this-> year=0;
}

User::User(string nome, string cognome, string luogo_nascita, int gg, int mm, int aa){
this->name=name;
this->surname=surname;
this->place_birth=place_birth;
this->day=day;
this->month=month;
this->year=year;
}

string User::get_date_birth(){
return "Date of birth>> " + std::to_string(this->date) + "/" + std::to_string(this->month) + "/" + std::to_string(this->year);[/b][/b][/b]
}

std::string User::get_pbirth(){
return place_birth;
}

string User::get_User_Date(){
cout<<"name>> "<<this->name<<std::endl;
cout<<"surname>> "<<this->surname<<std::endl;
cout<<"place of birth>> "<<this->place_birth<<std::endl;
return 0;
}

when i want print get_date_birth he take me this
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid

[momo1014]

I've write a int to string function in C, you can take a look at it.

#include <stdio.h>
 
void int_to_str(int num,char* s_r)
{
    char s[100];
    int add_num;
    int num_len = 0;
    for (int i=0;num > 0;i++)
    {
        num_len++;
        add_num = (num%10)+'0';
        s_r[i] = add_num;
        num = num/10;
 
    }
    for (int i=0; i<num_len; i++)
    {
        s[i] = s_r[num_len-i-1];
    }
    for (int i=0; i<num_len; i++)
    {
        s_r[i] = s[i];
    }
    //s_r[num_len+1] = '\0';
 
}
 
int main()
{
    int a;
    scanf("%d",&a);
    char s[100];
    int_to_str(a,&s);
    printf("s = ");
    printf(s);
    printf("\n");
 
}
 

first define a string (array of chars) and pass its POINTER to int_to_string(), along with the number you want to convert. The result will be stored in the array you passed.

I hope this can help. If it dose't work, don't take it to seriously. I've just began to learn C and not very good it (and not very good at English aswell).