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Int to string

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

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

//setter e getter del name, surname, place birth and birth date
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();


#include "Utente.h"

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){

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
Dec 16 '22 #1
1 12090
4 Nibble
I've write a int to string function in C, you can take a look at it.
Expand|Select|Wrap|Line Numbers
  1. #include <stdio.h>
  3. void int_to_str(int num,char* s_r)
  4. {
  5.     char s[100];
  6.     int add_num;
  7.     int num_len = 0;
  8.     for (int i=0;num > 0;i++)
  9.     {
  10.         num_len++;
  11.         add_num = (num%10)+'0';
  12.         s_r[i] = add_num;
  13.         num = num/10;
  15.     }
  16.     for (int i=0; i<num_len; i++)
  17.     {
  18.         s[i] = s_r[num_len-i-1];
  19.     }
  20.     for (int i=0; i<num_len; i++)
  21.     {
  22.         s_r[i] = s[i];
  23.     }
  24.     //s_r[num_len+1] = '\0';
  26. }
  28. int main()
  29. {
  30.     int a;
  31.     scanf("%d",&a);
  32.     char s[100];
  33.     int_to_str(a,&s);
  34.     printf("s = ");
  35.     printf(s);
  36.     printf("\n");
  38. }
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).
Apr 30 '23 #2

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