Thread: Printing string bigger than the maximum size

Good evening. Why was possible to print a string with 14 bytes when I just allocated 6 bytes for it ?

Code:

 
#include <iostream> 
#include <cstring> 

using namespace std; 

const int MAXSIZE = 20; 

int main(void) 
{ 
    char name[MAXSIZE]; 
    char lastName[MAXSIZE]; 
    
    
    cout << "Enter your first name: "; 
    cin.get(name, MAXSIZE).get();
    cout << "Enter your last name: "; 
    cin.get(lastName, MAXSIZE).get();
    
    // lastName, name\0
    char *fullName = new char[strlen(name)]; 
    
    strcpy(fullName, lastName); 
    strcat(fullName, ", ");
    strcat(fullName, name); 
    
    cout << "Here's the information in a single string: " << fullName << endl; 
    
    delete fullName; 
    return 0;     
}

Code:

 
thames@semaht ~/C++/Strings $ g++ -g -Wall personinfo2.cpp -o personinfo2
thames@semaht ~/C++/Strings $ gdb -q personinfo2
Lendo símbolos de /home/thames/C++/Strings/personinfo2...concluído.
(gdb) break 26
Ponto de parada 1 at 0x400cd2: file personinfo2.cpp, line 26.
(gdb) r
Starting program: /home/thames/C++/Strings/personinfo2 
Enter your first name: thames
Enter your last name: thames

Breakpoint 1, main () at personinfo2.cpp:26
26        cout << "Here's the information in a single string: " << fullName << endl; 
(gdb) print fullName
$1 = 0x603010 "thames, thames"
(gdb) print strlen(fullName)
$2 = 14
(gdb) print strlen(name)
$3 = 6
(gdb) c
Continuando.
Here's the information in a single string: thames, thames
[Inferior 1 (process 2738) exited normally]
(gdb)