Small issues related to C ++ Initialization

# Include <string>
Class HelloWorld {

Private:
Std: string outString;
Public:
/*
HelloWorld (){
OutString = "jilichuan ";
}
*/
Void output () const {
If (this-> outString = ""){
Std: cout <"outString is NULL ";
}
Else {
Std: cout <this-> outString;
}
}
}; # Include <iostream>
# Include "helloworld. h"
Using namespace std;

Int main ()
{
Cout <"Hello world! "<Endl;

HelloWorld hw;
Hw. output ();



Return 0;

}

 

 

It is found that the string can be used by default without being initialized, and it is an empty string. It has been used in java and is not familiar with c ++. After searching, we found that in c ++, the default constructor is automatically called if the object is defined and not initialized.