Changing String Variables into int in C++

Question

I was trying to change a variable called username in my code. This is what it looked like:

string username = "name";
username = 1;
cout<<username;

And once I ran that code, it had an output of a ? in a box.
I am wondering how to fix it, not what the ? in a box means.

Answer 1

What output were you expecting?

⍰ indicates that the character cannot be displayed by the character set you are using.

Despite it being supposed to raise a compilation error, it doesn't output anything for me on Sololearn playground (Android).

Answer 2

Ashton Hively what I think you are asking is how to make cout show what you assigned to the string. The int value 1 is stored there, and you want it to display as 1 instead of the nonprintable ASCII character 1.

Here is how: cast it as an (int) in the cout stream.

cout<<(int)username;

Well... not quite right. That fails, too. Since a string object has an array of characters, it stores your assigned value of 1 inside the array. You have to pull the stored value from its index location of 0.

cout<<(int)username[0];

That works. Output: 1

Answer 3

The compiler will try ti cast an int to char then create a string from latter.
In practice, assigning an int to string will create first a char having the int ascii code the will be created a string with that char.

Answer 4

you declared a string variable.
then you assign an int to it. this will raise an error.

maybe you should assign a string instead?
username = "1";

or if you want to input a new value instead:
cin >> username;

i am unclear on what you're trying to do...

Answer 5

It could be done this way...

string username = "name";
username = to_string(1);
cout << username;

Answer 6

string username = "name" ;
username = to_string(1);
cout<<username ;

Answer 7

you would do
int username = 1;
because i think 1 cant be in a string

Answer 8

Jan method is modern but note that it raises a runtime error if there's at least a non digit in the string sequence

but on the other side, your question description makes no sense

Answer 9

My understanding is
String username="name";
Username=string(1);
cout<<username