CODEWITHSUNDEEP
c++string
NiteLite
NiteLite

Reputation: 21

How to add or change value for a declared string using string(int, char) function?

I know there is a way to give a value of a specific character being repeated n times to a string while declaring it, like this:

string example(int, char);

But what if I didn't give it a value initially, is it possible to use the repeated character function later?

I tried doing this but it didn't work:

string example;
example(int, char);

I got this error "call of an object of a class type without appropriate operator() or conversion functions to pointer-to-function type"

Upvotes: 0

Views: 230

Answers (1)

mediocrevegetable1
mediocrevegetable1

Reputation: 4217

You can't do exactly that, but here's the next best thing. If you need to increase/decrease size, you can use std::string::resize(), which has a second parameter to fill the new chars. So try this:

std::string foo;
foo.resize(10, 'A');
std::cout << foo << '\n';

And the output will be: AAAAAAAAAA

However, note that if you try this:

std::string a = "a";
a.resize(2, 'A');

a will become "aA", because it does not overwrite the previous characters, only the new empty ones. To overwrite the previous ones, you can use std::fill:

std::string a = "aaa";
std::fill(a.begin(), a.end(), 'A');

And it'll become "AAA".

[EDIT] As @churill said, reusing the constructor a = std::string(10, 'A') will also set the value of the string to "AAAAAAAAAA", so you can use this as a simpler approach if you don't mind losing the previous value.

Upvotes: 1

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