CODEWITHSUNDEEP
c++stringcharstring-concatenation
Shazamo Morebucks
Shazamo Morebucks

Reputation: 50

How do I concatenate strings with chars in C++?

I've got a function which takes a string, let's call it 

void print(std::string myString) 
{ 
    std::cout << myString;
}

I want to do something like 

char myChar;
myChar = '{';
print("Error, unexpected char: " + myChar + "\n");

It doesn't work.

I tried something like 

print(std::string("Error, unexpected char") + std::string(myChar) + std::string("\n) )

but then std::string(myChar) becomes whatever int the char represents, it's printed as an int and isn't printed as it's alphanumeric representation!

Upvotes: 2

Views: 2516

Answers (3)

Vlad from Moscow
Vlad from Moscow

Reputation: 311088

The function should be declared like:

void print( const std::string &myString) 
{ 
    std::cout << myString;
}

and called like:

print( std::string( "Error, unexpected char: " ) + myChar + "\n");

As for your comment:

as a follow up, would it have been possible to pass an anonymous function returning a string as an argument to print()? Something like print( {return "hello world";}

then you can do this as it is shown in the demonstration program:

#include <iostream>
#include <string>

void f( std::string h() )
{
    std::cout << h() << '\n';
}

int main() 
{
    f( []()->std::string { return "Hello World!"; } );
    
    return 0;
}

Upvotes: 2

con ko
con ko

Reputation: 1416

If you are using C++14, you can do this:

using namespace std::literals;
char myChar;
myChar = '{';
print("Error, unexpected char: "s + myChar + "\n"s);

Upvotes: 2

Eklavya
Eklavya

Reputation: 18480

You can convert any one and concat.

You can use str.c_str() to convert C++ string to C character array.

Or

Use std::string inbuilt constructor to convert C character array to C++ string.

Upvotes: 1

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