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Visual Studio Code – Unexpected Output When Using /n in C++: Why Does It Print 12142?

I encountered a strange issue while working on a C++ program with VisusalStuidio 2021. When I used cout << ‘/n’;, I expected it to simply print /n or values in ASCII(47110), but instead, it printed 12142. This behavior is confusing and I couldn’t find a clear explanation for it.

I’ve tried to go googling but the only answers are very sketchy, so I’d appreciate a detailed answer, thanks!Hope someone can help me。

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2

Answers


  1. 0

    you are seeing multicharacter constant, look in character_constant and search for multicharacter constant.

    1. multicharacter constant, e.g. ‘AB’, has type int and implementation-defined value.

    you are just seeing the concatenation of the bytes of both / and n converted to an int, you can print them in hex to see their hex representation is equivalent.

    #include <iostream>

int main()
{
    std::cout << '/n' << std::endl;
    std::cout << std::hex << '/n' << std::endl;
    std::cout << std::hex << static_cast<int>('/') 
      << std::hex << static_cast<int>('n') << std::endl;
}

    12142
2f6e
2f6e
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  2. 0

    Just use the double quotes:

    #include <iostream>

using namespace std;

int main() {
   cout<<"/n";

    return 0;
}

    For anyone wondering why the value is 12142, the likely answer is that in the OP’s implementation, ‘/’ has the integral value 47, ‘n’ has the integral value 110, and these are "concatenated" into an int a la <47><110> (leaving endianness out of the picture), giving a value of 47*2^8 + 110 = 12142

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