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Can we use the currency signs like ₹ and $ while declaring variable in C++ language? I tried to find the answer on google but I was not clear about it.We can not use special symbols like #,*,% in variable names in c++ language but can we use currency signs like ₹ and $ as variable names?

康桓瑋
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MudassaRXaeed
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  • No, see [here](https://en.cppreference.com/w/cpp/language/identifiers) – Nimrod Dec 21 '21 at 08:44
  • [Yes](https://godbolt.org/z/f341KhY1q), but it requires compiler support, and it is not standard C++. – 康桓瑋 Dec 21 '21 at 08:49
  • Not in standard C++. That said, some compilers do provide non-standard extensions. But most compilers do not provide such extensions. – Peter Dec 21 '21 at 11:13

1 Answers1

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You sort of can if you use "user defined literals". https://en.cppreference.com/w/cpp/language/user_literal However not all compilers will be happy with the rupee special character (MSVC accepts it) Example here :

#include <iostream>

struct dollars_t
{
    double value;
};

struct rupees_t
{
    double value;
};

constexpr dollars_t operator "" _$(long double value)
{
    return dollars_t{ static_cast<double>(value) };
};

constexpr rupees_t operator "" _₹(long double value)
{
    return rupees_t{ static_cast<double>(value) };
};


int main()
{
    auto dollars = 10.12_$;
    auto rupees = 1000.12_₹;

    std::cout << "You have " << dollars.value << " dollars\n";
    std::cout << "And you have " << rupees.value << " rupees\n";

    return 0;
}
Pepijn Kramer
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