Question

How to detect if a 32-bit or 64-bit architecture in C++

Answer 1

#include <iostream>

int main() {
    if constexpr(sizeof(nullptr) == 8) {
        std::cout << "64-bit\n";
    } else {
        std::cout << "32-bit\n";
    }
}


/*
run:

64-bit

*/

 

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Answer 2

#include <iostream>

int main() {
    #ifdef __x86_64
        std::cout << "64-bit\n";
    #else
        #ifdef _M_AMD64
            std::cout << "64-bit\n";
        #else
            std::cout << "32-bit\n";
        #endif
    #endif
}


/*
run:

64-bit

*/

 

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