A union type demonstrating an int and a float occupying the same memory location

union.cc

#include<iostream>
#include<sstream>

int main(int argc, char** argv){
    union mytypes_t {
        int i;
        float f;
    } mytypes;
    int in_i = 5;
    float in_f = 5.0;
    std::stringstream in;

    if(argc > 1){
        in << argv[1];
        in >> in_i;
        in.str("");
        in.clear();
    }
    else{
        in_i = 5;
    }

    mytypes.i = in_i;
    std::cout
        << "mytypes.i = "
        << mytypes.i
        << " (0x"
        << std::hex
        << mytypes.i
        << std::dec
        << ")"
        << std::endl;
    std::cout << "mytypes.f: " << mytypes.f << std::endl;

    if(argc > 2){
        in << argv[2];
        in >> in_f;
        in.str("");
        in.clear();
    }
    else{
        in_f = 5.0;
    }

    mytypes.f = in_f;
    std::cout << "mytypes.f = " << mytypes.f << std::endl;
    std::cout
        << "mytypes.i: "
        << mytypes.i
        << " (0x"
        << std::hex
        << mytypes.i
        << ")"
        << std::endl;

    return 0;
}