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// Experiment based on answer from 
// http://stackoverflow.com/questions/573294/when-to-use-reinterpret-cast
//                                                      by sfinktah bungholio
 
#include <iostream>
using namespace std;
 
int main() {
	// One use of reinterpret_cast is if you want to apply bitwise operations to 
	// (IEEE 754) floats. For instance:
 
	double d = 64;
 
	printf("d: %0.4d\n",
	reinterpret_cast<double&>((reinterpret_cast<int64_t&>(d) >> 1) + (1L << 61))
	);
}

prog.cpp: In function 'int main()':
prog.cpp:15:74: warning: left shift count >= width of type [-Wshift-count-overflow]
  reinterpret_cast<double&>((reinterpret_cast<int64_t&>(d) >> 1) + (1L << 61))
                                                                          ^
prog.cpp:15:77: error: invalid cast of an rvalue expression of type 'int64_t {aka long long int}' to type 'double&'
  reinterpret_cast<double&>((reinterpret_cast<int64_t&>(d) >> 1) + (1L << 61))
                                                                             ^

Standard output is empty