Checking for equality with QPU (no data loss)

// Programming Quantum Computers
//   by Eric Johnston, Nic Harrigan and Mercedes Gimeno-Segovia
//   O'Reilly Media

// To run this online, go to http://oreilly-qc.github.io?p=3-4


//Edits for clarity made by N. Halstead

qc.clearOutput();
var results = "";
for(var i=0; i < 50; i++){
qc.reset(3);
var input1 = qint.new(1, 'input1');
var input2 = qint.new(1, 'input2');
var output = qint.new(1, 'output');
// Initialize the output register
// Initialize input registers that we want to compare
// In this example the swap test should reveal their equality
qc.label('Initialize');
input1.write(1);
input2.write(0);
qc.label('');
qc.nop()

// The swap test itself
qc.label('Swap test')
output.write(0);
output.had();
// Now exchange the two inputs conditional on the output qubits.
input1.exchange(input2, 0x1, output.bits());
output.had();
output.not();
// The output register is 1 only if inputs are equal
var ans = output.read();
results+=ans;
qc.label('');
qc.nop();
}

//check results
qc.print(results+"\n");
var different = false;
for(var i = 0; i < results.length-1; i++){
    if(results.charAt(i)!==results.charAt(i+1)){
        different = true;
    }
}

different ? qc.print("The inputs don't match!") : qc.print("The inputs match");