public long FibonacciNumber(long n)
{
long fib = 0;
long temp = 1;
var count = n;
if (n < 0)
{
count = n * -1;
}
try
{
checked
{
for (var i = 0; i < count; i++)
{
fib = fib + temp;
temp = fib - temp;
}
}
}
catch (OverflowException ex)
{
var fault = new ArgumentOutOfRangeExceptionFault();
fault.FaultMessage = "Fib(>92) will cause a 64-bit integer overflow.";
throw new FaultException <ArgumentOutOfRangeExceptionFault>(fault, fault.FaultMessage);
}
if (n < 0)
{
if ((n * -1) % 2 != 0)
{
fib = fib * -1;
}
}
return(fib);
}
public long FibonacciNumber(long n)
{
long fib = 0;
long temp = 1;
var count = n;
if(n < 0)
{
count = n * -1;
}
try
{
checked
{
for (var i = 0; i < count; i++)
{
fib = fib + temp;
temp = fib - temp;
}
}
}
catch (OverflowException ex)
{
var fault = new ArgumentOutOfRangeExceptionFault();
fault.FaultMessage = "Fib(>92) will cause a 64-bit integer overflow.";
throw new FaultException<ArgumentOutOfRangeExceptionFault>(fault, fault.FaultMessage);
}
if (n < 0)
{
if ((n * -1) % 2 != 0)
{
fib = fib * -1;
}
}
return fib;
}
