// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of the License "Eclipse Public License v1.0"

 // which accompanies this distribution, and is available

 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 // e32\euser\maths\um_rand.cpp

 // 

 //

 #include "um_std.h"

 EXPORT_C TInt Math::Rand(TInt64 &aSeed)

 /**

 Generates a stream of uniformly distributed pseudo-random integers

 in the range, 0 to KMaxTInt.

 For each stream of pseudo-random numbers you wish to generate, you should

 pass the reference to the same 64-bit seed on each call to this function.

 You should not change the seed between calls.

 @param aSeed A reference to a 64-bit seed, which is updated

              as a result of the call.

 @return The next pseudo-random number in the sequence. 

 */

 	{

 	aSeed*=214013;

     aSeed+=2531011;

     return(((TInt)(aSeed>>16))&0x7fffffff);

 	}

 EXPORT_C TReal Math::FRand(TInt64& aSeed) __SOFTFP

 /**

 Generates a stream of uniformly distributed pseudo-random real numbers

 in the range, 0 to 1.

 @param aSeed A reference to a 64-bit seed, which is updated

              as a result of the call.

 @return The next pseudo-random number in the sequence. 

 */

 	{

 	TUint low = (TUint)Math::Rand(aSeed);

 	TUint high = (TUint)Math::Rand(aSeed)&0x7FFFFFFF;	// make sure TInt64 is positive

 	TRealX f((static_cast<TInt64>(high) << 32) | low);	// construct TRealX 0<=f<2^63

 	if (f.iExp)

 		f.iExp-=63;						// Scale f to range 0<=f<1

     return(TReal(f));

 	}