diff --git a/1.1 Hello World.cpp b/01.1 Hello World.cpp similarity index 100% rename from 1.1 Hello World.cpp rename to 01.1 Hello World.cpp diff --git a/1.Ex1 BasicMaths.cpp b/01.Ex1 BasicMaths.cpp similarity index 100% rename from 1.Ex1 BasicMaths.cpp rename to 01.Ex1 BasicMaths.cpp diff --git a/1.Ex4 BugFree Ex3.cpp b/01.Ex4 BugFree Ex3.cpp similarity index 100% rename from 1.Ex4 BugFree Ex3.cpp rename to 01.Ex4 BugFree Ex3.cpp diff --git a/2.1 HelloWorldAnalysis.cpp b/02.1 HelloWorldAnalysis.cpp similarity index 100% rename from 2.1 HelloWorldAnalysis.cpp rename to 02.1 HelloWorldAnalysis.cpp diff --git a/2.2 UsingNamespaceDecl.cpp b/02.2 UsingNamespaceDecl.cpp similarity index 100% rename from 2.2 UsingNamespaceDecl.cpp rename to 02.2 UsingNamespaceDecl.cpp diff --git a/2.3 UsingRestricted.cpp b/02.3 UsingRestricted.cpp similarity index 100% rename from 2.3 UsingRestricted.cpp rename to 02.3 UsingRestricted.cpp diff --git a/2.4 FirstFunction_Demo_cout.cpp b/02.4 FirstFunction_Demo_cout.cpp similarity index 100% rename from 2.4 FirstFunction_Demo_cout.cpp rename to 02.4 FirstFunction_Demo_cout.cpp diff --git a/2.5 FunctionValueReturnedFromMain.cpp b/02.5 FunctionValueReturnedFromMain.cpp similarity index 100% rename from 2.5 FunctionValueReturnedFromMain.cpp rename to 02.5 FunctionValueReturnedFromMain.cpp diff --git a/2.6 Anatomy_BasicIO.cpp b/02.6 Anatomy_BasicIO.cpp similarity index 100% rename from 2.6 Anatomy_BasicIO.cpp rename to 02.6 Anatomy_BasicIO.cpp diff --git a/2.Ex2.cpp b/02.Ex2.cpp similarity index 100% rename from 2.Ex2.cpp rename to 02.Ex2.cpp diff --git a/2.Ex3.cpp b/02.Ex3.cpp similarity index 100% rename from 2.Ex3.cpp rename to 02.Ex3.cpp diff --git a/3.1 VariablesDemo_MultiplyTwoNumbers.cpp b/03.1 VariablesDemo_MultiplyTwoNumbers.cpp similarity index 100% rename from 3.1 VariablesDemo_MultiplyTwoNumbers.cpp rename to 03.1 VariablesDemo_MultiplyTwoNumbers.cpp diff --git a/3.2 VariablesScopeDemo.cpp b/03.2 VariablesScopeDemo.cpp similarity index 100% rename from 3.2 VariablesScopeDemo.cpp rename to 03.2 VariablesScopeDemo.cpp diff --git a/3.3 GlobalVariablesDemo.cpp b/03.3 GlobalVariablesDemo.cpp similarity index 100% rename from 3.3 GlobalVariablesDemo.cpp rename to 03.3 GlobalVariablesDemo.cpp diff --git a/3.4 Operators_Signed_Unsigned_Overflow.cpp b/03.4 Operators_Signed_Unsigned_Overflow.cpp similarity index 100% rename from 3.4 Operators_Signed_Unsigned_Overflow.cpp rename to 03.4 Operators_Signed_Unsigned_Overflow.cpp diff --git a/3.5 Using_sizeof.cpp b/03.5 Using_sizeof.cpp similarity index 100% rename from 3.5 Using_sizeof.cpp rename to 03.5 Using_sizeof.cpp diff --git a/3.6 UsingAuto.cpp b/03.6 UsingAuto.cpp similarity index 100% rename from 3.6 UsingAuto.cpp rename to 03.6 UsingAuto.cpp diff --git a/3.7 Demo_Constants.cpp b/03.7 Demo_Constants.cpp similarity index 100% rename from 3.7 Demo_Constants.cpp rename to 03.7 Demo_Constants.cpp diff --git a/3.8 using constexpr.cpp 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Check_ArithmeticOperators.cpp similarity index 100% rename from 5.1 Check_ArithmeticOperators.cpp rename to 05.1 Check_ArithmeticOperators.cpp diff --git a/5.10 Operators_CompoundOperators.cpp b/05.10 Operators_CompoundOperators.cpp similarity index 100% rename from 5.10 Operators_CompoundOperators.cpp rename to 05.10 Operators_CompoundOperators.cpp diff --git a/5.11 Operator_sizeof.cpp b/05.11 Operator_sizeof.cpp similarity index 100% rename from 5.11 Operator_sizeof.cpp rename to 05.11 Operator_sizeof.cpp diff --git a/5.2 Operators_PostFix_Prefix.cpp b/05.2 Operators_PostFix_Prefix.cpp similarity index 100% rename from 5.2 Operators_PostFix_Prefix.cpp rename to 05.2 Operators_PostFix_Prefix.cpp diff --git a/5.3 Operators_Relational_Equality.cpp b/05.3 Operators_Relational_Equality.cpp similarity index 100% rename from 5.3 Operators_Relational_Equality.cpp rename to 05.3 Operators_Relational_Equality.cpp diff --git a/5.4 ThreeWayComparisonOp.cpp b/05.4 ThreeWayComparisonOp.cpp 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Operators_BitwiseShift.cpp diff --git a/5.Ex3.cpp b/05.Ex3.cpp similarity index 100% rename from 5.Ex3.cpp rename to 05.Ex3.cpp diff --git a/5.Quiz5.cpp b/05.Quiz5.cpp similarity index 100% rename from 5.Quiz5.cpp rename to 05.Quiz5.cpp diff --git a/6.1 Multiply_or_Add_if_else.cpp b/06.1 Multiply_or_Add_if_else.cpp similarity index 100% rename from 6.1 Multiply_or_Add_if_else.cpp rename to 06.1 Multiply_or_Add_if_else.cpp diff --git a/6.10 EnterValuesInAnArray_DisplayArray_for_loop.cpp b/06.10 EnterValuesInAnArray_DisplayArray_for_loop.cpp similarity index 100% rename from 6.10 EnterValuesInAnArray_DisplayArray_for_loop.cpp rename to 06.10 EnterValuesInAnArray_DisplayArray_for_loop.cpp diff --git a/6.11 MultiplyAdd_for_loop.cpp b/06.11 MultiplyAdd_for_loop.cpp similarity index 100% rename from 6.11 MultiplyAdd_for_loop.cpp rename to 06.11 MultiplyAdd_for_loop.cpp diff --git a/6.12 RangeBasedFor.cpp b/06.12 RangeBasedFor.cpp similarity index 100% rename from 6.12 RangeBasedFor.cpp 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checkbounds.cpp similarity index 100% rename from 6.2 checkbounds.cpp rename to 06.2 checkbounds.cpp diff --git a/6.3 Nested_if_check_Divisor.cpp b/06.3 Nested_if_check_Divisor.cpp similarity index 100% rename from 6.3 Nested_if_check_Divisor.cpp rename to 06.3 Nested_if_check_Divisor.cpp diff --git a/6.4 WhatDaysOfWeekMean_if_else.cpp b/06.4 WhatDaysOfWeekMean_if_else.cpp similarity index 100% rename from 6.4 WhatDaysOfWeekMean_if_else.cpp rename to 06.4 WhatDaysOfWeekMean_if_else.cpp diff --git a/6.5 DaysOfWeek_switch_case.cpp b/06.5 DaysOfWeek_switch_case.cpp similarity index 100% rename from 6.5 DaysOfWeek_switch_case.cpp rename to 06.5 DaysOfWeek_switch_case.cpp diff --git a/6.6 ConditionalOperator_TernaryOperator.cpp b/06.6 ConditionalOperator_TernaryOperator.cpp similarity index 100% rename from 6.6 ConditionalOperator_TernaryOperator.cpp rename to 06.6 ConditionalOperator_TernaryOperator.cpp diff --git a/6.7 MultiplyOrAdd_goto.cpp b/06.7 MultiplyOrAdd_goto.cpp similarity index 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Functions_ComputingAreaCircumference.cpp rename to 07.1 Functions_ComputingAreaCircumference.cpp diff --git a/7.10 Functions_Inline.cpp b/07.10 Functions_Inline.cpp similarity index 100% rename from 7.10 Functions_Inline.cpp rename to 07.10 Functions_Inline.cpp diff --git a/7.11 auto function return.cpp b/07.11 auto function return.cpp similarity index 100% rename from 7.11 auto function return.cpp rename to 07.11 auto function return.cpp diff --git a/7.12 Functions_Lambda.cpp b/07.12 Functions_Lambda.cpp similarity index 100% rename from 7.12 Functions_Lambda.cpp rename to 07.12 Functions_Lambda.cpp diff --git a/7.2 Functions_MultipleParameters_Cylinder.cpp b/07.2 Functions_MultipleParameters_Cylinder.cpp similarity index 100% rename from 7.2 Functions_MultipleParameters_Cylinder.cpp rename to 07.2 Functions_MultipleParameters_Cylinder.cpp diff --git a/7.3 Functions_SayingHelloWithoutParamsReturnValue.cpp b/07.3 Functions_SayingHelloWithoutParamsReturnValue.cpp similarity index 100% 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Pointers_new_exceptionhandler.cpp similarity index 100% rename from 8.15 Pointers_new_exceptionhandler.cpp rename to 08.15 Pointers_new_exceptionhandler.cpp diff --git a/8.16 Pointers_new_nothrow.cpp b/08.16 Pointers_new_nothrow.cpp similarity index 100% rename from 8.16 Pointers_new_nothrow.cpp rename to 08.16 Pointers_new_nothrow.cpp diff --git a/8.17 References_Declaring_Initializing.cpp b/08.17 References_Declaring_Initializing.cpp similarity index 100% rename from 8.17 References_Declaring_Initializing.cpp rename to 08.17 References_Declaring_Initializing.cpp diff --git a/8.18 References_PassingArgsToFunctions.cpp b/08.18 References_PassingArgsToFunctions.cpp similarity index 100% rename from 8.18 References_PassingArgsToFunctions.cpp rename to 08.18 References_PassingArgsToFunctions.cpp diff --git a/8.19 References_Const.cpp b/08.19 References_Const.cpp similarity index 100% rename from 8.19 References_Const.cpp rename to 08.19 References_Const.cpp diff --git a/8.2 Pointers_AssigningRefToPtr.cpp b/08.2 Pointers_AssigningRefToPtr.cpp similarity index 100% rename from 8.2 Pointers_AssigningRefToPtr.cpp rename to 08.2 Pointers_AssigningRefToPtr.cpp diff --git a/8.3 Pointers_OnePtrManyIntegers.cpp b/08.3 Pointers_OnePtrManyIntegers.cpp similarity index 100% rename from 8.3 Pointers_OnePtrManyIntegers.cpp rename to 08.3 Pointers_OnePtrManyIntegers.cpp diff --git a/8.4 Pointers_Dereferencing_or_IndirectionOperator.cpp b/08.4 Pointers_Dereferencing_or_IndirectionOperator.cpp similarity index 100% rename from 8.4 Pointers_Dereferencing_or_IndirectionOperator.cpp rename to 08.4 Pointers_Dereferencing_or_IndirectionOperator.cpp diff --git a/8.5 Pointers_AssigningUsingDerefOp.cpp b/08.5 Pointers_AssigningUsingDerefOp.cpp similarity index 100% rename from 8.5 Pointers_AssigningUsingDerefOp.cpp rename to 08.5 Pointers_AssigningUsingDerefOp.cpp diff --git a/8.6 Pointers_sizeof_Test.cpp b/08.6 Pointers_sizeof_Test.cpp similarity index 100% rename from 8.6 Pointers_sizeof_Test.cpp rename to 08.6 Pointers_sizeof_Test.cpp diff --git a/8.7 Pointers_Using_new_delete.cpp b/08.7 Pointers_Using_new_delete.cpp similarity index 100% rename from 8.7 Pointers_Using_new_delete.cpp rename to 08.7 Pointers_Using_new_delete.cpp diff --git a/8.8 Pointers_Using_new_delete_char_array.cpp b/08.8 Pointers_Using_new_delete_char_array.cpp similarity index 100% rename from 8.8 Pointers_Using_new_delete_char_array.cpp rename to 08.8 Pointers_Using_new_delete_char_array.cpp diff --git a/8.9 Pointer_using_new_delete_multiple_elements.cpp b/08.9 Pointer_using_new_delete_multiple_elements.cpp similarity index 100% rename from 8.9 Pointer_using_new_delete_multiple_elements.cpp rename to 08.9 Pointer_using_new_delete_multiple_elements.cpp diff --git a/9.1 ClassHuman.cpp b/09.1 ClassHuman.cpp similarity index 100% rename from 9.1 ClassHuman.cpp rename to 09.1 ClassHuman.cpp diff --git a/9.10 Singleton.cpp b/09.10 Singleton.cpp similarity index 100% rename from 9.10 Singleton.cpp rename to 09.10 Singleton.cpp diff --git a/9.11 MonsterDB_ForceConstructionOnFreeStore.cpp b/09.11 MonsterDB_ForceConstructionOnFreeStore.cpp similarity index 100% rename from 9.11 MonsterDB_ForceConstructionOnFreeStore.cpp rename to 09.11 MonsterDB_ForceConstructionOnFreeStore.cpp diff --git a/9.12 explicit constructors.cpp b/09.12 explicit constructors.cpp similarity index 100% rename from 9.12 explicit constructors.cpp rename to 09.12 explicit constructors.cpp diff --git a/9.13 SizeOfClass.cpp b/09.13 SizeOfClass.cpp similarity index 100% rename from 9.13 SizeOfClass.cpp rename to 09.13 SizeOfClass.cpp diff --git a/9.14 FriendFunctions.cpp b/09.14 FriendFunctions.cpp similarity index 100% rename from 9.14 FriendFunctions.cpp rename to 09.14 FriendFunctions.cpp diff --git a/9.15 FriendClass.cpp b/09.15 FriendClass.cpp similarity index 100% rename from 9.15 FriendClass.cpp rename to 09.15 FriendClass.cpp diff --git a/9.16 UsingUnions.cpp b/09.16 UsingUnions.cpp 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