حلول الفصل الاول

Practice Exercises
1.1 What arethethreemainpurposesofanoperatingsystem?
Answer: Thethreemainpuropsesare:
• Toprovideanenvironmentforacomputerusertoexecuteprograms
on computerhardwareinaconvenientandefficientmanner.
• Toallocatetheseparateresourcesofthecomputerasneededto
solve theproblemgiven.Theallocationprocessshouldbeasfair
andefficientaspossible.
• As acontrolprogramitservestwomajorfunctions:(1)supervision
of theexecutionofuserprogramstopreventerrorsandimproperuse
of thecomputer,and(2)managementoftheoperationandcontrol
of I/O devices.
1.2 What arethemaindifferencesbetweenoperatingsystemsformainframe
Practice Exercises
1.1 What arethethreemainpurposesofanoperatingsystem?
Answer: Thethreemainpuropsesare:
• Toprovideanenvironmentforacomputerusertoexecuteprograms
on computerhardwareinaconvenientandefficientmanner.
• Toallocatetheseparateresourcesofthecomputerasneededto
solve theproblemgiven.Theallocationprocessshouldbeasfair
andefficientaspossible.
• As acontrolprogramitservestwomajorfunctions:(1)supervision
of theexecutionofuserprogramstopreventerrorsandimproperuse
of thecomputer,and(2)managementoftheoperationandcontrol
of I/O devices.
1.2 What arethemaindifferencesbetweenoperatingsystemsformainframe