Chapter 1.1, Problem 11STE

Program Plan Intro

Computer Systems:

• A computer denotes a machine or device that would accomplish processes, computations as well as operations centered on instructions provided by software.
• A computer follows an instruction set that is termed as a program.
• The collection of programs used by computer is termed as software.
• The computer installation is made up by physical machines termed as hardware.

Linking:

• Linking denotes a process that combines all component object files.
• Linker determines position of code in memory.
  • It denotes method to control transfer between components.
• It takes one or more object files created by compiler and combine them into single executable file.
• The resolution of undefined symbols is deferred until a program is run and it’s termed as dynamic linking.
  • The libraries that are often-used required to be stored in single location.
  • It is not duplicated in all single executable files.
  • If a bug in a function is been corrected by replacing library, all of the programs will benefit from this linking.
• A static linking denotes copying of all routines used in program into executable image by linker.
  • It requires more space and memory than dynamic linking.
  • It denotes more portability.
  • Each program includes exactly required versions of its library routines.
  • The entire library may not be required in many cases.
• A linkage editor allows replacement, addition and deletion of sections of individual programs.