Assemblers,compilers and interpreters

Assemblers,compilers and interpreters

1. Editors

   • USED TO EDIT SOURCE CODE
   • SOURCE CODE IS USUALLY A HIGH LEVEL LANGUAGE
     • HIGH-LEVEL LANGUAGE IS MORE SIMILAR TO HUMAN LANGUAGE THAN COMPUTER HARDWARE
   • SYNTAX HIGHLIGHTING
     • EDITORS UNDERSTAND DIFFERENT PROGRAMING CONSTRUCTS DEPENDING ON THE COLOUR OF THE CODE DEPENDING ON WHAT IT DOES.

2. COMPLIERS

   • TRANSLATE SOURCE CODE - HIGH LEVEL LANGUAGE- TO AN BINARY REPRESENTATION KNOWN AS OBJECT CODE
     • OBJECT CODE
       • CREATED FOR ONE TYPE OF CPU AND ARCHITECTURE
     • ADVANTAGE - CAN BE OPTIMISED TO RUN FOR A SPECIFIC PROCESSOR
     • DISADVANTAGE IS COMPILED CODE WILL ONLY RUN FOR ONE TYPE OF CPU OR OPERATING SYSTEM
   • c,c++,c# are all compiled languages
   • PROGRAMS USE OTHER LIBRARIES AND OBJECT CODE BY OTHER PROGRAMMERS. THESE COMBINED TOGETHER TO MAKE FINAL EXECUTABLE FILE BY USING PROGRAM CALLED A LINKER

3. INTERPERETER

   • TAKE SOURCE CODE AND TRANSLATE ONE LINE AT A TIME
     • THEN EXECUTE THAT LINE OF CODE
   • INTERPRETING TAKES LONGER THAN COMPILING
   • INTERPRETER TAKE MORE RAM - HAS TO BE LOADED INTO RAM THAN COMPILERS - IS SLOWER TO EXECUTE
   • EXAMPLES ARE PHP AND PYTHON
   • SAME CODE CAN BE RUN ON DIFFERENT OPERATING SYSTEMS

4. ASSEMBLERS

   • TAKE LOW LEVEL LANGUAGE - CALLED ASSEMBLY - AND TRANSLATE IT IS MACHINE CODE - BINARY.
   • ASSEMBLY CODE - THOUGH HARD TO READ - IT EASIER THAN MACHINE CODE TO READ
   • MADE UP OF MNEMONICS FOR EACH INSTRUCTION
   • EACH INSTRUCTION CORRESPONDS TO BIT PATTERN IN MACHINE CODE
   • WRITTEN FOR SPECIFIC CPU AND ARCHITECTURE
   • ASSEMBLY CODE ACCESS HARDWARE DIRECTLY. USE DEVICE DRIVERS AND OTHER LOW LEVEL PART OF OPERATING SYSTEM
   • CODE FOR GRAPHICS AND OPERATING SYSTEMS IN ASSEMBLY
     • VERY EFFICENT