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CMSC131 
Lab slides 
Tak
Sep 8th 
Hardware and 
Software
Different hardwares, Same software
http://en.wikibooks.org/wiki/A-level_ 
Computing/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Int 
ernet/Fundamentals_of_Computer_Systems/Hardware_and_software
Software layers
Software layers
CPU 
Memory 
Main 
Secondary 
I / O 
Network 
1 
2 
3 
4 5 
6
QUESTION! 
How many numbers can we 
count with ten fingers? 
Each finger has two states: (folded or not)
ASCII (American Standard Code for 
Information Interchange)
Program Language Generatinos 
1st. Machine Code
Program Language Generatinos 
2nd Assembly
Program Language Generatinos 
3rd Fortran, COBOL, C, C++, Java
Program Language Generatinos 
4th Application / Domain-specific 
languages (SPSS, SQL, Mathematica) 
SQL 
Mathematica
Program Language Generatinos 
5th Constraint / Logic programming 
(e.g. Prolog, Haskell, ML, ...)
C machine code
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Lab slides - hardware and software

Editor's Notes

  1. The interpreter takes one statement then translates it and executes it and then takes another statement. While the compiler translates the entire program in one go and then executes it. · Compiler generates the error report after the translation of the entire page while an interpreter will stop the translation after it gets the first error. · Compiler takes a larger amount of time in analyzing and processing the high level language code comparatively interpreter takes lesser time in the same process. · Besides the processing and analyzing time the overall execution time of a code is faster for compiler relative to the interpreter.