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Introduction to Compilers
Computers run 0/1 strings
(machine language program)
0010001000000100
A machine language program
0010010000000100 that adds two numbers
•First 4 bits for opcode
0001011001000010 •Last 12 bits for operands
0011011000000011 Source:
Louden and Lambert’s book:
1111000000100101 Programming Languages
0000000000000101
0000000000000110
0000000000000000
Programmers write more readable
character strings
An assembly language program that adds two numbers, from Louden and Lambert’s book.
Even more readable character strings:
high-level languages
Imperative Languages: specifies HOW
Fortran
ALGOL
PASCAL
C
C++
Java
Declarative Languages: specifies WHAT
SQL, ML, Prolog
Models of Computation in Languages
Underlying most programming languages is a model of
computation:
Procedural: Fortran (1957)
Functional: Lisp (1958)
Object oriented: Simula (1967)
Logic: Prolog (1972)
Relational algebra: SQL (1974)
Source: A. V. Aho. Lectures of Programming
Languages and Translators
What is a compiler?
A Compiler is a translator
between computers and programmers
More generally speaking, a Compiler is a
translator between source strings and t
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