© Thomas Kunz 2000
SCE 574
112
High Level Languages
äAssembly language
programming
äToo time consuming
and error prone
äTarget dependent,
not portable
äHigh level
languages
äTarget
independent
äMore convenient way
to express algorithms
äExamples: COBOL,
FORTRAN
äBetter control mechanisms than assembler: loops,
if-then-else etc., array and matrix manipulation
äMore readable,
people could write billions of lines of code!
äLimited support for
data structures
äStructures or
records
ä C, Pascal
äMore support for data structures, user defined types,
but do not fully enforce type checking
äExplicit support for
pointers in both languages
äC uses symbol * to indicate a variable holds
a pointer
äint * variable
äPascal introduces a
symbol ^ for pointers
ävariable :
^integer
ävariable is a
pointer to another variable of type integer
