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29 Cards in this Set
- Front
- Back
- 3rd side (hint)
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data type |
defines a collection of data values and a set of predefined operations on those values |
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descriptor |
collection of the attributes of a variable |
in implementation it is an area of memory that stores attributes of a variable |
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what are the four memory pools |
Static/global stack/dynamic explicit heap dynamic implicit heap dynamic |
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What is the lifetime for variables stored in the static/global memory pool? |
the length of the program |
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what are the five parameter passing techniques discussed in class |
by reference by value by name by result by value/result |
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how does passing by reference work? |
Pass the memory location to a function as a parameter so the actual value of thevariable pointing to that memory location can be modified |
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how does passing by value work? |
input type of passing; supply a value by making a copying the value of a variable, nochanges are made to the original variable. |
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how does passing by name work? |
Name: function code replaces an argument name with predetermined text |
macros (#define) |
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how does passing by result work? |
A function is supplied a variable it can copy data into |
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how does passing by value result work |
computation done is done in a function and the new value gets copied back out |
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what are the three types of subprogram abstraction? |
data control procedural |
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widening conversion |
no issues with int to float |
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narrowing conversion |
issues with int to float |
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What are two ways to deal with dangling pointers |
tombstones and lock & key |
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how does tomb stone work? |
after deallocation it sets the tombstone pointer to null |
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how does lock and key work? |
set keys to a special illegal value upon deallocation |
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what are the two type conversions |
explicit and implicit |
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what are two type compatability |
arguments -> parameters operators and operands |
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how do you do explicit conversions? |
through casting |
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how do you do implicit conversions |
through coercion |
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what is a scalar type |
values that can be ordered |
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what is an ordinal type |
values that have one unique predecessor and successor |
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what is aliasing |
when two variables reference the same address |
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What is binding |
the association between attribute and entity |
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what is binding time |
when the association between attribute and an entity take place |
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what is a variables scope |
the range of statements in which a variable can be referenced |
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what is lifetime |
how long a variable exists in memory |
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activation record contains |
Local Variables Parameter Values Dynamic Link Return Address |
Function calls within functions |
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Dynamic Link |
Base of Activation Record of calling routine. |
Where does it start? |
