Concepts of Programming Languages Chapter 5
Name : Erland
NIM : 1601218035
Lecturer : Tri Djoko Wahjono, Ir., M.Sc. (D0206)
Assignment : Concept of programming languages Chapter 5
Review Questions
1. what are the design issues for names?
Answer : - Are names case sensitive ?
- Are the special words of the language reserved
words or keywords ?
- Are the special words of the language reserved
words or keywords ?
2. What is the potential danger of case-sensitive name?
Answer : Because case-sensitive violates the design principle that language
constructs that look similar should have similar meanings.
constructs that look similar should have similar meanings.
3. In what way are reserved words better than keywords?
Answer : As a language design choice, reserved words are better than
keywords because the ability to redefine keywords can be confusing.
keywords because the ability to redefine keywords can be confusing.
4. what is alias?
Answer : Alias is more than variable with the same name that
can be used to access the same memory location.
can be used to access the same memory location.
5. Which category of C++ reference variables is always aliases?
Answer : One common way in C and C++ is with their union types.
6. What is the l-value of a variable? What is the r-value?
Answer:The address of a variable is sometimes called l-value, and
a variable's value is sometimes called r-value.
Answer:The address of a variable is sometimes called l-value, and
a variable's value is sometimes called r-value.
7. Define binding and binding time.
Answer : - Binding is an association between an attribute and an entity,
such as between a variable and its type or value, or between
an operation and a symbol.
- The time at which a binding takes place is called binding time.
such as between a variable and its type or value, or between
an operation and a symbol.
- The time at which a binding takes place is called binding time.
9. Define static binding and dynamic binding?
Answer : Static binding is done at compile time when a function is
called in order to match it with the definition, while
Dynamic binding is at run time where we can specify
that the compiler matches a function call with the correct
function definition at run time.
called in order to match it with the definition, while
Dynamic binding is at run time where we can specify
that the compiler matches a function call with the correct
function definition at run time.
Problem Sets
ex: printf("%d\n",*num++);
1. Decide which of the following identifier names is valid in c language, support
your decision.
your decision.
Answer: - _student : valid, because in C name can be started with an underline.
- int : invalid, because int is a reserved data type for integer.
- Student : valid, because in C uppercase is allowed.
- 123Student : invalid, because in C names can't be started with number.
- Student123 : valid, as long as the names not started with number it
is allowed.
- int : invalid, because int is a reserved data type for integer.
- Student : valid, because in C uppercase is allowed.
- 123Student : invalid, because in C names can't be started with number.
- Student123 : valid, as long as the names not started with number it
is allowed.
2. What is the l-value? write a statement in C language which gives the compile
error "l-value required".
Answer: l-value is the address of a variable.error "l-value required".
ex: printf("%d\n",*num++);
4. Why is the type declaration of a variable necessary? What is the value range
of the int type variable in Java?
of the int type variable in Java?
Answer : Because the program have to know what data type of a variable and
the value of the variable. The value range of the int type variable in
Java is around -2147483648 to 2147483647.
the value of the variable. The value range of the int type variable in
Java is around -2147483648 to 2147483647.
