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PROGRAM: MCA (REVISED FALL 2012)
SEMESTER: FIRST
SUBJECT CODE & NAME: MCA1020-
PROGRAMMING IN C
CREDIT: 4
BK ID: B1639
MAX. MARKS:
60
Q.1:
Define operators. Briefly explain about any four Operators in C.
ANS:
C supports a rich set
of operators. An operator is a symbol that tells the computer to perform
certain mathematical or logical manipulations. Operators are used in programs
to manipulate data and variables. They usually form a part of the mathematical
or logical expressions.
Q.2:
Differentiate between formal parameters and actual parameters with example
ANS:
Parameters (also
called formal parameters) or arguments are the special identifiers through whichinformation can be passed to the function. A function
has a body containingthe actual
instructions (statements) for carrying out the task the function issupposed to
perform; and it may give you back a
Q.3:
Describe about static and external variables.
ANS:
Static Variables
Static variables are
defined within individual functions and therefore have the same scope as
automatic variables, i.e. they are local to the functions in which they are
declared. Unlike automatic variables,
Q.4: Distinguish between
pass by value and pass by reference with the help of an example.
ANS:
Pass by value:
Pass by value may be
very inefficient if the structure is large (i.e., has many members). They have
identical declaration syntax and member access, but they serve a very different
purpose. Defining pointer types is the same as for variables of primitive
types.
Q.5:
Define macro. How we can declare a macro statement? Explain with an example.
ANS:
A preprocessor line of
the form
#define name text
Defines a macro with the given name, having as
its value the given replacement
text. After that (for the rest of the current source file), wherever the preprocessor
sees that name, it will replace it with the
Q.6:What is the use of fopen ()
and fclose () function? List and explain different modes for opening a file.
ANS:
fopen():
To open the file
input.dat for reading you might call
ifp
= fopen ("input.dat", "r");
The mode string
"r" indicates reading. Mode "w" indicates writing, so we could
open output.dat for output like this:
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