C Questions and Answers – Variable Argument Lists

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Variable Argument Lists”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. How many macros are defined in the header file stdarg.h?
a) one
b) two
c) three
d) four
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2. The header file stdarg.h defines a variable type ________
a) va_list
b) v_list
c) size_t
d) var_list
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3. The three macros defined by stdarg.h is _________
a) start(), arg() and end()
b) var_start(), var_arg() and var_end()
c) va_start(), va_arg() and va_end()
d) v_start(), v_arg() and v_end()
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4. If access to the varying arguments is desired then the called function shall declare ________ having type va_list.
a) class
b) object
c) function
d) variable
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5. Which macro retrieves the next argument in the parameter list of the function with type type?
a) type va_arg(va_list ap, type)
b) type var_arg(va_list ap, type)
c) type v_arg(va_list ap, type)
d) type val_arg(va_list ap, type)
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6. The _______ macro shall be invoked before any access to the unnamed arguments.
a) va_arg
b) va_end
c) va_list
d) va_start
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7. ______ macro must be called before using ______ and ________
a) va_arg, va_end and va_start
b) va_start, va_end and va_arg
c) va_end, va_arg and va_start
d) v_arg, v_end and v_start
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8. The C library macro type _________ retrieves the next argument in the parameter list of the function with type.
a) va_end
b) va_arg
c) va_start
d) no macros
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9. What is the role of the given C function?

void va_end(va_list ap)

a) allows a function with variable arguments which used the va_start macro to return
b) retrieves the next argument in the parameter list
c) initializes ap variable to be used with the va_arg and va_start macros
d) returns the next additional argument as an expression
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10. Which header file should be included if a function has to be defined such that it can accept variable number of arguments?
a) stdlib.h
b) stdarg.h
c) assert.h
d) setjmp.h
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