Explore topic-wise MCQs in C Programming.

This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

is an array that holds information needed by and

A. True
B. False
Answer» B. False
Discussion
2.

The macro is used to initialise a pointer to the beginning of the list of fixed arguments.

A. True
B. False
Answer» C.
Discussion
3.

The macro is used to extract an argument from the fixed micro argument list and advance the pointer to the next argument.

A. Yes
B. No
Answer» C.
Discussion
4.

It is necessary to call the macro if is called in the function.

A. Yes
B. No
Answer» B. No
Discussion
5.

The macro is used to extract an argument from the variable argument list and advance the pointer to the next argument.

A. True
B. False
Answer» B. False
Discussion
6.

A function that receives variable number of arguments should use to extract arguments from the variable argument list.

A. True
B. False
Answer» B. False
Discussion
7.

A function that receives variable number of arguments should use to extract the last argument from the variable argument list.

A. True
B. False
Answer» C.
Discussion
8.

Point out the error in the following program._x000D_ #include_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ void display(int num, ...);_x000D_ display(4, 12.5, 13.5, 14.5, 44.3);_x000D_ return 0;_x000D_ }_x000D_ void display(int num, ...)_x000D_ {_x000D_ float c; int j;_x000D_ va_list ptr;_x000D_ va_start(ptr, num);_x000D_ for(j=1; j

A. Error: invalid va_list declaration
B. Error: var c data type mismatch
C. No error
D. No error and Nothing will print
Answer» C. No error
Discussion
9.

Which header file should you include, if you are going to develop a function, which can accept variable number of arguments?

A. varagrg.h
B. stdlib.h
C. stdio.h
D. stdarg.h
Answer» E.
Discussion
10.

The macro va_arg is used to extract an argument from the fixed micro argument list and advance the pointer to the next argument.

A. Yes
B. No
Answer» C.
Discussion
11.

Point out the error in the following program. #include #include void varfun(int n, ...); int main() { varfun(3, 7, -11.2, 0.66); return 0; } void varfun(int n, ...) { float *ptr; int num; va_start(ptr, n); num = va_arg(ptr, int); printf("%d", num); }

A. Error: too many parameters
B. Error: invalid access to list member
C. Error: ptr must be type of va_list
D. No error
Answer» D. No error
Discussion
12.

The macro va_start is used to initialise a pointer to the beginning of the list of fixed arguments.

A. 1
B.
Answer» C.
Discussion
13.

It is necessary to call the macro va_end if va_start is called in the function.

A. Yes
B. No
C. Yes
D. No
Answer» B. No
Discussion
14.

A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

A. 1
B.
Answer» C.
Discussion
15.

Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

A. Yes
B. No
Answer» B. No
Discussion
16.

A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

A. 1
B.
Answer» B.
Discussion
17.

Point out the error if any in the following program (Turbo C). #include #include void display(int num, ...); int main() { display(4, 'A', 'a', 'b', 'c'); return 0; } void display(int num, ...) { char c; int j; va_list ptr; va_start(ptr, num); for(j=1; j

A. Error: unknown variable ptr
B. Error: Lvalue required for parameter
C. No error and print A a b c
D. No error and print 4 A a b c
Answer» D. No error and print 4 A a b c
Discussion
18.

Point out the error in the following program. #include #include void display(char *s, ...); void show(char *t, ...); int main() { display("Hello", 4, 12, 13, 14, 44); return 0; } void display(char *s, ...) { show(s, ...); } void show(char *t, ...) { int a; va_list ptr; va_start(ptr, s); a = va_arg(ptr, int); printf("%f", a); }

A. Error: invalid function display() call
B. Error: invalid function show() call
C. No error
D. Error: Rvalue required for t
Answer» C. No error
Discussion
19.

va_list is an array that holds information needed by va_arg and va_end

A. 1
B.
C. 1
D.
Answer» B.
Discussion
20.

Point out the error in the following program. #include #include int main() { void display(int num, ...); display(4, 12.5, 13.5, 14.5, 44.3); return 0; } void display(int num, ...) { float c; int j; va_list ptr; va_start(ptr, num); for(j=1; j

A. Error: invalid va_list declaration
B. Error: var c data type mismatch
C. No error
D. No error and Nothing will print
Answer» C. No error
Discussion
21.

For a function receives variable number of arguments it is necessary that the function should receive at least one fixed argument.

A. 1
B.
Answer» B.
Discussion
22.

Can we write a function that takes a variable argument list and passes the list to another function?

A. Yes
B. No
Answer» B. No
Discussion
23.

Point out the error in the following program. #include #include void varfun(int n, ...); int main() { varfun(3, 7, -11, 0); return 0; } void varfun(int n, ...) { va_list ptr; int num; num = va_arg(ptr, int); printf("%d", num); }

A. Error: ptr has to be set at begining
B. Error: ptr must be type of va_list
C. Error: invalid access to list member
D. No error
Answer» B. Error: ptr must be type of va_list
Discussion
24.

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

A. 1
B.
Answer» C.
Discussion
25.

While defining a variable argument list function we drop the ellipsis(...)?

A. Yes
B. No
Answer» B. No
Discussion
26.

Point out the error in the following program. #include #include int main() { void display(char *s, int num1, int num2, ...); display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0); return 0; } void display(char *s, int num1, int num2, ...) { double c; char s; va_list ptr; va_start(ptr, s); c = va_arg(ptr, double); printf("%f", c); }

A. Error: invalid arguments in function display()
B. Error: too many parameters
C. Error: in va_start(ptr, s);
D. No error
Answer» D. No error
Discussion
27.

Can the fixed arguments passed to the function that accepts variable argument list, occur at the end?

A. Yes
B. No
Answer» C.
Discussion
28.

What will be the output of the program? #include #include void fun1(char, int, int *, float *, char *); void fun2(char ch, ...); void (*p1)(char, int, int *, float *, char *); void (*p2)(char ch, ...); int main() { char ch='A'; int i=10; float f=3.14; char *p="Hello"; p1=fun1; p2=fun2; (*p1)(ch, i, &i, &f, p); (*p2)(ch, i, &i, &f, p); return 0; } void fun1(char ch, int i, int *pi, float *pf, char *p) { printf("%c %d %d %f %s \n", ch, i, *pi, *pf, p); } void fun2(char ch, ...) { int i, *pi; float *pf; char *p; va_list list; printf("%c ", ch); va_start(list, ch); i = va_arg(list, int); printf("%d ", i); pi = va_arg(list, int*); printf("%d ", *pi); pf = va_arg(list, float*); printf("%f ", *pf); p = va_arg(list, char *); printf("%s", p); }

A. A 10 3.14 A 10 3.14
B. A 10 10 3.140000 Hello A 10 10 3.140000 Hello
C. A 10 Hello A 10 Hello
D. Error
Answer» C. A 10 Hello A 10 Hello
Discussion
29.

Can we pass a variable argument list to a function at run-time?

A. Yes
B. No
C. Yes
D. No
Answer» C. Yes
Discussion
30.

Point out the error in the following program. #include #include fun(...); int main() { fun(3, 7, -11.2, 0.66); return 0; } fun(...) { va_list ptr; int num; va_start(ptr, n); num = va_arg(ptr, int); printf("%d", num); }

A. Error: fun() needs return type
B. Error: ptr Lvalue required
C. Error: Invalid declaration of fun(...)
D. No error
Answer» D. No error
Discussion
31.

The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
32.

What will be the output of the program? #include #include void fun1(int num, ...); void fun2(int num, ...); int main() { fun1(1, "Apple", "Boys", "Cats", "Dogs"); fun2(2, 12, 13, 14); return 0; } void fun1(int num, ...) { char *str; va_list ptr; va_start(ptr, num); str = va_arg(ptr, char *); printf("%s ", str); } void fun2(int num, ...) { va_list ptr; va_start(ptr, num); num = va_arg(ptr, int); printf("%d", num); }

A. Dogs 12
B. Cats 14
C. Boys 13
D. Apple 12
Answer» E.
Discussion
33.

What will be the output of the program? #include #include void dumplist(int, ...); int main() { dumplist(2, 4, 8); dumplist(3, 6, 9, 7); return 0; } void dumplist(int n, ...) { va_list p; int i; va_start(p, n); while(n-->0) { i = va_arg(p, int); printf("%d", i); } va_end(p); printf("\n"); }

A. 2 4 3 6
B. 2 4 8 3, 6, 9, 7
C. 4 8 6 9 7
D. 1 1 1 1 1 1 1
Answer» D. 1 1 1 1 1 1 1
Discussion
34.

What will be the output of the program? #include #include void display(int num, ...); int main() { display(4, 'A', 'B', 'C', 'D'); return 0; } void display(int num, ...) { char c, c1; int j; va_list ptr, ptr1; va_start(ptr, num); va_start(ptr1, num); for(j=1; j

A. A, AB, BC, CD, D
B. A, aB, bC, cD, d
C. A, 65B, 66C, 67D, 68
D. A, 0B, 0C, 0C, 0
Answer» D. A, 0B, 0C, 0C, 0
Discussion
35.

What will be the output of the program? #include #include void fun(char *msg, ...); int main() { fun("IndiaBIX", 1, 4, 7, 11, 0); return 0; } void fun(char *msg, ...) { va_list ptr; int num; va_start(ptr, msg); num = va_arg(ptr, int); num = va_arg(ptr, int); printf("%d", num); }

A. IndiaBIX 1 7 11 0
B. 1
C. 4
D. 7
Answer» D. 7
Discussion