Explore topic-wise MCQs in C Programming.

This section includes 66 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.

Which of the following correctly represents a constant?

A. 6.68
B. 6.68L
C. 6.68f
D. 6.68LF
Answer» C. 6.68f
Discussion
2.

Which of the structure is incorrcet?

A. 1
B. 2
C. 3
D. 1, 2, 3
Answer» C. 3
Discussion
3.

Which of the structure is correct?

A. 1
B. 2
C. 3
D. All of above
Answer» B. 2
Discussion
4.

A can be used if range of a is not enough to accommodate a real number.

A. True
B. False
Answer» B. False
Discussion
5.

A is 4 bytes wide, whereas a is 8 bytes wide.

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

If the definition of the external variable occurs in the source file before its use in a particular function, then there is no need for an declaration in the function.

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

Size of and can be verified using the operator.

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

Range of is -1.7e-38 to 1.7e+38 (in 16 bit platform - Turbo C under DOS)

A. True
B. False
Answer» C.
Discussion
9.

Size of and would vary from one platform to another.

A. True
B. False
Answer» B. False
Discussion
10.

Range of id -2.25e+308 to 2.25e+308

A. True
B. False
Answer» C.
Discussion
11.

Which of the following is not user defined data type?

A. 1
B. 2
C. 3
D. Both 1 and 2
Answer» C. 3
Discussion
12.

Is the following statement a declaration or definition?

A. Declaration
B. Definition
C. Function
D. Error
Answer» B. Definition
Discussion
13.

Identify which of the following are declarations

A. 1
B. 2
C. 1 and 3
D. 3
Answer» D. 3
Discussion
14.

Is there any difference in the following declarations?

A. Yes
B. No
Answer» B. No
Discussion
15.

Suppose a program is divided into three files and , and a variable is defined in the file but used in files and . In such a case would we need the declaration for the variables in the files and ?

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

Is there any difference between following declarations?

A. Both are identical
B. No difference, except
C. is probably in another file
D. is overrided with
E. None of these
Answer» C. is probably in another file
Discussion
17.

Identify which of the following are declarations_x000D_ _x000D_ _x000D_ 1 :_x000D_ extern int x;_x000D_ _x000D_ _x000D_ 2 :_x000D_ float square ( float x ) { ... }_x000D_ _x000D_ _x000D_ 3 :_x000D_ double pow(double, double);

A. 1
B. 2
C. 1 and 3
D. 3
Answer» D. 3
Discussion
18.

Is the following statement a declaration or definition?_x000D_ extern int i;

A. Declaration
B. Definition
C. Function
D. Error
Answer» B. Definition
Discussion
19.

Which of the following is not user defined data type?_x000D_ _x000D_ _x000D_ 1 :_x000D_ struct book_x000D_ {_x000D_ char name[10];_x000D_ float price;_x000D_ int pages;_x000D_ };_x000D_ _x000D_ _x000D_ 2 :_x000D_ long int l = 2.35;_x000D_ _x000D_ _x000D_ 3 :_x000D_ enum day {Sun, Mon, Tue, Wed};

A. 1
B. 2
C. 3
D. Both 1 and 2
Answer» C. 3
Discussion
20.

What is the output of the program_x000D_ #include_x000D_ int main()_x000D_ {_x000D_ int a[5] = {2, 3};_x000D_ printf("%d, %d, %d\n", a[2], a[3], a[4]);_x000D_ return 0;_x000D_ }

A. Garbage Values
B. 2, 3, 3
C. 3, 2, 2
D. 0, 0, 0
Answer» E.
Discussion
21.

What is the output of the program_x000D_ #include_x000D_ int main()_x000D_ {_x000D_ struct emp_x000D_ {_x000D_ char name[20];_x000D_ int age;_x000D_ float sal;_x000D_ };_x000D_ struct emp e = {"Tiger"};_x000D_ printf("%d, %f\n", e.age, e.sal);_x000D_ return 0;_x000D_ }

A. 0, 0.000000
B. Garbage values
C. Error
D. None of above
Answer» B. Garbage values
Discussion
22.

What will be the output of the program?_x000D_ #include_x000D_ int main()_x000D_ {_x000D_ int X=40;_x000D_ {_x000D_ int X=20;_x000D_ printf("%d ", X);_x000D_ }_x000D_ printf("%d\n", X);_x000D_ return 0;_x000D_ }

A. 40 40
B. 20 40
C. 20
D. Error
Answer» C. 20
Discussion
23.

What will be the output of the program?_x000D_ #include_x000D_ int X=40;_x000D_ int main()_x000D_ {_x000D_ int X=20;_x000D_ printf("%d\n", X);_x000D_ return 0;_x000D_ }

A. 20
B. 40
C. Error
D. No Output
Answer» B. 40
Discussion
24.

What is the output of the program? #include int main() { union a { int i; char ch[2]; }; union a u; u.ch[0] = 3; u.ch[1] = 2; printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); return 0; }

A. 3, 2, 515
B. 515, 2, 3
C. 3, 2, 5
D. None of these
Answer» B. 515, 2, 3
Discussion
25.

What will be the output of the program? #include int main() { int X=40; { int X=20; printf("%d ", X); } printf("%d\n", X); return 0; }

A. 40 40
B. 20 40
C. 20
D. Error
Answer» C. 20
Discussion
26.

Range of float id -2.25e+308 to 2.25e+308

A. 1
B.
Answer» C.
Discussion
27.

What is the output of the program #include int main() { int x = 10, y = 20, z = 5, i; i = x < y < z; printf("%d\n", i); return 0; }

A. 0
B. 1
C. Error
D. None of these
Answer» C. Error
Discussion
28.

What is the output of the program #include int main() { extern int fun(float); int a; a = fun(3.14); printf("%d\n", a); return 0; } int fun(int aa) { return (int)++aa; }

A. 3
B. 3.14
C. 0 
D. 4
Answer» E.
Discussion
29.

What is the output of the program #include int main() { int a[5] = {2, 3}; printf("%d, %d, %d\n", a[2], a[3], a[4]); return 0; }

A. Garbage Values
B. 2, 3, 3
C. 3, 2, 2
D. 0, 0, 0
Answer» E.
Discussion
30.

Is it true that a global variable may have several declarations, but only one definition?

A. Yes
B. No
Answer» B. No
Discussion
31.

Point out the error in the following program. #include int main() { void v = 0; printf("%d", v); return 0; }

A. Error: Declaration syntax error 'v' (or) Size of v is unknown or zero.
B. Program terminates abnormally.
C. No error.
D. None of these.
Answer» B. Program terminates abnormally.
Discussion
32.

What is the output of the program #include int main() { struct emp { char name[20]; int age; float sal; }; struct emp e = {"Tiger"}; printf("%d, %f\n", e.age, e.sal); return 0; }

A. 0, 0.000000
B. Garbage values
C. Error
D. None of above
Answer» B. Garbage values
Discussion
33.

Which of the following is not user defined data type? 1 : struct book { char name[10]; float price; int pages; }; 2 : long int l = 2.35; 3 : enum day {Sun, Mon, Tue, Wed};

A. 1
B. 2
C. 3
D. Both 1 and 2
Answer» C. 3
Discussion
34.

What will be the output of the program in 16 bit platform (Turbo C under DOS)? #include int main() { extern int i; i = 20; printf("%d\n", sizeof(i)); return 0; }

A. 2
B. 4
C. vary from compiler
D. Linker Error : Undefined symbol 'i'
Answer» E.
Discussion
35.

What is the output of the program in Turbo C (in DOS 16-bit OS)? #include int main() { char *s1; char far *s2; char huge *s3; printf("%d, %d, %d\n", sizeof(s1), sizeof(s2), sizeof(s3)); return 0; }

A. 2, 4, 6
B. 4, 4, 2
C. 2, 4, 4
D. 2, 2, 2
Answer» D. 2, 2, 2
Discussion
36.

Which of the structure is incorrcet? 1 : struct aa { int a; float b; }; 2 : struct aa { int a; float b; struct aa var; }; 3 : struct aa { int a; float b; struct aa *var; };

A. 1
B. 2
C. 3
D. 1, 2, 3
Answer» C. 3
Discussion
37.

Which of the structure is correct? 1 : struct book { char name[10]; float price; int pages; }; 2 : struct aa { char name[10]; float price; int pages; } 3 : struct aa { char name[10]; float price; int pages; }

A. 1
B. 2
C. 3
D. All of above
Answer» B. 2
Discussion
38.

Point out the error in the following program. #include int main() { int (*p)() = fun; (*p)(); return 0; } int fun() { printf("IndiaBix.com\n"); return 0; }

A. Error: in int(*p)() = fun;
B. Error: fun() prototype not defined
C. No error
D. None of these
Answer» C. No error
Discussion
39.

Size of short integer and long integer would vary from one platform to another.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
40.

Suppose a program is divided into three files f1, f2 and f3, and a variable is defined in the file f1 but used in files f2 and f3. In such a case would we need the extern declaration for the variables in the files f2 and f3?

A. Yes
B. No
Answer» B. No
Discussion
41.

Identify which of the following are declarations 1 : extern int x; 2 : float square ( float x ) { ... } 3 : double pow(double, double);

A. 1
B. 2
C. 1 and 3
D. 3
Answer» D. 3
Discussion
42.

In the following program how long will the for loop get executed? #include int main() { int i=5; for(;scanf("%s", &i); printf("%d\n", i)); return 0; }

A. The for loop would not get executed at all
B. The for loop would get executed only once
C. The for loop would get executed 5 times
D. The for loop would get executed infinite times
Answer» E.
Discussion
43.

A float is 4 bytes wide, whereas a double is 8 bytes wide.

A. 1
B.
Answer» B.
Discussion
44.

In the following program where is the variable a getting defined and where it is getting declared? #include int main() { extern int a; printf("%d\n", a); return 0; } int a=20;

A. extern int a is declaration, int a = 20 is the definition
B. int a = 20 is declaration, extern int a is the definition
C. int a = 20 is definition, a is not defined
D. a is declared, a is not defined
Answer» B. int a = 20 is declaration, extern int a is the definition
Discussion
45.

Range of double is -1.7e-38 to 1.7e+38 (in 16 bit platform - Turbo C under DOS)

A. 1
B.
Answer» C.
Discussion
46.

If the definition of the external variable occurs in the source file before its use in a particular function, then there is no need for an extern declaration in the function.

A. 1
B.
Answer» B.
Discussion
47.

Is the following statement a declaration or definition? extern int i;

A. Declaration
B. Definition
C. Function
D. Error
Answer» B. Definition
Discussion
48.

Which of the following correctly represents a long double constant?

A. 6.68
B. 6.68L
C. 6.68f
D. 6.68LF
Answer» C. 6.68f
Discussion
49.

What will be the output of the program? #include int X=40; int main() { int X=20; printf("%d\n", X); return 0; }

A. 20
B. 40
C. Error
D. No Output
Answer» B. 40
Discussion
50.

Size of short integer and long integer can be verified using the sizeof() operator.

A. 1
B.
Answer» B.
Discussion