C Programming – Typedefs

C Programming - Typedefs

Question 1

What is the output of this C code?

    #include 
    typedef struct student
    {
    char *a;
    }stu;
    void main()
    {
    struct stu s;
    s.a = "hi";
    printf("%s", s.a);
    }

A	Compile time error
B	Varies
C	hi
D	h

Question 2

What is the output of this C code?

    #include 
    typedef struct student
    {
    char *a;
    }stu;
    void main()
    {
    struct student s;
    s.a = "hey";
    printf("%s", s.a);
    }

A	Compile time error
B	Varies
C	he
D	hey

Question 3

What is the output of this C code?

    #include 
    typedef int integer;
    int main()
    {
    int i = 10, *ptr;
    float f = 20;
    integer j = i;
    ptr = &j;
    printf("%d\n", *ptr);
    return 0;
    }

A	Compile time error
B	Undefined behaviour
C	Depends on the standard
D	10

Question 4

What is the output of this C code?

    #include 
    int (*(x()))[2];
    typedef int (*(*ptr)())[2] ptrfoo;
    int main()
    {
    ptrfoo ptr1;
    ptr1 = x;
    ptr1();
    return 0;
    }
    int (*(x()))[2]
    {
    int (*ary)[2] = malloc(sizeof*ary);
    return &ary;
    }

A	Compile time error
B	Nothing
C	Undefined behaviour
D	Depends on the standard

Question 5

What is the output of this C code?

    #include 
    int *(*(x()))[2];
    typedef int **(*ptrfoo)())[2];
    int main()
    {
    ptrfoo ptr1;
    ptr1 = x;
    ptr1();
    return 0;
    }
    int *(*(x()))[2]
    {
    int (*ary)[2] = malloc(sizeof * ary);
    return &ary;
    }

A	Compile time error
B	Nothing
C	Undefined behaviour
D	Depends on the standard

Question 6

What is the output of this C code?

    #include 
    typedef struct p
    {
    int x, y;
    };
    int main()
    {
    p k1 = {1, 2};
    printf("%d\n", k1.x);
    }

A	Compile time error
B	1
C	0
D	Depends on the standard

Question 7

What is the output of this C code?

    #include 
    typedef struct p
    {
    int x, y;
    }k = {1, 2};
    int main()
    {
    p k1 = k;
    printf("%d\n", k1.x);
    }

A	Compile time error
B	1
C	0
D	Depends on the standard

Question 8

What is the output of this C code?

    #include 
    typedef struct p
    {
    int x, y;
    }k;
    int main()
    {
    struct p p = {1, 2};
    k k1 = p;
    printf("%d\n", k1.x);
    }

A	Compile time error
B	1
C	0
D	Depends on the standard

Question 9

The correct syntax to use typedef for struct is.

A	typedef struct temp { int a; }TEMP;
B	typedef struct { int a; }TEMP;
C	struct temp { int a; }; typedef struct temp TEMP;
D	All of the mentioned

Question 10

For the following expression to work, which option should be selected.    string p = “HELLO”;

A	typedef char [] string;
B	typedef char *string;
C	Both (a) and (b)
D	Such expression cannot be generated in C

Question 11

 Which of the given option is the correct method for initialization?     typedef char *string;

A	*string *p = “Hello”;
B	string p = “Hello”;
C	*string p = ‘A’;
D	Not more than one space should be given when using typedef

Question 12

Which of the following is FALSE about typedef?

A	typedef follow scope rules
B	typedef defined substitutes can be redefined again. (Eg: typedef char a; typedef int a;)
C	You cannot typedef a typedef with other term.
D	All of the mentioned

Question 13

 typedef which of the following may create problem in the program

A	;
B	printf/scanf
C	Arithmetic operators
D	All of the mentioned

Question 14

typedef int (*PFI)(char *, char *)creates

A	type PFI, for pointer to function (of two char * arguments) returning int
B	Error
C	type PFI, function (of two char * arguments) returning int
D	type PFI, for pointer

Question 15

 typedef declaration

A	Does not create a new type
B	It merely adds a new name for some existing type.
C	Both a & b
D	None of the mentioned

Question 16

What is the output of this C code?

    #include 
    typedef struct student
    {
    char *a;
    }stu;
    void main()
    {
    stu s;
    s.a = "hi";
    printf("%s", s.a);
    }s

A	Compile time error
B	Varies
C	hi
D	h

Check Your Answers:

  1. A

  2. D

  3. D

  4. A

  5. B

  6. A

  7. A

  8. B

  9. D

10. B

11. B

12. B

13. D

14. A

15. C

16. A

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