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C Programming Questions and Answers – Typedefs

C Programming Questions and Answers – Typedefs

1.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:a

2.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:d

3.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:d

4.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:a

5.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:b

6.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:a

7.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:a

8.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:b

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

View Answer

Answer:d

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

View Answer

Answer:b

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

View Answer

Answer:b

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

View Answer

Answer:b

13.typedef which of the following may create problem in the program

a) ;

b) printf/scanf

c) Arithmetic operators

d) All of the mentioned

View Answer

Answer:d

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

View Answer

Answer:a

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

View Answer

Answer:c

16.What is the output of this C code?

#include <stdio.h>

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

View Answer

Answer:a

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