C Linux Interview Questions and Answers

C Linux interview questions and answers

C Linux interview questions and answers

(1)What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    int a=5;

    printf("%d %d %d",a++,a++,++a);

    return 0;

}

Output:

In LINUX GCC compiler

7 6 8

In TURBO C

7 6 6

Hints: In Turbo c parameter is passed from right to left in printf function but not in the Linux.

(2)What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    int a=5,b=10,c=15,d=20;

    printf("%d %d %d");

        return 0;

}

Output:

In LINUX GCC compiler

Garbage values

In TURBO C

5 10 15

Hints: Local variables stores in the stack.

(3) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    int i=5,j=5,y;

    int x=++i + ++i + ++i;

    y=++j + ++j + ++j;

    printf("%d  %d  %d %d",x,y,i,j);

    return 0;

}

Output:

In LINUX GCC compiler
22  22  8  8

In TURBO C

21  24  8  8

(4) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

        int  near *p;

        int  far *q;

        int  huge *r;

        printf("%d  %d  %d",sizeof(p),sizeof(q),sizeof(r));

        return 0;

}

Output:

In LINUX GCC compiler

Compilation error

In TURBO C

2  4  4

Note: In Linux there is not any concept of near, far and huge pointers

(5) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    char *p;

    int *q;

    float **r;

    printf("%d  %d  %d",sizeof(p),sizeof(q),sizeof(r));

    return 0;

}

Output:

In LINUX GCC compiler

4  4  4

In TURBO C

2  2  2

Hints: size of any type of pointer in Linux is 4 and in turbo c is 2.

(6) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    short int a=5;

    int b=5;

    long int c=5l;

    float d=5.0f;

    double e=5.0;

    long double f=5.0L;

    char g='5';

    printf("Size of short int: %d\n",sizeof(a));

    printf("Size of int: %d\n",sizeof(b));

    printf("Size of long int: %d\n",sizeof(c));

    printf("Size of float: %d\n",sizeof(d));

    printf("Size of double: %d\n",sizeof(e));

    printf("Size of long double: %d\n",sizeof(f));

    printf("Size of char: %d\n",sizeof(g));

        return 0;

}

Output:
In LINUX GCC compiler

Size of short int: 2

Size of int: 4

Size of long int: 4

Size of float: 4

Size of double: 8

Size of long double: 12

Size of char: 1

In TURBO C

Size of short int: 2

Size of int: 2

Size of long int: 4

Size of float: 4

Size of double: 8

Size of long double: 10

Size of char: 1

(7) What will be output if you will execute following program by gcc compiler in Linux?

#include

    int main(){

        int a=300;

    char *p=(char *)&a;

        printf("%d\n",*p);

    printf("%d",*++p);

        return 0;

}

Output:

In LINUX GCC compiler

44

1

In TURBO C

44

1

(8) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    char c='A';

    printf("%d   %d",sizeof(c),sizeof('A'));

    return 0;

}

Output:

In LINUX

1  4

In TURBO C

1  2

(9) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    enum color{RED,BLUE,GREEN=-2,YELLOW,PINK};

    printf("%d  %d",BLUE,PINK);

    return 0;

}

Output:

In LINUX GCC compiler

1 0

In TURBO C

1 0

(10) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

    char c=127;

    printf("%d",++c);

    printf("  %d",++c);

    return 0;

}

Output:

In LINUX GCC compiler

-128 -127

In TURBO C

-128 -127

Hints: char data type cyclic property.

(11) What will be output if you will execute following program by gcc compiler in Linux?

#include"stdio.h"

struct info1{

    char *title;

    long int size;

    double grade;

}hero1;

union info2{

        char *title;

        long int size;

        double grade;

}hero2;

int main(){

    printf("Size of structure: %d\n",sizeof(hero1));

    printf("Size of union:  %d",sizeof(hero2));

    return 0;

}

Output:

In LINUX GCC compiler

Size of structure: 16

Size of union:  8

In TURBO C

Size of structure: 14

Size of union:  8

(12) What will be output if you will execute following program by gcc compiler in Linux?

#define size(x) (char *)(x+1)-(char *)x

#include

int main(){

    long int *p;

    long double *q;

        printf("Size of long int: %d\n",size(p));

    printf("Size of long double: %d",size(q));

        return 0;

}

Output:

In LINUX GCC compiler

Size of long int: 4

Size of long double: 12

In TURBO C

Size of long int: 4

Size of long double: 10

(13) What will be output if you will execute following program by gcc compiler in Linux?

#include

int main(){

      int i=2,j=5,k=3;

      int a=i&&j>=k;

      printf("%d",a);

      return 0;

}

Output:

In LINUX GCC compiler

1

In TURBO C

1

Hints: Any conditional or relational operator returns 1 if condition is true otherwise it returns 0.



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Example of recursion in C programming

Example of recursion in C programming

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Printf objective types interview questions and answers  


(1)

#include

#include

void main()

{

int a=5,b=6,c=11;

clrscr();

printf("%d %d %d");

getch();

}

What will output when you compile and run the above code?

(a)Garbage value garbage value garbage value

(b)5 6 11

(c)11 6 5

(d)Compiler error

Answer: (c)

(2)

#include

void main()

{

char *str="CQUESTIONBANK";

clrscr();

printf(str+9);

getch();

}

What will output when you compile and run the above code?

(a)CQESTIONBANK

(b)CQUESTION

(c)BANK

(d)Compiler error

Answer: (c)

(3)

#include

void main()

{

clrscr();

printf("%d",printf("CQUESTIONBANK"));

getch();

}

What will output when you compile and run the above code?

(a)13CQUESTIONBANK

(b)CQUESTIONBANK13

(c)Garbage CQUESTIONBANK

(d)Compiler error

Answer: (b)

(4)

#include

#include

void main()

{

short int a=5;

clrscr();

printf("%d"+1,a);

getch();

}

What will output when you compile and run the above code?

(a)6

(b)51

(c)d

(d)Compiler error

Answer: (c)

(5)

#include

void main()

{

int i=85;

clrscr();

printf("%p %Fp",i,i);

getch();

}

What will output when you compile and run the above code?

(a)85 85

(b)0055 034E:0055

(c)0055 FFFF:0055

(d)Compiler error

Answer: (b)

 (6)

#include

static struct student

{

int a;

    int b;

    int c;

int d;

}s1={6,7,8,9},s2={4,3,2,1},s3;

void main()

{

s3=s1+s2;

clrscr();

printf("%d %d %d %d",s3.a,s3.b,s3.c,s3.d);

getch();

}

What will output when you compile and run the above code?

(a)6789

(b)4321

(c)10101010

(d)Compiler error

Answer: (d)

(7)

#include

extern struct student

{

int a;

    int b;

    int c;

int d;

}s={6,7,8,9};

void main()

{

clrscr();

printf("%d %d %d %d",s.a,s.b,s.c,s.d);

getch();

}

What will output when you compile and run the above code?

(a)6789

(b)9876

(c)0000

(d)Compiler error

Answer: (a)

(8)

#include

struct student

{

static int a;

register int b;

auto int c;

extern int d;

}s={6,7,8,9};

void main()

{

printf("%d %d % %d",s.a,s.b,s.c,s.d);

}

What will output when you compile and run the above code?

(a)6789

(b)9876

(c)0000

(d)Compiler error

Answer: (d)

(9)

#include

struct student

{

int roll;

int cgpa;

int sgpa[8];

};

void main()

{

struct student s={12,8,7,2,5,9};

int *ptr;

ptr=(int *)&s;

clrscr();

printf("%d",*(ptr+3));

getch();

}

What will output when you compile and run the above code?

(a)8

(b)7

(c)2

(d)Compiler error

Answer: (c)

(10)

#include

struct game

{

int level;

int score;

struct player

{

char *name;

}g2={"anil"};

}g3={10,200};

void main()

{

struct game g1=g3;

clrscr();

printf("%d  %d  %s",g1.level,g1.score,g1.g2.name);

getch();

}

What will output when you compile and run the above code?

(a)10 200 anil

(b)200 10 anil

(c)10 200 null

(d)Compiler error

Answer: (d)

(11)

#include

struct game

{

int level;

int score;

struct player

{

char *name;

}g2;

}g1;

void main()

{

clrscr();

printf("%d  %d  %s",g1.level,g1.score,g1.g2.name);

getch();

}

What will output when you compile and run the above code?

(a)Garbage_value garbage_value garbage_value

(b)0 0 (null)

(c)Run time error

(d)Compiler error

Answer: (b)