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programming languages Online Quiz - 54

Description: programming languages Online Quiz - 54
Number of Questions: 20
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Tags: programming languages

Which is not a browser?

  1. Lynx

  2. Emacs/w3

  3. links

  4. browsee

Answer: 4

What is the output of the command $sed 's/([a-z]) *([a-z])/\2,\1/' file

  1. sAGAR,PRAVEEN

  2. Sagar, praveen

  3. ,SAGAR,PRAVEEN

  4. sagar,Praveen

Answer: 2

What is the latest stable version of the linux kernal?

  1. 2.6.37R

  2. 2.6.37

  3. 2.6.38

  4. 2.6.55

Answer: 2

How to clear the console?

  1. clear

  2. reset

  3. tput clear

  4. all

Answer: 4

mutt is a

  1. mail client

  2. web browser

  3. text browser

  4. backup engine

Answer: 1

How can we know the type of a file?

  1. type filename

  2. type - -info filename

  3. file filename

  4. none

Answer: 3

How can preserve timestamps of a file while copying

  1. bydeflut it preserves

  2. cp -in

  3. cp -p

  4. cp -t

Answer: 3

$touch {a}_{b,c} What is the output

  1. creates a_b,c file

  2. syntax error

  3. changes the timestamps of a_bc file

  4. creates a_b and a_c files

Answer: 4

what is the command to list inode number along its file long listing?

  1. ls -n

  2. ll -d

  3. ls -il

  4. lsi

Answer: 3

What is the command to display a file in reverse

  1. rev filename

  2. cat -r filename

  3. tac filename

  4. filerev filename

Answer: 3

What gets printed? int i = 3; if (!i) i++; i++; if (i==3) i+=2; i+=2; printf("%d\n", i);

  1. 6

  2. 7

  3. 3

  4. 5

Answer: 1

Which takes the first precedence in evaluation among the following operators?

  1. ||

  2. !

  3. &&

  4. All the Above has equal precedence

Answer: 2

What is the output?int i = 3;if (!i) i++; i++;if (i==3) i+=2; i+=2;printf("%d\n", i);

  1. 3

  2. 5

  3. 7

  4. 6

Answer: 4

In theory, which is faster, the call to strcpy or the call to memcpy? #include #include int main(){ char msg[12] = "Hello World"; char buffer1[12]; char buffer2[12]; strcpy(buffer1, msg); memcpy(buffer2, msg, sizeof(msg)); return 0; }

  1. strcpy

  2. memcpy

  3. both memcpy and strcpy

  4. none

Answer: 2

Which of the following differences between malloc and calloc are true? 1) malloc allocates number of bytes passed as argument 2) calloc allocates the product of number of elements multiplied by the size of each element, which are both passed as arguments. 3) both malloc and calloc return void* 4) both malloc and calloc initialize allocated memory to all 0

  1. 1, 2, 3, 4

  2. 1, 2, 3

  3. 1,2

  4. 1

Answer: 2

The code used for denoting unsigned decimal integer in scanf is :

  1. %d

  2. %ud

  3. %u

  4. all the above

Answer: 3

Given: 31. // some code here 32. try { 33. // some code here 34. } catch (SomeException se) { 35. // some code here 36. } finally { 37. // some code here 38. } Under which three circumstances will the code on line 37 be executed? (Choose three.)

  1. The instance gets garbage collected.

  2. The code on line 33 throws an exception.

  3. . The code on line 35 throws an exception

  4. The code on line 31 throws an exception

  5. The code on line 33 executes successfully

Answer: 2,3,5

What will happen? int main(int argc, char*argv) { char ptr = NULL; free(ptr); return 0; }

  1. core dump

  2. nothing

  3. undefined behavior

  4. all the above

Answer: 2

Given: 1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a = 5; } 14. } Which two, independently, will allow Sub to compile? (Choose two.)

  1. Change line 2 to:public int a;

  2. Change line 2 to:protected int a;

  3. Change line 13 to:public Sub() { this(5); }

  4. Change line 13 to:public Sub() { super(5); }

Answer: 3,4

Which of the following denotes file modes that can be used in C program?

  1. "r"

  2. "w"

  3. "a"

  4. all the above

Answer: 4
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