objective type questions in c programming language set-6

1. Which symbol is used as a statement terminator in C?

A) !

B) ~

C) #

D) ;


2. If the size of the array is less than the number of initializes then, ..........

A) extra values are being ignored

B) generates an error message

C) size of array is increased

D) size is neglected when values are given


3. In C, if you pass an array as an argument to a function, what actually gets passed?

A) Value of elements in array

B) First element of the array

C) Base address of the array

D) Address of the last element of array


4. How many times the following loop be executed? { .. ch='b'; while (ch>='a' && ch<=='z') ch++; }

A) 0

B) 25

C) 26

D) 1


5. If a=8 and b=15 then the statement x=(a>b) ? a:b;


A) assigns a value 8 to x

B) gives an error message

C) assigns a value 15 to x

D) assigns a value 7 to x


6. What is the output of the following code. int n=0, m=1; do { printf("%d", m); m++; } while (m<=n);

A) 0

B) 2

C) 1

D) 4


7. A C program contains the following declaration int i=8, j=5 what would be the value of following expression? abs(i-2*j)
A) 2

B) 4

C) 6

D) 8


8. The output of the following is . int a=75; printf("%d%%", a);

A) 75

B) 75%%

C) 75%

D) None of the above


9. How many times the following program would print ("abc")? main( ) { printf("\nabc"); main( ); }

A) Infinite number of times

B) 32767 times

C) 65535 times

D) Till the stack does not overflow


10. Which of the following is the correct usage of conditional operators used in C?

A) a>b?c=30:c=40;

B) a>b?c=30;

C) max=a>b?a>c?a:c:b>c?b:c

D) return (a>b)?(a:b)

Answers:

1. Which symbol is used as a statement terminator in C?

D) ;

2. If the size of the array is less than the number of initializes then, ..........

B) generates an error message

3. In C, if you pass an array as an argument to a function, what actually gets passed?

C) Base address of the array

4. How many times the following loop be executed? { .. ch='b'; while (ch>='a' && ch<=='z') ch++; }

B) 25

5. If a=8 and b=15 then the statement x=(a>b) ? a:b;

C) assigns a value 15 to x

6. What is the output of the following code. int n=0, m=1; do { printf("%d", m); m++; } while (m<=n);

C) 1

7. A C program contains the following declaration int i=8, j=5 what would be the value of following expression? abs(i-2*j)
A) 2

8. The output of the following is . int a=75; printf("%d%%", a);

D) None of the above

9. How many times the following program would print ("abc")? main( ) { printf("\nabc"); main( ); }

A) Infinite number of times

10. Which of the following is the correct usage of conditional operators used in C?

C) max=a>b?a>c?a:c:b>c?b:c

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Solved MCQ on C Programming Language set-5

1. What will be output of the following C program? #include int main() {int goto=5; printf("%d",goto); return 0;}

A) 5

B) 10

C) **

D) compilation error


2. Output of the following C program fragment is. x=5; y=x++; printf("%d %d", x,y);

A) 5, 6

B) 5, 5

C) 6, 5

D) 6, 6


3. What will be output of the following C program? #include int xyz=10; int main() { int xyz=20; printf("%d", xyz); return 0;}

A) 10

B) 20

C) 30

D) compilation error


4. Following program fragment. main(){ printf("%p\n", main( ) ); }

A) Prints the address of main function

B) Prints 0

C) Is an error

D) In an infinite loop


5. What will be output of the following program? #include int main() {int a=2, b=7, c=10; c=a==b; printf("%d",c); return 0;}

A) 0

B) 7

C) 10

D) 2


6. What is the output of the following program segment? main( ) { long i=65536; printf("%d\n", i); }

A) 0

B) 65536

C) -1

D) 65


7. What will be the output of the program? # include int main() {int a[5]={5,1,15,20,25}; int i, j, m; i=++a[1]; j=a[1]++; m=a[i++]; printf("%d, %d, %d", i,j,m); return0;}

A) 2, 1, 15

B) 1, 2, 5

C) 3, 2, 15

D) 2, 3, 20


8. What is the output of the following program segment? main( ) { int=1; do { printf("%d . . ", i); } while (i--); }

A) 0 . . 1 . .

B) 1 . . 0 . .

C) 0

D) -1


9. Output of the program below is. int i; main( ) { printf("%d", i); }

A) 1

B) 0

C) -1

D) Null


10. What will be the output of the following program? main( ) { int i=5; printf("%d", i=++i==6); }

A) 0

B) 7

C) 6

D) 1

Answers:

1. What will be output of the following C program? #include int main() {int goto=5; printf("%d",goto); return 0;}

A) 5

2. Output of the following C program fragment is. x=5; y=x++; printf("%d %d", x,y);

C) 6, 5

3. What will be output of the following C program? #include int xyz=10; int main() { int xyz=20; printf("%d", xyz); return 0;}

B) 20

4. Following program fragment. main(){ printf("%p\n", main( ) ); }

A) Prints the address of main function

5. What will be output of the following program? #include int main() {int a=2, b=7, c=10; c=a==b; printf("%d",c); return 0;}

A) 0

6. What is the output of the following program segment? main( ) { long i=65536; printf("%d\n", i); }

A) 0

7. What will be the output of the program? # include int main() {int a[5]={5,1,15,20,25}; int i, j, m; i=++a[1]; j=a[1]++; m=a[i++]; printf("%d, %d, %d", i,j,m); return0;}

C) 3, 2, 15

8. What is the output of the following program segment? main( ) { int=1; do { printf("%d . . ", i); } while (i--); }

B) 1 . . 0 . .

9. Output of the program below is. int i; main( ) { printf("%d", i); }

B) 0

10. What will be the output of the following program? main( ) { int i=5; printf("%d", i=++i==6); }

D) 1

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MCQ on C Programming With Answers set-4

1. 'C' is often called a ....

A) Object oriented language

B) High level language

C) Assembly language

D) Machine level language


2. Each C preprocessor directive begins with ....

A) #

B) include

C) main()

D) {


3. C allows arrays of greater than two dimensions, who will determine this?

A) programmer

B) compiler

C) parameter

D) None of the above


4. The << operator is used for

A) Right shifting

B) Left shifting

C) Bitwise shifting

D) Bitwise complement


5. Set of values of the same type, which have a single name followed by an index is called

A) function

B) structure

C) array

D) union


6. Which of the following header file is required for strcpy() function?

A) String.h

B) Strings.h

C) file.h

D) strcpy()


7. scanf() can be used for reading ...

A) double character

B) single character

C) multiple characters

D) no character


8. A variable which is visible only in the function in which it is defined is called

A) Static variable

B) auto variable

C) external variable

D) local variable


9. In the loop structure logical expression is checked at the ....................of the loop.

A) first

B) end

C) middle

D) second


10. If an array is used as function argument, the array is passed

A) by value

B) by reference

C) by name

D) the array cannot be used as function argument


11. If is necessary to declare the type of function in the calling program if

A) Function returns an integer

B) Function returns a non-integer value

C) Function is not defined in the same file

D) Function is called number of times


12. Which escape character can be used to begin a new line in C ........

A) \a

B) \m

C) \b

D) \n


13. Input/output function prototypes and macros are defined in which header file?

A) conio.h

B) stdlib.h

C) stdio.h

D) dos.h


14. What is the purpose of fflush() function?

A) flushes all streams and specified streams

B) flushes only specified stream

C) flushes input/output buffer

D) flushes file buffer


15. What does the following declaration mean?int(*ptr)[10].

A) ptr is array of pointers to 10 integers.

B) ptr is a pointer to an array of 10 integers

C) ptr is an array of 10 integers

D) ptr is an pointer to array

Answers:

1. 'C' is often called a ....

B) High level language

2. Each C preprocessor directive begins with ....

A) #

3. C allows arrays of greater than two dimensions, who will determine this?

B) compiler

4. The << operator is used for

B) Left shifting

5. Set of values of the same type, which have a single name followed by an index is called

C) array

6. Which of the following header file is required for strcpy() function?

A) String.h

7. scanf() can be used for reading ...

C) multiple characters

8. A variable which is visible only in the function in which it is defined is called

D) local variable

9. In the loop structure logical expression is checked at the ....................of the loop.

A) first

10. If an array is used as function argument, the array is passed

B) by reference

11. If is necessary to declare the type of function in the calling program if

B) Function returns a non-integer value

12. Which escape character can be used to begin a new line in C ........

D) \n

13. Input/output function prototypes and macros are defined in which header file?

C) stdio.h

14. What is the purpose of fflush() function?

A) flushes all streams and specified streams

15. What does the following declaration mean?int(*ptr)[10].

B) ptr is a pointer to an array of 10 integers

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How to validate required field in a form using javascript

In a wave form, fields are needs to validate at the time of entry or on submission of form. Generally in a form it needs to validate user has left required fields empty or not, user has entered valid e-mail address or not, user has entered a valid date, user has entered text in a numeric field or not and other also. 

Here is a function below to validate if a required field has been left empty. If the required field is blank, an alert box alerts a message and the function returns false. If a value is entered, the function returns true.

 Function to validate required field in a form using javascript

function validate_required(field, alerttxt)
{
with (field)
{
if (value==null||value=="")
	{alert(alerttxt); return false}
else {return true}
}
}

Full script, with the HTML form to validate required field 

<!DOCTYPE html>
<html>
<head>
<script>
function validate_required(field, alerttxt)
{
with (field)
{
if (value==null||value=="")
	{alert(alerttxt); return false}
else {return true}
}
}

function validate_form(thisform)
{
with(thisform)
{
if(validate_required(email, "Email must be filled out!")==false)
	{email.focus();return false}
}
}
</script>
</head>

<body>
<form action="submitpage.htm" onsubmit="return validate_form(this)" method="post">
Email:<input type="text" name="email" size="40">
<input type="submit" value="submit">
</form>
</body>

</html>

Preview of the above code, to validate required field 

Email:

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MCQ on Java Programming With Answers set-11

1. If m and n are int type variables, what will be the result of the expression m%n when m=-14 and n=-3?

A) 4

B) 2

C) -2

D) -4



2. Consider the following code

if(number>=0)

    if(number>0)

    system.out.println("Number is positive");

else

    system.out.println("Number is negative");

What will be the output if number is equal to 0?

A) Number is negative

B) Number is positive

C) Both A and B

D) None of the above



3. Consider the following code:

char c='a';

switch (c)

{
     case 'a';

     system.out.println("A");

     case 'b'; 

     system.out.println("B");

     default; 


system.out.println("C");
} 

For this code, which of the following statement is true?

A) Output will be A

B) Output will be A followed by B

C) Output will be A, followed by B, and then followed by C

D) Code is illegal and therefore will not compile



4. Consider the following class definition.

class Student extends String

  {
  }

What happens when we try to compile this class?


A) Will not compile because class body is not defined

B) Will not compile because the class in not declared public.

C) Will not compile because string is abstract.

D) Will not compile because string is final.



5. What is wrong in the following class definitions?

abstract class print

{
  abstract show();
}
class Display extends Print
{
}

A) Nothing is wrong

B) Wrong. Method show() should have a return type

C) Wrong. Method show() is not implemented in Display

D) Wrong. Display does not contain any numbers.



6. What is the error in the following class definitions?

abstract class XY
{
  abstract sum(int x, int y){    }
}

A) Class header is not defined properly

B) Constructor is not defined

C) Method is not defined properly

D) No error.




7. Which of the following statements are true?

i) We cannot use abstract classes to instantiate objects directly.

ii) The abstract methods of an abstract class must be defined in its subclass.

iii) We cannot declare abstract constructors.

iv) We may declare abstract static methods.

A) Line i only

B) Line ii only

C) Line i and ii only

D) Line i, ii and iii only




8. We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would archive this?

A) Private

B) Protected

C) Public

D) Private Protected




9. The use of protected keyword to a member in a class will restrict its visibility as follows:

A) Visible only in the class and its subclass in the same package.

B) Visible only inside the same package.

C) Visible in all classes in the same package and subclasses in other packages

D) Visible only in the class where it is declared.




10. Consider the following code:

interface Area
{
  float compute (float x, float y);
}
class Room implements Area
{
  float compute (float x, float y)

      {
  return(x&y);
 }
 }

What is wrong with the code?

A) Interface definition is incomplete

B) Method compute() in interface Area should be declared public

C) Method compute() in class Room should be declared public

D) All the above

Answers:

1. If m and n are int type variables, what will be the result of the expression m%n when m=-14 and n=-3?

C) -2


2. Consider the following code

if(number>=0)
    if(number>0)
    system.out.println("Number is positive");
else
    system.out.println("Number is negative");

What will be the output if number is equal to 0?

A) Number is negative


3. Consider the following code:

char c='a';
switch (c)
{
     case 'a';
     system.out.println("A");
     case 'b'; 
     system.out.println("B");
     default; 
     system.out.println("C");
} 

For this code, which of the following statement is true?

B) Output will be A followed by B


4. Consider the following class definition.

  class Student extends String
  {
  }

What happens when we try to compile this class?

D) Will not compile because string is final.


5. What is wrong in the following class definitions?

abstract class print
{
    abstract show();
}
class Display extends Print
{
}

C) Wrong. Method show() is not implemented in Display


6. What is the error in the following class definitions?

abstract class XY
{
   abstract sum(int x, int y){    }
}

C) Method is not defined properly


7. Which of the following statements are true?

i) We cannot use abstract classes to instantiate objects directly.

ii) The abstract methods of an abstract class must be defined in its subclass.

iii) We cannot declare abstract constructors.

iv) We may declare abstract static methods.

D) Line i, ii and iii only


8. We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would archive this?

D) Private Protected


9. The use of protected keyword to a member in a class will restrict its visibility as follows:

C) Visible in all classes in the same package and subclasses in other packages

10. Consider the following code:

interface Area
{
     float compute (float x, float y);
}
class Room implements Area
{
    float compute (float x, float y)
      {
           return(x&y);
      }
 }

What is wrong with the code?

C) Method compute() in class Room should be declared public

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Write a Program in C to Find if a Number is Present in a List or not

Here is a C program to find if a number is present in a list of N numbers or not.


In this program for loop is used to search a number from the list of numbers and array of numbers is used to insert numbers in a list.


If the searched number is matched with any number in the list it throws to print it is presented in the list and if the searched number is not matched with any number in the list it throws to print it is not presented in the list.

 A C Program to Find if a Number is Present in a List of N numbers or not

Steps:

1.  At first declare integers i, n, m, and array of integers a[10].
2. Print the message to enter how many elements want to insert and allow to insert.
3. Print the message to enter the elements in the array.
4. Use for loop to find out whether the given number is present in the list or not.
5. Print the message on the screen whether the given number is present in the list or not.

Code:

#include<stdio.h>
#include<conio.h>

void main()
{
	int i,n,m,flag=0; int a[10];
	clrscr();

	printf("How many elements you want to enter \n");
	scanf("%d",&n);

	printf("Enter element in the array \n");
	for (i=0; i<n; i++)
	scanf("%d", &a[i]);

	printf("Enter the element you want to search \n");
	scanf("%d", &m);

	for (i=0; i<n; i++)
		{
			if(a[i]==m)
			{
			flag=1;
			break;
			}
		}
	if(flag==0)
		printf("Not present");
	else
		printf("Present");
	getch();
}

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C Program to Find the Sum and Average of Numbers Using Do-While Loop

In this program sum and average of of the given numbers are calculated using do-while loop.

Do-while loop is a looping condition where statements are executed continuously until the condition validates and test the condition after having executed the statements within the loop.

This means that do-while would execute its statements at least once, even if the condition fails for the first time.

 

Scanf() command is used here to allow enter the numbers and sum=sum+num; to sum the numbers within do-while loop.

C Program to Find the Sum and Average of Numbers Using Do-While Loop

Steps: 

1.  Declare two integers i and n and also initialize i with 0.
2. Declare three floats sum, avg and num and initialize sum with 0.
3. Print the message on the screen to enter how many numbers want to find sum.
4. Use do-while loop to insert the numbers calculate the sum and average.

Code:

#include<stdio.h>
#include<conio.h>



void main()
{

 int i=0,n;
 float sum, avg, num;

 clrscr();

 sum=0;

 printf("How many numbers you want to find sum and average\n");
 scanf("%d",&n);

 printf("Enter the numbers\n");

 do{
  scanf("%f", &num);
  sum=sum+num;
  i++;
 }

 while (i<n);

 avg=sum/n;

 printf("Sum=%f\n", sum);
 printf("Average=%f\n", avg);
 getch();
}

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