12th Class Computer Science Chapter 10 Short Questions with Answers Solved

Question: 1

Find the error in the following code.

#include (conio,);

#include (stdio.h);

Void main ()

{

printf("OK");

}

Answer: 1

1-95

Errors: Error is brackets do not used in library.

Question: 2

What is the use of printf() function?

Answer: 2

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Use of printf() Function:To see results of program execution, we must have a way to specify what variables values should be displayed . The standard library function printf (pronounced as print -eff) has been used for formatted output . It takes as arguments a format string and an optional list of variable to output.

Question: 3

What is Control String in printf function?

Answer: 3

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Control String: The format of each expression may be controlled using a control string that precedes the expression and is separated by a colon(:).These control string use the same structured as the control strings in C printf() routines.

Example: The following specifies that each element of the parallel array .A will be printed to 5 decimal places.

Control strings also may be applied to sequential expressions.

The colons have been used strictly to separate control strings from expressions, so each colon must follow a string and precede an expression.

Question: 4

Find the error in the following code.

Main();

{

printf(OK)

}

Answer: 4

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Errors: Error is " " commas are not present with OK in printf statement .

Question: 5

Trace the Errors .

Int b =8;

Int c =0

C =number

Print f ("%f",x)

Answer: 5

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Errors: Errors is x variable is not present which is written in printf statement

Question: 6

Predict the output of the following code.

{

Printf(."Hello World");

}

Answer: 6

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Output: Hello World

Question: 7

List some important functions for output.

Answer: 7

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Output Function in C-language:

Putchar()
Putch()
Puts()
printf()

Question: 8

Trace the errors in the following code.

#include <std.n>

Void main (void)

{

Printf ('Pakistan");

}

Answer: 8

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Errors: Erros is wrong library has been used.

Question: 9

Find the errors from the following code.

#include <stdio.h>

#incluse<conio.h>

{

Void main();

printf (" Assembly Language");

}

Answer: 9

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Errors: Errors is bracket is not correctly used in Main body.

Question: 10

Write the syntax of printf() statement.

Answer: 10

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Printf(format string,&var,& var2,& var3,.......);

printf (format string);

Question: 11

What is the output of the following code?

Answer: 11

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Printf ("I\Love\n programming");

Output: I

Love

programming

Question: 12

Find the output of the following code segment.

Int x = 10;

Int y = 5;

Int z = x+y;

Printf ("%d %d %d",x, y,z);

Answer: 12

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Output: x = 10

y = 5

z = 15

Question: 13

Give single print statement to print the following message 'I Love Pakistan".

Answer: 13

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Single Print Statement:

printf("I\N Love \n Pakistan");

Question: 14

Show Output.

Inti =515

Printf (" =%5d",i);

Printf (" =%2d",i);

Answer: 14

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Output: I =515

I =51

Question: 15

Find Errors.

Main [ ];

(Float n;

Print f ('%dn);

}

Answer: 15

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Errors:

1st error is wrong brackets have been used with Main word
2nd error is wrong brackets have been used with Main's body
3rd error is variable n is not defines but it has been used in printf statement.

Question: 16

Write the Output of the following code :

Main()

{

printf("444\n");

printf("44");

}

Answer: 16

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444

44

Question: 17

Find Errors in the following code.

Void main ( )

{

int num =10,

num + =5;

printf("\n %d" ,num);

}

Answer: 17

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Errors:

Errors is ; terminator has not been used in statement where variable num is defined.

Question: 18

Find the error in the following code .

Void main ();

{

int num =10;

printf("%d,a);

}

Answer: 18

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Errors:

Errors is Capital A is defined in int A= 10 statement but in printf statement small 'a' has been used

Question: 19

Find Error.

{

Float area ,r;

Printf ("Enter radius");

}

Answer: 19

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Errors:

1st error is no library has been used in program.
2nd error is Mian body is not defined.

Question: 20

Give single print statement to print the following message.

No.of employees

No.of officers

Answer: 20

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Single Print Statement:

printf("No.\n of \n employee");

printf(No.\n of \ n officers" );

Question: 21

Trace the error.

#include <stdio.h>

Void main (void)

Printf("Hello World");

Answer: 21

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Errors: Errors is bracket have not been used in Main body.

Question: 22

Trace the errors.

#include<stdio.h>

Void main()

{

printf ("High Level Language")

}

Answer: 22

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Errors:

Errors is terminator sign has not been used in printf statement.

Main()

{

printf("555\n");

printf ("55");

}

Question: 23

Find the Output of the following code.

#include <stdio.h>

Void main ()

{

int x =10, y= 20, z = 30;

x= x+y;

y =y+z;

z= x-y;

printf("result =%d%d%d",x,y,z);

Answer: 23

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Output :

Result = 30 50 -20

Question: 24

Find the output.

#include <stdio.h>

Void main()

{

Int x, y;

X=10; y=20;

Printf(%d%d,x,y);

}

Answer: 24

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Output:

X=10

Y=20

Question: 25

Trace the error in the following C code.

#include <stdio.h>

Void main()

{

prin ("C Language is interesting");

Answer: 25

25-95

Error:

Error is printf statement in not complete.

Question: 26

Find the error in the following code.

Main();

{

printf("Hellow);

}

Answer: 26

26-95

Error: Error is both commas is not written in printf statement.

Question: 27

Trace the error in the following code.

#include(stdio.h);

Void main()

{

Printf ("OK");

}

Answer: 27

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Errors:

1st error is brackets have been used in library which is not allowed.
2nd error is both commas are not written in printf statement.

Question: 28

Trace the error.

#include <stdio.h>

Main()

{

printf("Hello world")

}

Answer: 28

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Errors:

Errors is ; semicolon is not written in printf statement.

Question: 29

What is the use of field width specifier?

Answer: 29

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Field Width Specifier: In a C program, the number of columns used to display a value on the screen is referred to a field width.

Field width: Field-width specifiers describe the number of columns that should be used to print a value.

Question: 30

Trace the error in th following code.

#include (std10.h)

Void main (void);

{

x = 5;

y = 6;

z = x+y;

printf ("%d",z);

}

Answer: 30

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Errors: Errors is wrong library has been used in program.

Question: 31

Trace Error.

Include<STDIO.H>

VOID Main ();

{

printf ("Pakistan")

}

Answer: 31

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Error:

1st error is library is written in capital letter which is not allowed.
2nd error is word void is written in capital letter which is not allowed

Question: 32

Trace output :

Int a =512;

Printf ("a+= %5d",a);

Printf ("a =%1d",a);

Answer: 32

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Output:

a= 512

a=512

Question: 33

What is format specifier ?

Answer: 33

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Format Specifier: Format specifier specify the information in which the value of the variable should be displayed on the screen . Format specifiers are specified in the format string.

Example: The following will show about format specifiers.

#include <stdio.h>

Void main (void)

{

Float var1, var2, res;

Var1 =24.27

var2 =41.50;

res var1 + var2;

Printf ("%f+%f =%f" ,var1, var2, res);

}

Here is the output of the program

24027+41.5 =65.77

Question: 34

Find the error in the following code.

Main();

{

printf("Hellow);

}

Answer: 34

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Error: Error is both commas is not written in printf statement.

Question: 35

Trace the output.

Int I = 10

Printf ("%3d",i);

Answer: 35

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Output: i=10

Question: 36

Trace the output.

Float f = 3.14159;

Printf ("f = %4.2f",f);

Answer: 36

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Output: f=3.14

Question: 37

Trace the error in the following code.

#include<stdio.h>

#include<conio.h>

Void main <>

{

float area, r = 2.5;

area = 3.14x are * r;

printf ("Area =%f", area);

getch();

}

Answer: 37

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Erros: Errors is brackets have not been used with Main which are necessary.

Question: 38

Write the output of the following code.

Int x= 9;

X = x%3;

Printf("\n%d is result",x);

Answer: 38

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Output: x = 3

Question: 39

Trace the output :

Void main () {

CharW_1,W_2,W_3;

W_{1 ='A'}

W_{2 ='B'}

W_{3 ='C';}

_{Printf ("%c%c}W_3",W_1,W₂,);

Getch();

}

Answer: 39

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Output:W₃₌Cw₁=Aw₂=B

Question: 40

Trace the output.

Void main() {

Int a, b, temp;

a =10;

b =10;

temp =b;

b = a

a = temp;

Printf ("%d\n",a);

Printf ("%d\n",b);

Getch ( ) ;}

Answer: 40

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Output: a = 20

b = 10

Question: 41

Trace the output .

Int I = 20;

Printf ("%6d",i);

Answer: 41

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Output;

i = 20

Question: 42

What will be the output of the following?

Float t = 3.8961

Printf ("value of t = % 6.2 f" ,t );

Answer: 42

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Output:

t= 3.89

Question: 43

Write the output in the following code.

Int n =-25.41;

Printf ("%6.2f", n);

Answer: 43

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Output: n= - 25.41

Question: 44

Find out the output of the following code.

Int a, b, c;

a =b =c = 6;

a= b;

b= a;

C=2;

Printf("%d%d%d",a,b,c);

Answer: 44

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Output:

6,6,6

Question: 45

Trace the output of the following code.

{

Int x, y, z;

X = 3;

Y = 2;

z = 4;

Printf(%ds%d%d,x+y, y+5, x+z);

Getche();

}

Answer: 45

45-95

Output: 5,7,7

Question: 46

Trace the output.

#include <stdio.h>

Void main (void){

Int x = 10;

Print f (" %d",x %2);

Answer: 46

46-95

Output:

x = 5

Question: 47

Trace the output.

#include <stdio.h>

Void main (void)

{

int x = 1;

int y = 2;

x =x + 1;

y =y+ x ;

printf( "%d\n %d", x, y);

}

Answer: 47

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Output:

x = 2

y = 4

Question: 48

Trace the error in the following code.

#include <stdio.h>

Void main (void)

{ int x= 4

Y =x+10

printf("%d",x+y);

}

Answer: 48

48-95

Errors:

1st errors is terminator is not present in two statements.
2nd error is variable y is not declared properly.

Question: 49

Trace the errors from the following piece of code.

Include <stdio.h>

Void main [ ]

{printf ('Pakistan');

}

Answer: 49

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Errors:

1st error is # sign is not present with include.
2nd error is ( ) small brackets must be used with Main body.

Question: 50

Find the output of the following code.

Int a = 10, b =12;

Int sum =a+b;

Printf("%d",sum);

Answer: 50

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Output:

Sum = 22

Question: 51

Determine the output of the given segment.

inti=212;

Printf ("i = %5d" ,i);

Printf ("i =%3d" ,i);

Answer: 51

51-95

Output:

i 212

i=212

Question: 52

Predict the output of the following code.

Int number = 2;

Number ++;

Printf ("%d",number);

Answer: 52

52-95

Output:

Number = 3

Question: 53

Trace out the errors in the following code.

Int a,

Prin ("%d",a);

Answer: 53

53-95

Errors:

1st error is variable a must be declared with data type char.
2nd error is spelling of printf in print statement is wrong.

Question: 54

What will be the output of the following?

Float f = 3.24;

Printf( "value =%f",f);

Answer: 54

54-95

Output:

f =3.24

Question: 55

Predict the output of the following code.

Int number =6;

Nymber ++;

Printf("%d\n", number);

Answer: 55

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Output:

Number = 7

Question: 56

Write the output of the following code.

Int x =3;

Printf("%d",x);

Printf("%d",x++);

Printf("%d",++x);

Answer: 56

56-95

Output:

x = 3

x = 4

Question: 57

Trace Output:

Void main( )

{

int a, b;

a = 10;

b = 12;

int c= a+b;

printf ("c = %3d",--c);

}

Answer: 57

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Output:

c= 2221

Question: 58

Trace the error of the given code.

Include<stdio.h>

Main()

{int i = 10;

Printf("%d",i) ;}

Answer: 58

58-95

Errors:

Errors is # sign is not present with include.

Question: 59

Trace the errors in the following programs.

Include<stdio.h>

Mian()

{

int a = 10;

printf("%d",a);

}

Answer: 59

59-95

Errors:

1st errors is # sign is not present with include.
2nd error is capital S cannot be used is stdio.h library.

Question: 60

Find the errors in the following piece of code.

#include (stdio.h)

Void Main ()

int a =10;

Printf("%f",a);

Answer: 60

60-95

Errors:

1st errors is Void Main must be written in small letters.
2nd error is in printf statement starting of Printf must be with small letter.

Question: 61

Trace the error.

Int p,q, r;

P = 50000,10

Printf("%d",p);

Answer: 61

61-95

Errors:

1st error is we cannot set two values together to a variable.
2nd error is ;terminator sign has not been used in statement where variable P is declared.

Question: 62

Predict the output of the following.

Float f = 3.14159

Print f (" f = %4.2f" , f);

Answer: 62

62-95

Output:

f =3.14

Question: 63

Trace the output.

Void main () {

Int a, b, n;

N =400;

A = n % 100;

B = n/ 10;

N = n % 10;

Printf ("%d\n",a);

Printf (%d\n"b);

Printf (%d\n"n);

Getch( );}

Answer: 63

63-95

Output:

a = 4

b = 40

n =40

Question: 64

Predict the output of the following code.

Void main ( )

{

Char ch_{1 =}‘A’, ch₂=’B’, ch₃= ‘C’;

Printf (“ch₂\n %c\n ch₁”,ch₃);

Getch ( );

}

Answer: 64

64-95

Output: Ch₂= B

Ch₁= A

Ch₃ = C

Question: 65

Find the output of the following code.

Printf("Book\ t reading\n");

Printf("is a \t very good \n habit");

Answer: 65

65-95

Output:

Book reading

is a very good

habit

Question: 66

Trace the errors from the following.

Void main ( );

{ float I = 15.6;

printf (" %d",i);

}

Answer: 66

66-95

Errors:

Errors is terminator sign has not been used with Main starting.

Question: 67

Define Escape sequence.

Answer: 67

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Escape sequences are characters which are specified in the format string of the printf statement in combination with backslash (\). These cause an escape from the normal interpretation of a string so that the next character is recognized as having special meaning.

Question: 68

Write down output of the following.

Float f = 3.14159;

Printf ("f %4.f",f);

Answer: 68

68-95

Output:

F = 3.14

Question: 69

Write down output of the following piece of code.

Printf( "*\n**\n***);

Answer: 69

69-95

Output:

*

**

***

Question: 70

Find the error:

Void main ( )

{

int a =10;

printf ("%s",b);

}

Answer: 70

70-95

Error:

Error is variable b is not defined which is present in printf statement.

Question: 71

What will be the output from the following code?

Void main ( );

{ int a,b, temp;

a = 10;

b = 20;

temp = a;

a = b;

b = temp;

printf ("a =%d\t b = %d" , a, b);

}

Answer: 71

71-95

Output :

A = 20

B = 10

Question: 72

Find the output of the following code.

Printf( "Programming\t is \n very \t interesting");

Answer: 72

72-95

Output:

Programming is

very interesting

Question: 73

Trace the output of the following.

X = 5;

Y =x++;

Printf ("d%d",x,y);

Answer: 73

73-95

Output:

x = 5

y = 5

Question: 74

Trace the output.

Void main ( ){

Int x,y, z;

X = 10;

Y = 20;

Z = 30;

X = x+ y;

Y = y+ z;

Z = x- y;

Printf("result = %d%d%d\n",x,y,z);

getch();}

Answer: 74

74-95

Output

Result = 30, 50 10

Question: 75

List some input functions in C-Language.

Answer: 75

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Input functions in C-Language:

Getchar ( )
Getch ( )
Gets ( )
Scanf ( )

Question: 76

Trace the error.

Int x = 5;

Int y

Y = x+3

Printf("%d" ,,y );

Answer: 76

76-95

Error:

Error is terminator sign id not present in statements in which variable y is defined and declared.

Question: 77

Find the output of the following code .

Printf ("Pakistan\n is an \n Islamic \ n country");

Answer: 77

77-95

Output:

Pakistan

is

an

Islamic

Country

Question: 78

Trace the output .

Int n =6;

N+ +;

Printf ("%d",n);

Answer: 78

78-95

Output :

n = 7

Question: 79

Define Standard input.

Answer: 79

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Standard Input: Standard input is a steam sata (often text)

Going into a program.The program request data transfers by use of the read operation. Not all programs require stream input.

Example: the dir and Is programs (which displays files names contained in a directory) may take command-line arguments, but perform their operations without stream data input.

Question: 80

Why the ampersand (& )used in scanf is function?

Answer: 80

80-95

Ampersand (& )in scanf function: The ampersand is the address-off operators, In C, if we want to pass parameters by reference the address of (&) operators should be used. The scanf () function reads formatted input and has to put this input into something like a variable .

Question: 81

Predict the output of the following code.

Printf ("*\n**\n***\n****\n");

Answer: 81

81-95

Output:

**

***

****

Question: 82

Describe getch ( ) function.?

Answer: 82

82-95

getch ( ) function: The getch ( ) function is very handy in character manipulation. The getch ( ) function does not accept echo the character typed. This function does not accept any argument.However it returned the typed character to the calling function.

Question: 83

Trace the output of the following code .

Void main ( )

{

printf ("22\t");

printf ("666");

}

Answer: 83

83-95

Output:

22,666

Question: 84

Trace the error in the following code.

Float area , r

Printf (" Enter Radius")

scanf(%f"r);

Answer: 84

84-95

Errors:

1st error no Main body is present
2nd error is : terminator sign is not present in statement where variable is defined.

Question: 85

Trace the output of the following code.

Int i = - 786;

Printf( "%6d",i);

Answer: 85

85-95

Output:

i = -786

Question: 86

What is the use of "scan f" function?Also write its syntax.

Answer: 86

86-95

Scan f Function: In C, the standard input library provides function to perform input and output operations. This input operations are performed by scanf ( ) function. The scanf (pronounced as scan -eff) function is versatile as it is equally good for numeric as well as string input .

Syntax : Here is the syntax of scanf function.

Scanf(format string, &var1,&var2, &var3,....);

Question: 87

Find the error in the code .

#include <STDIO>H>

VOID MAIN( ){

Int a;

A = 20

Printf ("%f",a);

Getch( );}

Answer: 87

87-95

Error:

Error is wrong library has been used in this program.

Question: 88

Explain getch ( ) function .

Answer: 88

88-95

The getch ( ) function is very handy in character manipulation . This function does not accept any argument ,However it returned the typed character to the calling function.

Question: 89

Compare getch and getche functions

Answer: 89

89-95

Getch ( ) function:

Getch function is very handy is character manipulation.
It does not eco the character typed.
It does not accept any arguments.

Question: 90

Write the output of the following code.

Int x, y,z, r;

Printf("Enter three numbers;");

Scanf("%d%d%d", &x,&y, &z);

r =x + y *z ;

Printf( "Enter three numbers :");

Scanf ("%d%d%d", &x,&y,&z);

r = x+y* z;

Printf ("%d",r);

Answer: 90

90-95

Output :

Enter three number 235

r = 17

Question: 91

Find the errors in the following code.

#include <stdio.h>

Void main ()

{

Float area ;r ;

Scanf ("%c"&r);

Area = 3.14*r*r;

Printf ("area = %f"area);

}

Answer: 91

91-95

Error:

Error is the value of variable are is not declared.

Question: 92

Trace the error in the following code.

#include<stdio.h>

Void main( )

{

Inti;

Scanf ("%d",i);

Printf( "%d,i) ;

}

Answer: 92

92-95

Errors:

1st errors is spelling of word main is incorrect.
2nd error is in printf statement closing comma is not present.

Question: 93

Write the output of the following code.

#include <stdio.h>

#include <conio.h>

Void main ( )

{

int x, y,z,;

Printf ("Enter three numbers;")

Scanf ("%d %d %d" ,&x, &y, &z;

Y = x+z;

X =z+ 1;

Scanf("%d %d %d , x, y, z);

Y =x +z;

X =z +1 ;

Scanf ("%d %d %d",x, y,z);

Getch ( );

}

Answer: 93

93-95

Output:

Enter three numbers 2 3 5

x = 6

y = 7

z = 5

Question: 94

Trace out errors in the following code.

Float r;

Clscr ();

Printf ("enter radius);

Scanf ("%f; r);

Answer: 94

94-95

Errors:

Erros is no main body is present.

Question: 95

What is the output of the following ?#include <stdio.h>#include <conio.h>Void main ( ){Inti =5;Printf(%d%d%d",i.i++,++i);getch();}

Answer: 95

95-95

Output: 5,5,6

Computer-science Chapters

12th Class Chapter 10 Computer science Short Questions

0

Perparation Level

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