C-online test mcq

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Created on December 02, 2021

C Programming MCQ type Online Test

C Programming Online test, Duration: 80 Mins.

1 / 40

. Which of the following is not a valid C variable name?

int number;

float rate;

int variable_count;

int $main;

2 / 40

The C-preprocessors are specified with _________symbol.

” ”

3 / 40

What is #include ?

Preprocessor directive

Inclusion directive

File inclusion directive

None of the mentioned

4 / 40

scanf() is a predefined function in______header file.

stdlib. h

ctype. h

stdio. h

stdarg. h

5 / 40

Functions can return enumeration constants in C?

true

false

depends on the compiler

depends on the standard

6 / 40

Which of the following declaration is not supported by C language?

String str;

char *str;

float str = 3e2;

Both String str; & float str = 3e2;

7 / 40

Will the following C code compile without any error?

    #include

    int main()

        for (int k = 0; k < 10; k++);

            return 0;

Yes

Depends on the C standard implemented by compilers

Error

8 / 40

Which of the following is a logical AND operator?

None of the above

9 / 40

How many number of pointer (*) does C have against a pointer variable declaration?

127

255

No limits

10 / 40

What will be the output of the following C code? (Initial values: x= 7, y = 8)

    #include

    void main()

        float x;

        int y;

        printf("enter two numbers \n", x);

        scanf("%f %f", &x, &y);

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

7.000000, 7

Run time error

7.000000, junk

Varies

11 / 40

Which of the following is not an operator in C?

sizeof()

None of the mentioned

12 / 40

Which of the following cannot be a variable name in C?

volatile

true

friend

export

13 / 40

Which operator can be used for accessing the value stored at address of a pointer variable?

14 / 40

Which of the following return-type cannot be used for a function in C?

char *

struct

void

none of the mentioned

15 / 40

Which of the following are C preprocessors?

#ifdef

#define

#endif

all of the mentioned

16 / 40

What will be the output of the following C code?

    #include

    int main()

        int y = 10000;

        int y = 34;

        printf("Hello World! %d\n", y);

        return 0;

Compile time error

Hello World! 34

Hello World! 1000

Hello World! followed by a junk value

17 / 40

Which keyword is used to prevent any changes in the variable within a C program?

immutable

mutable

const

volatile

18 / 40

Which header file is used to define input/output functions, macros and prototypes?

memory.h

math.h

dos.h

stdio.h

19 / 40

Which of the following is true for variable names in C?

They can contain alphanumeric characters as well as special characters

It is not an error to declare a variable to be one of the keywords(like goto, static)

Variable names cannot start with a digit

Variable can be of any length

20 / 40

What is the output of below program?

#include

int chk (int, int);

int main()

{

int x;

x = check(10, 20);

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

return 0;

}

int check(int a, int b)

{

int *y, *z;

y=&a;

z=&b;

a>=45 ? return(*y): return(*z);

}

Print 1

Print 10

Print 20

Compile error

21 / 40

What will be the final value of x in the following C code?

    #include

    void main()

        int x = 5 * 9 / 3 + 9;

3.75

Depends on compile

22 / 40

C preprocessors can have compiler specific features.

True

False

Depends on the standard

Depends on the platform

23 / 40

What is the output of below program?

#include

int j;

int function();

int main()

{

while(j)

{

function();

main();

}

printf("Hi\n");

return 0;

}

int function()

{

printf("Hello");

}

Hello

Hi No output

Infinite loop

24 / 40

What is an example of iteration in C?

for

while

do-while

all of the mentioned

25 / 40

Which of the following is true about C Programming?

Platform Independent

High level language

Machine Independent

Assembly language

26 / 40

Which of following is not accepted in C?

static a = 10; //static as

static int func (int); //parameter as static

static static int a; //a static variable prefixed with static

all of the mentioned

27 / 40

What is short int in C programming?

The basic data type of C

Qualifier

Short is the qualifier and int is the basic data type

All of the mentione

28 / 40

All keywords in C are in ____________

LowerCase letters

UpperCase letters

CamelCase letters

None of the mentioned

29 / 40

Who is the father of C language?

Steve Jobs

James Gosling

Dennis Ritchie

Rasmus Lerdorf

30 / 40

What is the sizeof(char) in a 32-bit C compiler?

1 bit

2 bits

1 Byte

2 Bytes

31 / 40

When a C program is started, O.S environment is responsible for opening file and providing pointer for that file?

Standard input

Standard output

Standard error

All of the mentioned

32 / 40

The C compiler used for UNIX operating system is

gcc

vc++

Borland

33 / 40

In a library of C programming language, which of the following header file is used for performing mathematical operations?

conio.h

dos.h

math.h

stdio.h

34 / 40

Which of the following statement is used to free the allocated memory space for a program?

vanish(var-name);

remove(var-name);

erase(var-name);

free(var-name);

35 / 40

Property which allows to produce different executable for different platforms in C is called?

File inclusion

Selective inclusion

Conditional compilation

Recursive macros

36 / 40

Where in C the order of precedence of operators do not exist?

Within conditional statements, if, else

Within while, do-while

Within a macro definition

None of the mentioned

37 / 40

Single line comment in C language begins with _______

38 / 40

Functions in C Language are always _________

Internal

External

Both Internal and External

External and Internal are not valid terms for functions

39 / 40

The statement used for printing \n on the screen is:

printf("");

printf('\n');

printf("\\n");

printf("n\");

40 / 40

What is the result of logical or relational expression in C?

True or False

0 or 1

0 if an expression is false and any positive number if an expression is true

None of the mentioned

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