Top 100 Important MCQ's With Answer From C Programming BCAC-101

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1 . The Founder of C Programing language is?

a)       Danis Ritchie 

b)      Mark Zuckerberg 

c)        Charls Babej

d)       Bill Gates 

Click To See Answer

Ans: a) Danis Ritchie 

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

a) int number;

b) float rate;

c) int variable_count;

d) int $main;

3. All keywords in C are in ____

a) LowerCase letters

b) UpperCase letters

c) CamelCase letters

d) None of the mentioned

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

a) They can contain alphanumeric characters as well as special characters

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

c) Variable names cannot start with a digit

d) Variable can be of any length

5. Which is valid C expression?

a) int my_num = 100,000;

b) int my_num = 100000;

c) int my num = 1000;

d) int $my_num = 10000;

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

a) volatile

b) true

c) friend

d) export

7. What is short int in C programming?

a) The basic data type of C

b) Qualifier

c) Short is the qualifier and int is the basic data type

d) All of the mentioned

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

a) String str;

b) char *str;

c) float str = 3e2;

d) Both String str; & float str = 3e2;

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

a) immutable

b) mutable

c) const

d) volatile

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

a) True or False

b) 0 or 1

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

d) None of the mentioned

1.Who is father of C Language?

A. jarne Stroustrup

B. James Gosling

C. Dennis Ritchie

D. Dr. E.F. Codd

2. C language developed at _____?

A. AT & T's Bell Laboratories of USA in 1972

B. AT & T's Bell Laboratories of USA in 1970

C. Sun Microsystems in 1973

D. Cambridge University in 1972

3. For 16-bit compiler allowable range for integer constants is ____?

A.-3.4e38 to 3.4e38   

B.-32767 to 32768

C.-32668 to 32667

D.-32768 to 32767

4. C programs are converted into machine language with the help of

A. An Editor

B. A compiler

C. An operating system

D. None of these.

5. C was primarily developed as

A. System programming language

B. General purpose language

C. Data processing language

D. None of the above.

6. Standard ANSI C recognizes __ number of keywords?

A. 30                      B. 32

C. 24                      D. 36

7. A C variable cannot start with

A. A number

B. A special symbol other than underscore

C. Both of the above

D. An alphabet

8. Low level language is .?

a) Human readable like language.

b) language with big program size.

c) language with small program size.

d) Difficult to understand and readability is questionable.

9. High level language is a .?

a) Human readable like language.

b) language with big program size.

c) language with small program size.

d) language which is difficult to understand and not human readable.

10. C is ___ type of programming language.?

a) Object Oriented                          b) Procedural

c) Bit level language                        d) Functional

1) What is the 16-bit compiler allowable range for integer constants?

A) -3.4e38 to 3.4e38                        B) -32767 to 32768

C) -32768 to 32767                           D) -32668 to 32667        

2. What will be the output of this program?

main() 

{printf("javatpoint"); 

main();}

1. Wrong statement                                            B. It will keep on printing javatpoint

3. It will Print javatpoint once                          D. None of the these

3. What is required in each C program?

A.      The program must have at least one function

B.      The program does not require any function

C.      Input data                   D.  Output data

4.Which of the following comment is correct when a macro definition includes arguments?

1. The opening parenthesis should immediately follow the macro name.
2. There should be at least one blank between the macro name and the opening parenthesis.
3. There should be only one blank between the macro name and the opening parenthesis.
4. All the above comments are correct

5. What is a lint?

A.      C compiler                   B.  Interactive debugger.

C.  Analyzing tool     D.  C interpreter

6. What is the output of this statement "printf("%d", (a++))"?

A.  The value of (a + 1)

B.      The current value of a

C.      Error message

D.      Garbage

E.       7. Why is a macro used in place of a function?

1. It reduces execution time.
2. It reduces code size.
3. It increases execution time.
4. It increases code size.

8. In the C language, the constant is defined ___.

1. Before main
2. After main
3. Anywhere, but starting on a new line.
4. None of the these.

9.Which one of the following is a loop construct that will always be executed once?

1. For                         B. while

C. switch                      D. do while

10.Which of the following best describes the ordering of destructor calls for stack-resident objects in a routine?

1. The first object created is the first object destroyed; last created is last destroyed.
2. The first object destroyed is the last object destroyed; last created is first destroyed.
3. Objects are destroyed in the order they appear in memory, the object with the lowest memory address is destroyed first.
4. The order is undefined and may vary from compiler to compiler.

11. Which of the following special symbol allowed in a variable name?

A.* (asterisk)                                     B.| (pipeline)

C.- (hyphen)                                       D. _ (underscore)

 

2. How would you round off a value from 1.66 to 2.0?

A.ceil(1.66)

B.floor(1.66)

C.roundup(1.66)

D.roundto(1.66)

3. By default a real number is treated as a

A. float

B. double

C. long double

D. far double

 

4. When we mention the prototype of a function?

A.                   Defining

B. Declaring

C. Prototyping

D. Calling

5. Which of the following correctly shows the hierarchy of arithmetic operations in C?

A.  / + * -                                              B.  * - / +

 

C.  + - / *                                              D.  / * + -

 

6. Can you combine the following two statements into one?

char p; p = (char) malloc(100);

A.                   char p = *malloc(100);

B.                   char *p = (char) malloc(100);

C.                   char p = (char)malloc(100);

D.                   char p = (char *)(malloc)(100);

 

7. In which header file is the NULL macro defined?

A.stdio.h

B.stddef.h

C.stdio.h and stddef.h

D.math.h

 

8. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

A..                                          B.&

C.*                                         D.->

 

9. A pointer is

A.A keyword used to create variables

B.A variable that stores address of an instruction

C.A variable that stores address of other variable

D.All of the above

 

10. The operator used to get value at address stored in a pointer variable is

A.*                                         B.&

C.&&                                     D.||

 

11. The keyword used to transfer control from a function back to the calling function is

A.switch                               B.goto

C.go back                             D.return

 

12. Which of the following function sets first n characters of a string to a given character?

A.strinit()                                             B.strnset()

C.strset()                                             D.strcset()

 

13. If the two strings are identical, then strcmp() function returns

A.-1                                                        B.1

C.0                                                          D.Yes

 

14. The library function used to find the last occurrence of a character in a string is

A.strnstr()                                           B.laststr()

C.strrchr()                                            D.strstr()

 

15. Which of the following function is used to find the first occurrence of a given string in another string?

A.strchr()                             B.strrchr()

C.strstr()                              D.strnset()

 

16. Which of the following function is more appropriate for reading in a multi-word string?

A.printf();                            B.scanf();

C.gets();                               D.puts();

 

17. What is the purpose of "rb" in fopen() function used below in the code?

FILE *fp; fp = fopen("source.txt", "rb");

A.open "source.txt" in binary mode for reading

B.open "source.txt" in binary mode for reading and writing

C.Create a new file "source.txt" for reading and writing

D.None of above

 

18. What does fp point to in the program ?

#include<stdio.h>

int main()

{

 FILE *fp;

fp=fopen("trial", "r");

return 0;

}

A.The first character in the file

B.A structure which contains a char pointer which points to the first character of a file.

C.The name of the file.                                   D.The last character in the file.

 

19. Which of the following operations can be performed on the file "NOTES.TXT" using the below code?

FILE *fp; fp = fopen("NOTES.TXT", "r+");

A.                   Reading                         B.            Writing

C.                   Appending                   D.            Read and Write

 

20. Out of fgets() and gets() which function is safe to use

A.                   gets()

B.                   fgets()

                                   Answer

1=d

 

 

1. While calling the fprintf() function in the format string conversion specifier %s can be used to write a character string in capital letters.

A.True

B.False

 

2. A text stream is an ordered sequence of characters composed into lines, each line consisting of zero or more characters plus a terminating new-line character.

A.True

B.False

 

3. Offset used in fseek() function call can be a negative number.

A.True

B.False

 

4. We should not read after a write to a file without an intervening call to fflush(), fseek() or rewind()

A.                   True

B.                   False

 

5. In a call to printf() function the format specifier %b can be used to print binary equivalent of an integer.

A.True

B.False

 

6. stderr, stdin, stdout are FILE pointers

A.Yes

B.No

 

7. A file written in text mode can be read back in binary mode.

A.Yes

B.No

 

8. Can we specify a variable filed with in a scanf() format string?

A.Yes

B.No

 

9. Which of the following statement is correct about the program?

#include<stdio.h>

int main()

{

FILE *fp;

char ch;

int i=1;

fp = fopen("myfile.c", "r");

while((ch=getc(fp))!=EOF)

 {

if(ch == '\n')

i++;

}

printf("%d",i);

fclose(fp);

return 0;

}

A.                   The code counts number of characters in the file

B.                   The code counts number of words in the file

C.                   The code counts number of blank lines in the file

D.                   The code counts number of lines in the file

 

10. Which of the following statement is correct about the program?

#include<stdio.h>

int main()

{

FILE *fp;

char str[11], ch;

int i=0;

fp = fopen("INPUT.TXT", "r"); while((ch=getc(fp))!=EOF)

{

 if(ch == '\n' || ch == ' ')

 {

str[i]='\0'; strrev(str);

printf("%s", str);

i=0;

 }

else

str[i++]=ch;

 }

fclose(fp);

return 0;

}

A.The code writes a text to a file

B.The code reads a text files and display its content in reverse order

C.The code writes a text to a file in reverse order

D.None of above

 

11. Point out the correct statements about the program?

#include<stdio.h>

#include<string.h>

int main() {

FILE *fptr;

char str[80];

fptr = fopen("f1.dat", "w");

if(fptr == NULL)

printf("Cannot open file");

else

{

while(strlen(gets(str))>0)

{

fputs(str, fptr);

fputs("\n", fptr);

}

fclose(fptr);

}

return 0;

}

A.The code copies the content of one file to another

B.The code writes strings that are read from the keyboard into a file.

C.The code reads a file

D.None of above

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