MCQ.txt

1. Who is the father of C language?
a) Steve Jobs
b) James Gosling
c) Dennis Ritchie
d) Rasmus Lerdorf
 

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
 

11. Which of the following typecasting is accepted by C language?
a) Widening conversions
b) Narrowing conversions
c) Widening & Narrowing conversions
d) None of the mentioned
 

12. Where in C the order of precedence of operators do not exist?
a) Within conditional statements, if, else
b) Within while, do-while
c) Within a macro definition
d) None of the mentioned
 

13. Which of the following is NOT possible with any 2 operators in C?
a) Different precedence, same associativity
b) Different precedence, different associativity
c) Same precedence, different associativity
d) All of the mentioned
 

14. What is an example of iteration in C?
a) for
b) while
c) do-while
d) all of the mentioned
 

15. Functions can return enumeration constants in C?
a) true
b) false
c) depends on the compiler
d) depends on the standard
 

16. Functions in C Language are always _________
a) Internal
b) External
c) Both Internal and External
d) External and Internal are not valid terms for functions
 

17. Which of following is not accepted in C?
a) static a = 10; //static as
b) static int func (int); //parameter as static
c) static static int a; //a static variable prefixed with static
d) all of the mentioned
 

18. Property which allows to produce different executable for different platforms in C is called?
a) File inclusion
b) Selective inclusion
c) Conditional compilation
d) Recursive macros
 

19. What is #include <stdio.h>?
a) Preprocessor directive
b) Inclusion directive
c) File inclusion directive
d) None of the mentioned
 

20. C preprocessors can have compiler specific features.
a) True
b) False
c) Depends on the standard
d) Depends on the platform
 

21. Which of the following are C preprocessors?
a) #ifdef
b) #define
c) #endif
d) all of the mentioned
 

22. The C-preprocessors are specified with _________ symbol.
a) #
b) $
c) ” ”
d) &
 

23. How is search done in #include and #include “somelibrary.h” according to C standard?
a) When former is used, current directory is searched and when latter is used, standard directory is searched
b) When former is used, standard directory is searched and when latter is used, current directory is searched
c) When former is used, search is done in implementation defined manner and when latter is used, current directory is searched
d) For both, search for ‘somelibrary’ is done in implementation-defined places
 

24. How many number of pointer (*) does C have against a pointer variable declaration?
a) 7
b) 127
c) 255
d) No limits
 

25. Which of the following is not possible statically in C language?
a) Jagged Array
b) Rectangular Array
c) Cuboidal Array
d) Multidimensional Array
 

26. Which of the following return-type cannot be used for a function in C?
a) char *
b) struct
c) void
d) none of the mentioned
 

27. The standard header _______ is used for variable list arguments (…) in C.
a) <stdio.h >
b) <stdlib.h>
c) <math.h>
d) <stdarg.h>
 

28. When a C program is started, O.S environment is responsible for opening file and providing pointer for that file?
a) Standard input
b) Standard output
c) Standard error
d) All of the mentioned
 

29. In C language, FILE is of which data type?
a) int
b) char *
c) struct
d) None of the mentioned
 

30. What is the sizeof(char) in a 32-bit C compiler?
a) 1 bit
b) 2 bits
c) 1 Byte
d) 2 Bytes
 

31. Which of the following is not an operator in C?
a) ,
b) sizeof()
c) ~
d) None of the mentioned
 

32. scanf() is a predefined function in______header file.
a) stdlib. h
b) ctype. h
c) stdio. h
d) stdarg. h
 

33. What is meant by ‘a’ in the following C operation?

fp = fopen("Random.txt", "a");
a) Attach
b) Append
c) Apprehend
d) Add
 

34. What will be the output of the following C code?

    #include <stdio.h>
    int main()
    {
        int y = 10000;
        int y = 34;
        printf("Hello World! %d\n", y);
        return 0;
    }
a) Compile time error
b) Hello World! 34
c) Hello World! 1000
d) Hello World! followed by a junk value
 

35. What will happen if the following C code is executed?

    #include <stdio.h>
    int main()
    {
        int main = 3;
        printf("%d", main);
        return 0;
    }
a) It will cause a compile-time error
b) It will cause a run-time error
c) It will run without any error and prints 3
d) It will experience infinite looping
 

36. What will be the output of the following C code?

    #include  <stdio.h>
    int main()
    {
       signed char chr;
       chr = 128;
       printf("%d\n", chr);
       return 0;
    }
a) 128
b) -128
c) Depends on the compiler
d) None of the mentioned
 

37. What will be the output of the following C code on a 64 bit machine?

    #include <stdio.h>
    union Sti
    {
        int nu;
        char m;
    };
    int main()
    {
        union Sti s;
        printf("%d", sizeof(s));
        return 0;
    }
a) 8
b) 5
c) 9
d) 4
 

38. What will be the output of the following C function?

    #include <stdio.h>
    enum birds {SPARROW, PEACOCK, PARROT};
    enum animals {TIGER = 8, LION, RABBIT, ZEBRA};
    int main()
    {
        enum birds m = TIGER;
        int k;
        k = m;
        printf("%d\n", k);
        return 0;
    }
a) 0
b) Compile time error
c) 1
d) 8
 

39. What will be the output of the following C code?

    #include <stdio.h>
    int const print()
    {
        printf("Sanfoundry.com");
        return 0;
    }
    void main()
    {
        print();
    }
a) Error because function name cannot be preceded by const
b) Sanfoundry.com
c) Sanfoundry.com is printed infinite times
d) Blank screen, no output
 

40. Will the following C code compile without any error?

    #include <stdio.h>
    int main()
    {
        for (int k = 0; k < 10; k++);
            return 0;
    }
a) Yes
b) No
c) Depends on the C standard implemented by compilers
d) Error
 

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

    #include <stdio.h>
    void main()
    {
        int x = 5 * 9 / 3 + 9;
    }
a) 3.75
b) Depends on compiler
c) 24
d) 3
 

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

    #include <stdio.h>
    void main()
    {
        float x;
        int y;
        printf("enter two numbers \n", x);
        scanf("%f %f", &x, &y);
        printf("%f, %d", x, y);
    }
a) 7.000000, 7
b) Run time error
c) 7.000000, junk
d) Varies
 

43. What will be the output of the following C code considering the size of a short int is 2, char is 1 and int is 4 bytes?

    #include <stdio.h>
    int main()
    {
        short int i = 20;
        char c = 97;
        printf("%d, %d, %d\n", sizeof(i), sizeof(c), sizeof(c + i));
        return 0;
    }
a) 2, 1, 2
b) 2, 1, 1
c) 2, 1, 4
d) 2, 2, 8
 

44. What is the difference between the following 2 C codes?

    #include <stdio.h> //Program 1
    int main()
    {
        int d, a = 1, b = 2;
        d =  a++ + ++b;
        printf("%d %d %d", d, a, b);
    }
    #include <stdio.h> //Program 2
    int main()
    {
        int d, a = 1, b = 2;
        d =  a++ +++b;
        printf("%d %d %d", d, a, b);
    }
a) No difference as space doesn’t make any difference, values of a, b, d are same in both the case
b) Space does make a difference, values of a, b, d are different
c) Program 1 has syntax error, program 2 is not
d) Program 2 has syntax error, program 1 is not
 

45. What will be the output of the following C code snippet?

    #include <stdio.h>
    void main()
    {
        1 < 2 ? return 1: return 2;
    }
a) returns 1
b) returns 2
c) Varies
d) Compile time error
 

46. What will be the value of the following assignment expression?

 (x = foo())!= 1 considering foo() returns 2
a) 2
b) True
c) 1
d) 0
 

47. What will be the output of the following C function?

    #include <stdio.h>
    void reverse(int i);
    int main()
    {
        reverse(1);
    }
    void reverse(int i)
    {
        if (i > 5)
            return ;
        printf("%d ", i);
        return reverse((i++, i));
    }
a) 1 2 3 4 5
b) Segmentation fault
c) Compilation error
d) Undefined behaviour
 

48. What will be the final values of i and j in the following C code?

    #include <stdio.h>
    int x = 0;
    int main()
    {
        int i = (f() + g()) | g(); //bitwise or
        int j = g() | (f() + g()); //bitwise or
    }
    int f()
    {
        if (x == 0)
            return x + 1;
        else
            return x - 1;
    }
    int g()
    {
        return x++;
    }
a) i value is 1 and j value is 1
b) i value is 0 and j value is 0
c) i value is 1 and j value is undefined
d) i and j value are undefined
 

49. Comment on the following C statement.

   n = 1;
   printf("%d, %dn", 3*n, n++);
a) Output will be 3, 2
b) Output will be 3, 1
c) Output will be 6, 1
d) Output is compiler dependent
 

50. How many times i value is checked in the following C program?

    #include <stdio.h>
    int main()
    {
        int i = 0;
        while (i < 3)
            i++;
        printf("In while loop\n");
    }
a) 2
b) 3
c) 4
d) 1
 

51. What will be the output of the following C code?

     #include <stdio.h>
    int main()
    {
        int i = 0;
        do
        {
            i++;
            if (i == 2)
                continue;
                printf("In while loop ");
        } while (i < 2);
        printf("%d\n", i);
    }
a) In while loop 2
b) In while loop in while loop 3
c) In while loop 3
d) Infinite loop
 

52. What will be the data type returned for the following C function?

    #include <stdio.h>
    int func()
    {
        return (double)(char)5.0;
    }
a) char
b) int
c) double
d) multiple type-casting in return is illegal
 

53. What is the problem in the following C declarations?

   int func(int);
   double func(int);
   int func(float);
a) A function with same name cannot have different signatures
b) A function with same name cannot have different return types
c) A function with same name cannot have different number of parameters
d) All of the mentioned
 

54. Which option should be selected to work the following C expression?

string p = "HELLO";
a) typedef char [] string;
b) typedef char *string;
c) typedef char [] string; and typedef char *string;
d) Such expression cannot be generated in C
 

55. What is the meaning of the following C statement?

 printf(“%10s”, state); 
a) 10 spaces before the string state is printed
b) Print empty spaces if the string state is less than 10 characters
c) Print the last 10 characters of the string
d) None of the mentioned
 

56. What are the elements present in the array of the following C code?

int array[5] = {5};
a) 5, 5, 5, 5, 5
b) 5, 0, 0, 0, 0
c) 5, (garbage), (garbage), (garbage), (garbage)
d) (garbage), (garbage), (garbage), (garbage), 5
 

57. What will be the output of the following C function when EOF returns?

   int fputs(char *line, FILE *fp)
a) ‘�’ character of array line is encountered
b) ‘n’ character in array line is encountered
c) ‘t’ character in array line is encountered
d) When an error occurs
 

58. Which part of the program address space is p stored in the following C code?

    #include <stdio.h>
    int *p;
    int main()
    {
        int i = 0;
        p = &i;
        return 0;
    }
a) Code/text segment
b) Data segment
c) Bss segment
d) Stack