100 MCQ Questions of C++ (Variables, Data Type & Operator) || Programming || Computer Technology || Edu Verse BY Pratik || Code With Pratik

C++ Multiple Choice Questions

1. What is the result of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 7;
    int b = 2;
    cout << a % b << endl;
    return 0;
}
        

A) 7 B) 1 C) 2 D) Error

Answer: B) 1

2. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    float a = 3.5;
    int b = 2;
    cout << a / b << endl;
    return 0;
}
        

A) 1.75 B) 1 C) 2 D) Error

Answer: A) 1.75

3. Which of the following statements about data types is true?

A) `char` can store integers B) `int` can store floating-point numbers C) `float` can store only whole numbers D) `double` is less precise than `float`

Answer: A) `char` can store integers

4. What will the following code output?

#include <iostream>
using namespace std;

int main() {
    bool flag = true;
    cout << !flag << endl;
    return 0;
}
        

A) 0 B) 1 C) true D) false

Answer: A) 0

5. What is the result of the following expression?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    x += 10;
    cout << x << endl;
    return 0;
}
        

A) 15 B) 10 C) 5 D) Error

Answer: A) 15

6. Which operator is used to perform the bitwise OR operation in C++?

A) | B) || C) & D) ^

Answer: A) |

7. What is the output of this code?

#include <iostream>
using namespace std;

int main() {
    int x = 7;
    cout << ++x << endl;
    return 0;
}
        

A) 8 B) 7 C) 6 D) Error

Answer: A) 8

8. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    char ch = 'B';
    cout << ch + 1 << endl;
    return 0;
}
        

A) C B) B C) 66 D) 67

Answer: A) C

9. Which operator is used for logical AND in C++?

A) & B) && C) | D) ||

Answer: B) &&

10. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    x *= 3;
    cout << x << endl;
    return 0;
}
        

A) 30 B) 10 C) 20 D) Error

Answer: A) 30

11. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    cout << x-- << endl;
    return 0;
}
        

A) 10 B) 9 C) 11 D) Error

Answer: A) 10

12. What is the result of this expression?

#include <iostream>
using namespace std;

int main() {
    float x = 7.0;
    int y = 3;
    cout << x / y << endl;
    return 0;
}
        

A) 2.3333 B) 2 C) 2.0 D) Error

Answer: A) 2.3333

13. Which operator is used for bitwise XOR operation in C++?

A) ^ B) & C) | D) &&

Answer: A) ^

14. What will the following code output?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 4;
    cout << a + b * 2 << endl;
    return 0;
}
        

A) 13 B) 14 C) 9 D) 10

Answer: A) 13

15. What will be the output of this code?

#include <iostream>
using namespace std;

int main() {
    float a = 2.5;
    int b = 4;
    cout << a * b << endl;
    return 0;
}
        

A) 10 B) 10.0 C) 2.5 D) 2.0

Answer: A) 10.0

16. Which of the following is a correct way to declare a `short` integer variable in C++?

A) short int x; B) short x; C) int short x; D) short x = 10;

Answer: A) short int x;

17. What will be the output of this code?

#include <iostream>
using namespace std;

int main() {
    int x = 3;
    int y = 5;
    cout << (x + y) * (x - y) << endl;
    return 0;
}
        

A) -16 B) -10 C) 16 D) 0

Answer: A) -16

18. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    char ch = 'Z';
    cout << ++ch << endl;
    return 0;
}
        

A) [ B) Y C) Z D) Error

Answer: A) [

19. Which of the following is used for modulo division in C++?

A) % B) / C) & D) \\

Answer: A) %

20. What will the following code print?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    int y = 4;
    cout << x % y << endl;
    return 0;
}
        

A) 1 B) 2 C) 4 D) 0

Answer: A) 1

21. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 8;
    int b = 3;
    cout << a / b << endl;
    return 0;
}
    

A) 2 B) 2.666 C) 3 D) 0

Answer: A) 2

22. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 4;
    int y = 5;
    cout << (x + y) * 2 << endl;
    return 0;
}
    

A) 18 B) 20 C) 9 D) 14

Answer: A) 18

23. What is the result of the following operation: 10 % 3 in C++?

A) 1 B) 2 C) 3 D) 10

Answer: B) 1

24. Which of the following statements is true about the `char` data type in C++?

A) It is used to represent a single character. B) It is used to represent a floating-point number. C) It is used to represent an integer value. D) It is used to represent a boolean value.

Answer: A) It is used to represent a single character.

25. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    int y = x++;
    cout << y << endl;
    cout << x << endl;
    return 0;
}
    

A) 10 11 B) 11 10 C) 10 10 D) 11 11

Answer: A) 10 11

26. What is the result of the following operation: 5 * 2 >> 1 in C++?

A) 5 B) 10 C) 20 D) 25

Answer: B) 10

27. Which of the following is a correct statement about the `++` operator in C++?

A) It increments the value of a variable by 1. B) It decrements the value of a variable by 1. C) It multiplies the value of a variable by 1. D) It divides the value of a variable by 1.

Answer: A) It increments the value of a variable by 1.

28. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 4;
    int y = 3;
    cout << x * y << endl;
    return 0;
}
    

A) 7 B) 12 C) 10 D) 15

Answer: B) 12

29. Which of the following is the correct syntax to declare a variable `x` of type `float`?

A) float x; B) float x = 0; C) float x = 1.0; D) All of the above

Answer: D) All of the above

30. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 7;
    int y = 3;
    cout << (x % y) + 1 << endl;
    return 0;
}
    

A) 2 B) 3 C) 1 D) 4

31. What is the size of `int` on a typical 32-bit system?

A) 2 bytes B) 4 bytes C) 8 bytes D) 1 byte

Answer: B) 4 bytes

32. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    float a = 1.2f;
    double b = 1.2;
    cout << (a == b) << endl;
    return 0;
}
    

A) 0 B) 1 C) Compilation error D) Undefined behavior

Answer: A) 0

33. Which of the following is a valid way to declare a variable in C++?

A) int 1number; B) float number; C) double number = 3.14f; D) char number;

Answer: B) float number;

34. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    cout << ++x << endl;
    return 0;
}
    

A) 10 B) 11 C) 9 D) Compilation error

Answer: B) 11

35. Which operator is used to perform integer division in C++?

A) / B) % C) // D) div

Answer: A) /

36. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 8;
    cout << x / 3 << endl;
    return 0;
}
    

A) 2.66667 B) 2 C) 3 D) 2.666

Answer: B) 2

37. Which of the following is the correct syntax to declare a constant variable in C++?

A) const int x = 10; B) constant int x = 10; C) int const x = 10; D) Both A and C

Answer: D) Both A and C

38. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 7;
    int b = 3;
    cout << a % b << endl;
    return 0;
}
    

A) 1 B) 2 C) 3 D) 4

Answer: A) 1

39. What is the result of `5 + 3 * 2` in C++?

A) 16 B) 11 C) 10 D) 13

Answer: B) 11

40. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 15;
    cout << a / 4 << endl;
    return 0;
}
    

A) 3 B) 3.75 C) 4 D) 3.0

Answer: A) 3

41. What is the size of `char` in C++?

A) 1 byte B) 2 bytes C) 4 bytes D) Depends on the system

Answer: A) 1 byte

42. Which of the following data types can store floating-point numbers in C++?

A) int B) char C) float D) bool

Answer: C) float

43. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 2;
    int b = 3;
    cout << a++ * ++b << endl;
    return 0;
}
    

A) 6 B) 7 C) 8 D) 5

Answer: A) 6

44. Which operator is used to compare two values in C++?

A) = B) == C) != D) <=

Answer: B) ==

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

#include <iostream>
using namespace std;

int main() {
    bool flag = true;
    cout << !flag << endl;
    return 0;
}
    

A) true B) false C) 0 D) 1

Answer: B) false

46. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 9;
    cout << x % 4 << endl;
    return 0;
}
    

A) 1 B) 2 C) 3 D) 0

Answer: A) 1

47. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    int y = x++;
    cout << y << endl;
    return 0;
}
    

A) 5 B) 6 C) 4 D) Compilation error

Answer: A) 5

48. Which data type is used to store a single character in C++?

A) int B) float C) char D) bool

Answer: C) char

49. What is the result of `10 / 3` in C++ when `10` and `3` are integers?

A) 3 B) 3.333 C) 3.0 D) 3.3333

Answer: A) 3

50. What is the correct syntax for declaring a `double` variable in C++?

A) double num; B) num double; C) float num; D) decimal num;

Answer: A) double num;

51. Which of the following is not a valid data type in C++?

A) int B) long C) real D) bool

Answer: C) real

52. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 10;
    cout << a + b * 2 << endl;
    return 0;
}
    

A) 20 B) 25 C) 30 D) 15

Answer: C) 25

53. What is the correct way to declare a variable `score` of type `int` and initialize it to 100?

A) int score = 100; B) int score 100; C) score int = 100; D) int 100 = score;

Answer: A) int score = 100;

54. Which of the following is used to perform logical AND operation in C++?

A) && B) || C) & D) |

Answer: A) &&

55. What is the result of `7 % 3` in C++?

A) 2 B) 1 C) 0 D) 3

Answer: A) 1

56. What is the correct syntax for a `for` loop in C++?

A) for (int i = 0; i < 10; i++) { /* code */ } B) for int i = 0; i < 10; i++ { /* code */ } C) for (i = 0; i < 10; i++) { /* code */ } D) for (int i = 0; i < 10; i++) { code; }

Answer: A) for (int i = 0; i < 10; i++) { /* code */ }

57. Which of the following data types is used for boolean values in C++?

A) bool B) boolean C) bools D) bit

Answer: A) bool

58. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 2;
    int y = 4;
    cout << x * y / 2 << endl;
    return 0;
}
    

A) 4 B) 6 C) 8 D) 2

Answer: A) 4

59. What is the correct way to declare a variable `price` of type `float`?

A) float price; B) float price = 0.0; C) price float; D) Both A and B

Answer: D) Both A and B

60. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 10;
    cout << a-- << endl;
    return 0;
}
    

A) 10 B) 9 C) 11 D) Compilation error

Answer: A) 10

61. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 8;
    int b = 3;
    cout << a / b << endl;
    return 0;
}
    

A) 2 B) 2.67 C) 3 D) 3.0

Answer: A) 2

62. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    double a = 5.5;
    int b = 2;
    cout << a / b << endl;
    return 0;
}
    

A) 2.75 B) 2 C) 2.0 D) 2.7

Answer: A) 2.75

63. What is the size of a `long long` variable on most systems?

A) 4 bytes B) 8 bytes C) 2 bytes D) 16 bytes

Answer: B) 8 bytes

64. Which of the following is the correct syntax for using a `switch` statement in C++?

A) switch (expression) { case value: /* code */ break; } B) switch { expression case value: /* code */ break; } C) switch (expression) { case value: /* code */ } break; D) switch (expression) { if (value) { /* code */ } }

Answer: A) switch (expression) { case value: /* code */ break; }

65. Which of the following data types has the largest size in C++?

A) int B) long C) float D) long long

Answer: D) long long

66. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 3;
    int b = 2;
    cout << a / b << endl;
    cout << a % b << endl;
    return 0;
}
    

A) 1 1 B) 1 0 C) 1 1 D) 1 2

Answer: A) 1 1

67. Which of the following is a valid floating-point literal in C++?

A) 3.14 B) 3,14 C) 3.14f D) Both A and C

Answer: D) Both A and C

68. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 1;
    int b = 2;
    cout << a + b * 2 << endl;
    return 0;
}
    

A) 5 B) 6 C) 4 D) 3

Answer: A) 5

69. Which of the following is the correct way to declare an array of 5 integers in C++?

A) int arr[5]; B) int arr(5); C) int arr = [5]; D) int arr{5};

Answer: A) int arr[5];

70. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 3;
    int b = 4;
    cout << ++a + b++ << endl;
    return 0;
}
    

A) 8 B) 7 C) 9 D) 6

Answer: A) 8

71. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 10;
    cout << (a < b ? a : b) << endl;
    return 0;
}
    

A) 10 B) 5 C) 0 D) Compilation error

Answer: B) 5

72. Which of the following statements is true about `unsigned int`?

A) It can store only positive numbers. B) It can store negative numbers. C) It can store both positive and negative numbers. D) It is the same as `int`.

Answer: A) It can store only positive numbers.

73. What is the size of a `short` variable on most systems?

A) 2 bytes B) 4 bytes C) 8 bytes D) 16 bytes

Answer: A) 2 bytes

74. Which operator is used to access members of a structure in C++?

A) . B) -> C) & D) %

Answer: A) .

75. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    x *= 3;
    cout << x << endl;
    return 0;
}
    

A) 15 B) 8 C) 5 D) 20

Answer: A) 15

76. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 10;
    cout << (a > b) << endl;
    return 0;
}
    

A) 0 B) 1 C) 10 D) 5

Answer: A) 0

77. Which of the following is a correct statement about `const` variables in C++?

A) Their value cannot be changed once initialized. B) They can be modified later in the code. C) They are always initialized to zero. D) They can only be used with classes.

Answer: A) Their value cannot be changed once initialized.

78. What is the default value of a `bool` variable in C++ if not explicitly initialized?

A) false B) true C) 0 D) 1

Answer: A) false

79. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 7;
    cout << (x % 3 == 1) << endl;
    return 0;
}
    

A) 1 B) 0 C) 7 D) Compilation error

Answer: A) 1

80. Which operator is used for equality comparison in C++?

A) == B) = C) < D) >

Answer: A) ==

81. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 10;
    cout << a++ << endl;
    cout << a << endl;
    return 0;
}
    

A) 10 11 B) 11 10 C) 11 11 D) 10 10

Answer: A) 10 11

82. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 4;
    int y = 5;
    cout << x > y ? x : y << endl;
    return 0;
}
    

A) 4 B) 5 C) Compilation error D) 0

Answer: B) 5

83. Which of the following is a valid integer literal in C++?

A) 123 B) 0x1F C) 0123 D) All of the above

Answer: D) All of the above

84. What is the result of the following operation: 7 & 3 in C++?

A) 1 B) 7 C) 3 D) 0

Answer: A) 3

85. Which of the following operators has the highest precedence in C++?

A) * (multiplication) B) + (addition) C) & (bitwise AND) D) / (division)

Answer: A) * (multiplication)

86. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    cout << x-- << endl;
    cout << x << endl;
    return 0;
}
    

A) 10 9 B) 9 10 C) 10 10 D) 9 9

Answer: A) 10 9

87. What is the result of the operation 5 ^ 3 in C++?

A) 6 B) 1 C) 7 D) 8

Answer: A) 6

88. What is the result of the operation 5 << 1 in C++?

A) 10 B) 5 C) 7 D) 3

Answer: A) 10

89. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    bool flag = true;
    cout << !flag << endl;
    return 0;
}
    

A) 0 B) 1 C) true D) false

Answer: A) 0

90. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    x += 10;
    cout << x << endl;
    return 0;
}
    

A) 15 B) 10 C) 5 D) 20

Answer: A) 15

91. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 5;
    cout << (a == b) << endl;
    return 0;
}
    

A) 1 B) 0 C) true D) false

Answer: A) 1

92. Which of the following is a correct statement about the `sizeof` operator in C++?

A) It returns the size of a variable in bytes. B) It returns the size of a variable in bits. C) It returns the size of a variable in kilobytes. D) It returns the size of a variable in megabytes.

Answer: A) It returns the size of a variable in bytes.

93. What is the size of an `int` variable on most systems?

A) 2 bytes B) 4 bytes C) 8 bytes D) 16 bytes

Answer: B) 4 bytes

94. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    int y = 20;
    cout << (x > y ? x : y) << endl;
    return 0;
}
    

A) 10 B) 20 C) 0 D) Compilation error

Answer: B) 20

95. Which of the following is a correct statement about `float` in C++?

A) It is used to represent floating-point numbers. B) It is used to represent integer values. C) It is used to represent characters. D) It is used to represent boolean values.

Answer: A) It is used to represent floating-point numbers.

96. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 7;
    x /= 2;
    cout << x << endl;
    return 0;
}
    

A) 3 B) 3.5 C) 4 D) 0

Answer: A) 3

97. What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 2;
    cout << (a % b) << endl;
    return 0;
}
    

A) 1 B) 2 C) 3 D) 0

Answer: A) 1

98. What is the result of the operation 3 * 2 > 5 in C++?

A) true B) false C) 1 D) 0

Answer: A) true

99. Which of the following operators has the lowest precedence in C++?

A) + (addition) B) * (multiplication) C) / (division) D) & (bitwise AND)

Answer: D) & (bitwise AND)

100. What is the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 10;
    x += 5;
    x -= 3;
    cout << x << endl;
    return 0;
}
    

A) 12 B) 13 C) 10 D) 8

Answer: B) 13

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