C/C MCQ Quiz Hub

1. What is the output of this C code? int main() { int i = -5; int k = i %4; printf("%d ", k); }
Compile time error
-1
1
None

2. What is the output of this C code? int main() { int i = 5; int l = i / -4; int k = i % -4; printf("%d %d ", l, k); return 0; }
Compile time error
-1 1
1 -1
Run time error

3. What is the output of this C code? int main() { int i = 7; i = i / 4; printf("%d ", i); return 0; }
Run time error
1
3
Compile time error

4. What is the value of x in this C code? void main() { int x = 4 *5 / 2 + 9; }
6.75
1.85
19
3

5. What is the output of this C code? void main() { int x = 4.3 % 2; printf("Value of x is %d", x); }
Value of x is 1.3
Value of x is 2
Value of x is 0.3
Compile time error

6. What is the output of this C code? void main() { int y = 3; int x = 7 % 4 * 3 / 2; printf("Value of x is %d", x); }
Value of x is 1
Value of x is 2
Value of x is 3
Compile time error

7. What is the output of this C code? void main() { int a = 5; int b = ++a + a++ + --a; printf("Value of b is %d", b); }
Value of x is 16
Value of x is 21
Value of x is 15
Undefined behaviour

8. The precedence of arithmetic operators is (from highest to lowest)?
%, *, /, +, -
%, +, /, *, -
+, -, %, *, /
%, +, -, *, /

9. Which of the following is not an arithmetic operation?
a *= 20;
a /= 30;
a %= 40;
a != 50;

10. Which of the following data type will throw an error on modulus operation(%)?
char
short
float
int

11. What is the output of this C code? int main() { int a = 20; double b = 15.6; int c; c = a + b; printf("%d", c); }
35
36
35.6
30

12. What is the output of this C code? int main() { int a = 20, b = 15, c = 5; int d; d = a == (b + c); printf("%d", d); } A. 1
1
40
10
5

13. What is the output of this C code? void main() { int x = 0; if (x = 0) printf("Its zero "); else printf("Its not zero "); }
ts not zero
Its zero
Run time error
None

14. What is the output of this C code? void main() { int k = 8; int x = 0 == 1 && k++; printf("%d%d ", x, k); }
0 9
0 8
1 9
1 8

15. What is the output of this C code? void main() { char a = 'a'; int x = (a % 10)++; printf("%d ", x); }
6
Junk value
Compile time error
7

16. What is the output of this C code? void main() { 1 < 2 ? return 1: return 2; }
returns 1
returns 2
varies
Compile time error

17. What is the output of this C code? void main() { unsigned int x = -5; printf("%d", x); }
Run time error
Varies
-5
5

18. What is the output of this C code? void main() { unsigned int x = -5; printf("%d", x); }
Run time error
Varies
-5
5

19. What is the output of this C code? int main() { int x = 2, y = 1; x *= x + y; printf("%d ", x); return 0; }
5
6
Undefined behaviour
Compile time error

20. What is the output of this C code? int main() { int x = 2, y = 2; x /= x / y; printf("%d ", x); return 0; }
2
1
0.5
Undefined behaviour

21. What is the type of the below assignment expression if x is of type float, y is of type int? y = x + y;
int
float
There is no type for an assignment expression
double

22. What is the value of the below assignment expression (x = foo())!= 1 considering foo() returns 2
2
True
1
0

23. Operation "a = a * b + a can also be written as:
a *= b + 1
(c = a * b)!=(a = c + a)
a = (b + 1)* a;
All of the mentioned

24. for c = 2, value of c after c <<= 1;
c = 1;
c = 2;
c = 3;
c = 4;

25. What is the output of this C code? int main() { int a = 1, b = 2; a += b -= a; printf("%d %d", a, b); }
1 1
1 2
2 1
2 2

26. What is the output of this C code? int main() { int a = 4, n, i, result = 0; scanf("%d", n); for (i = 0;i < n; i++) result += a; }
Addition of a and n
Subtraction of a and n.
Multiplication of a and n
Division of a and n.

27. Which of the following is an invalid assignment operator?
a %= 10;
a /= 10
a |= 10
None of the mentioned

28. What is the output of this C code? int main() { int c = 2 ^ 3; printf("%d ", c); }
1
8
9
0

29. What is the output of this C code? int main() { unsigned int a = 10; a = ~a; printf("%d ", a); }
-9
-10
-11
10

30. What is the output of this C code? int main() { if (7 & 8) printf("Honesty"); if ((~7 & 0x000f) == 8) printf("is the best policy "); }
Honesty is the best policy
Honesty
is the best policy
No output

31. What is the output of this C code? int main() { int a = 2; if (a >> 1) printf("%d ", a); }
0
1
2
No output

32. What is the output of this C code? int main() { int a = 2; if (a >> 1) printf("%d ", a); }
0
0
1
No output

33. Comment on the output of this C code? int main() { int i, n, a = 4; scanf("%d", &n); for (i = 0; i < n; i++) a = a * 2; }
Logical Shift left
No output
Arithmetic Shift right
bitwise exclusive OR

34. What is the output of this C code? void main() { int x = 97; int y = sizeof(x++); printf("x is %d", x); }
x is 97
x is 98
x is 99
Run time error

35. What is the output of this C code? void main() { int x = 4, y, z; y = --x; z = x--; printf("%d%d%d", x, y, z); }
3 2 3
2 2 3
3 2 2
2 3 3

36. What is the output of this C code? void main() { int x = 4; int *p = &x; int *k = p++; int r = p - k; printf("%d", r); }
4
8
1
Run time error

37. What is the output of this C code? void main() { int a = 5, b = -7, c = 0, d; d = ++a && ++b || ++c; printf(" %d%d%d%d", a, b, c, d); }
6 -6 0 0
6 -5 0 1
-6 -6 0 1
6 -6 0 1

38. What is the output of this C code? void main() { int a = -5; int k = (a++, ++a); printf("%d ", k); }
-3
-5
4
Undefined

39. What is the output of this C code? int main() { int x = 2; x = x << 1; printf("%d ", x);
4
1
Depends on the compiler
Depends on the endianness of the machine

40. What is the output of this C code? int main() { int x = -2; x = x >> 1; printf("%d ", x); }
1
-1
2 ^ 31 "“ 1 considering int to be 4 bytes
Either (b) or (c)

41. What is the output of this C code? int main() { if (~0 == 1) printf("yes "); else printf("no "); }
Yes
No
Compile time error
undefined

42. What is the output of this C code? int main() { int x = -2; if (!0 == 1) printf("yes "); else printf("no "); }
Yes
No
Run time error
undefined

43. What is the output of this C code? int main() { int y = 0; if (1 |(y = 1)) printf("y is %d ", y); else printf("%d ", y); }
1
0
Run time error
undefined

44. What is the output of this C code? int main() { int y = 1; if (y & (y = 2)) printf("true %d "); else printf("false %d "); }
true 2
false 2
Either option a or option b
true 1

45. What is the difference between the following 2 codes? //Program 1 int main() { int d, a = 1, b = 2; d = a++ + ++b; printf("%d %d %d", d, a, b); } //Program 2 int main() { int d, a = 1, b = 2; d = a++ + ++b; printf("%d %d %d", d, a, b); }
No difference as space doesn't make any difference, values of a, b, d are same in both the case
No difference as space doesn't make any difference, values of a, b, d are different
Program 1 has syntax error, program 2 is not
Program 2 has syntax error, program 1 is not

46. What is the output of this C code? int main() { int a = 1, b = 1, c; c = a++ + b; printf("%d, %d", a, b); }
a = 1, b = 1
a = 2, b = 1
a = 1, b = 2
a = 2, b = 2

47. What is the output of this C code? int main() { int a = 1, b = 1, d = 1; printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++); }
15, 4, 5
9, 6, 9
9, 3, 5
6, 4, 6

48. For which of the following, "PI++; code will fail?
#define PI 3.14
char *PI = A";
float PI = 3.14;
Both (A) and (B)

49. What is the output of this C code? int main() { int a = 10, b = 10; if (a = 5) b--; printf("%d, %d", a, b--); }
a = 10, b = 9
a = 10, b = 8
a = 5, b = 9
a = 5, b = 8

50. What is the output of this C code? int main() { int i = 0; int j = i++ + i; printf("%d ", j); }
0
1
2
Compile time error

51. What is the output of this C code? int main() { int i = 2; int j = ++i + i; printf("%d ", j); }
6
5
4
Compile time error

52. Comment on the output of this C code? int main() { int i = 2; int i = i++ + i; printf("%d ", i); }
= operator is not a sequence point
++ operator may return value with or without side effects
it can be evaluated as (i++)+i or i+(++i)
Both a and b

53. What is the output of this C code? int main() { int i = 0; int x = i++, y = ++i; printf("%d % d ", x, y); return 0; }
0, 2
0, 1
1, 2
Undefined

54. What is the output of this C code? int main() { int i = 10; int *p = &i; printf("%d ", *p++); }
10
11
Garbage value
Address of i

55. What is the output of this C code? void main() { int x = 97; int y = sizeof(x++); printf("X is %d", x); }
X is 97
X is 94
X is 99
Run time error

56. What is the output of this C code? void main() { int x = 4, y, z; y = --x; z = x--; printf("%d%d%d", x, y, z); }
3 2 3
2 3 3
3 2 .3
2 3 4

57. What is the output of this C code? void main() { int x = 4; int *p = &x; int *k = p++; int r = p - k; printf("%d", r); }
48
8
1
Run time error

58. What is the output of this C code? void main() { int a = 5, b = -7, c = 0, d; d = ++a && ++b || ++c; printf(" %d%d%d%d", a, b, c, d); }
6 -6 0 0
6 -5 0 1
-6 -6 0 1
6 -6 0 1

59. What is the output of this C code? void main() { int a = -5; int k = (a++, ++a); printf("%d ", k); } A. -4B. -5C. 4D. -3
4
8
1
Run time error

60. What is the output of this C code? void main() { int x = 1, y = 0, z = 5; int a = x && y || z++; printf("%d", z); }
6
5
0
Varies

61. What is the output of this C code? void main() { int x = 1, y = 0, z = 5; int a = x && y && z++; printf("%d", z); }
6
5
0
Varies

62. What is the output of this C code? int main() { int x = 1, y = 0, z = 3; x > y ? printf("%d", z) : return z; }
3
1
Compile time error
Run time error

63. What is the output of this C code? void main() { int x = 1, z = 3; int y = x << 3; printf(" %d ", y); }
-2147483648
-1
Run time error
8

64. What is the output of this C code? void main() { int x = 0, y = 2, z = 3; int a = x & y | z; printf("%d", a); }
3
0
2
Run time error

65. What is the final value of j in the below code? int main() { int i = 0, j = 0; if (i && (j = i + 10)) //do something ; }
0
10
Depends on the compiler
Depends on language standard

66. What is the output of this C code? int main() { int i = 1; if (i++ && (i == 1)) printf("Yes "); else printf("No "); }
Yes
No
Depends on the compiler
Depends on the standard

67. Are logical operators sequence points?
True
False
Depends on the compiler
Depends on the standard

68. Does logical operators in C language are evaluated with short circuit?
True
False
Depends on the compiler
depends on the standard

69. Result of a logical or relational expression in C is?
True or False
0 or 1
0 if expression is false and any positive number if expression is true
None of the mentioned

70. What will be the value of d in the following program? int main() { int a = 10, b = 5, c = 5; int d; d = b + c == a; printf("%d", d); } A
Syntax error
1
5
10

71. What is the output of this C code? int main() { int a = 10, b = 5, c = 3; b != !a; c = !!a; printf("%d %d", b, c); }
5 1
0 3
5 3
1 1

72. Which among the following is NOT a logical or relational operator? A. !=B. ==C. ||D. = Which among the following is NOT a logical or relational operator?
!=
==
||
=

73. What is the output of this C code? int main() { int a = 10; if (a == a--) printf("TRUE 1 "); a = 10; if (a == --a) printf("TRUE 2 "); }
TRUE 1
TRUE 2
TRUE 1 TRUE 2
No output

74. Relational operators cannot be used on:
structure
long
strings
float