MCQOPTIONS
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MCQOPTIONS
This section includes 81 Mcqs, each offering curated multiple-choice questions to sharpen your C Constants knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is the output of this C code? int main() { int var = 010; printf("%d", var); } |
| A. | 2 |
| B. | 8 |
| C. | 9 |
| D. | 10 |
| Answer» C. 9 | |
| 52. |
The library function sqrt operates on a double precision argument. If, i is an integer variable, then which of the following calls would correctly compute sqrt(i)? |
| A. | sqrt((double)i) |
| B. | (double)sqrt(i)? |
| C. | (double)(sqrt(i)) |
| D. | sqrt(i) |
| Answer» B. (double)sqrt(i)? | |
| 53. |
When a variable of data type double is converted into float, then |
| A. | Rounding takes place |
| B. | Truncation takes place |
| C. | The lower order bits are dropped |
| D. | None of these |
| Answer» B. Truncation takes place | |
| 54. |
By default, any real number in 'C' is treated as |
| A. | A float |
| B. | A double |
| C. | A long double |
| D. | Depend upon memory model that you are using |
| Answer» C. A long double | |
| 55. |
To print out a and b given below, which printf() statement would you use? float a = 3.14; double b = 3.14; |
| A. | printf("%f%f",a,b); |
| B. | printf("%Lf%f",a,b); |
| C. | printf("%Lf%Lf",a,b); |
| D. | printf("%f%Lf",a,b); |
| Answer» B. printf("%Lf%f",a,b); | |
| 56. |
The rule for implicit type conversion is |
| A. | int < unsigned < float < double |
| B. | unsigned < int < float < double |
| C. | int < unsigned < double < float |
| D. | unsigned < inc < double < float |
| Answer» B. unsigned < int < float < double | |
| 57. |
What is the correct way to round offx, a float, to an int value? |
| A. | y=(int)(x+0.5) |
| B. | y=int(x+0.5) |
| C. | y=(int)x+0.5 |
| D. | y=(int)(int)x+0.5) |
| Answer» B. y=int(x+0.5) | |
| 58. |
As soon as a pointer variable is freed, its value |
| A. | is set to null |
| B. | becomes unpredictable |
| C. | is set to 1 |
| D. | remains the same |
| Answer» E. | |
| 59. |
In a C program constant is defined |
| A. | before main |
| B. | after main |
| C. | anywhere, but starting on a new line |
| D. | none of the above |
| Answer» D. none of the above | |
| 60. |
The declaration int x : 4; means |
| A. | x is a four digit integer |
| B. | x cannot be greater than a four digit integer |
| C. | x is a four-bit integer |
| D. | none of above |
| Answer» D. none of above | |
| 61. |
Which of the following comments about wide characters is/are true ? |
| A. | it is binary representation of a character in the extended binary set |
| B. | it is of integer type wchar_t |
| C. | end of file is represented by WEOF |
| D. | All of the above |
| Answer» E. | |
| 62. |
Which of the following is true of external variables? |
| A. | they provide a way for two way communication between functions |
| B. | their scope extends from the point of definition through the remainder of the program |
| C. | if they are not initialized, they will be initilised to zero |
| D. | All of the above |
| Answer» E. | |
| 63. |
The value of an automatic variable that is declared but not initialized will be |
| A. | -1 |
| B. | unpredictable |
| C. | none of these |
| Answer» D. | |
| 64. |
Which of the following are true regardless of the implementation ? |
| A. | sizeof(int) is not less than sizeof(long) |
| B. | sizeof(double) is not less than sizeof(float) |
| C. | sizeof (int )equals sizeof(unsigned) |
| D. | both (b) & (c) |
| Answer» E. | |
| 65. |
If a variable can take only integral values from 0 to n. where n is a constant integer, then the variable can be represented as a bit-field whose width is the integral part of (the log in the answers arc to the base 2) |
| A. | log (n) + 1 |
| B. | log (n - 1) + 1 |
| C. | log (n + 1) + 1 |
| D. | none of the above |
| Answer» B. log (n - 1) + 1 | |
| 66. |
What is the output of this C code? #define a 20 int main() { const int a = 50; printf("a = %d n", a); } |
| A. | a = 50 |
| B. | a = 20 |
| C. | Run time error |
| D. | Compilation Error |
| Answer» E. | |
| 67. |
Choose the correct statements |
| A. | enum is a data type. |
| B. | enum feature is an alternative to the define feature |
| C. | In the same enumeration values must be distinct |
| D. | Both (a) and (b) |
| Answer» E. | |
| 68. |
A declaration "short int" is used for variables |
| A. | which have a short duration in a program |
| B. | which have short names |
| C. | which may require less storage than normal integers |
| D. | all of these |
| Answer» D. all of these | |
| 69. |
Comment on the output of this C code? #include void main() { int const k = 5; k++; printf("k is %d", k); } |
| A. | k is 6 |
| B. | Error due to const succeeding int |
| C. | Error, because a constant variable can be changed only twice |
| D. | Error, because a constant variable cannot be changed |
| Answer» E. | |
| 70. |
Which is false? |
| A. | Constant variables need not be defined as they are declared and can be defined later |
| B. | Global constant variables are initialised to zero |
| C. | const keyword is used to define constant values |
| D. | You cannot reassign a value to a constant variable |
| Answer» B. Global constant variables are initialised to zero | |
| 71. |
Comment on the output of this C code? #include void main() { int k = 4; int *const p = &k; int r = 3; p = &r; printf("%d", p); } |
| A. | Address of k |
| B. | Address of r |
| C. | Compile time error |
| D. | Adress of k + address of r |
| Answer» D. Adress of k + address of r | |
| 72. |
What is the output of this C code? #include int main() { const int p; p = 4; printf("p is %d", p); return 0; } |
| A. | p is 4 |
| B. | Compile time error |
| C. | Run time error |
| D. | p is followed by a garbage value |
| Answer» C. Run time error | |
| 73. |
enum types are processed by |
| A. | Compiler |
| B. | Preprocessor |
| C. | Linker |
| D. | Assembler |
| Answer» B. Preprocessor | |
| 74. |
What is the output of this C code? #include #define a 10 int main() { const int a = 5; printf("a = %d n", a); } |
| A. | a = 5 |
| B. | a = 10 |
| C. | Compilation error |
| D. | Runtime error |
| Answer» D. Runtime error | |
| 75. |
What is the output of this C code? #include int main() { enum {ORANGE = 5, MANGO, BANANA = 4, PEACH}; printf("PEACH = %d n", PEACH); } |
| A. | PEACH = 3 |
| B. | PEACH = 4 |
| C. | PEACH = 5 |
| D. | PEACH = 6 |
| Answer» D. PEACH = 6 | |
| 76. |
The declaration enum cities{ bethlehem, jericho, nazareth = 1, jerusalem } assigns the value 1 to |
| A. | bethlehem |
| B. | nazareth |
| C. | bethIehem and nazareth |
| D. | jericho and nazareth |
| Answer» E. | |
| 77. |
The statement printf( " % f ", ( float )9/5) ; prints |
| A. | 1.8 |
| B. | 1.0 |
| C. | 2.0 |
| D. | none of these |
| Answer» B. 1.0 | |
| 78. |
What are the parts of the literal constants? |
| A. | integer numerals |
| B. | floating-point numerals |
| C. | strings and boolean values |
| D. | all of the mentioned |
| Answer» E. | |
| 79. |
The constants are also called as _____________ |
| A. | const |
| B. | preprocessor |
| C. | literals |
| D. | variables |
| Answer» D. variables | |
| 80. |
------not a secondry constant. |
| A. | Character |
| B. | Array |
| C. | Pointer Structure |
| D. | Union |
| Answer» B. Array | |
| 81. |
We cannot use the way to declare the constant. |
| A. | const int a = 1; |
| B. | int const a = 1; |
| C. | int constant a=1 |
| D. | none |
| Answer» D. none | |