Arrays Questions and Answers

Q: Choose the correct statements

Correct answer: Both (a) & (b)(a) An entire array is passed simply by naming it, which hands over its base address. (b) A part can be passed just as easily, by passing the address of an interior element - f(&a[3], n) gives the function the tail of the array. (c) is false: since the function holds the caller’s address, changes it makes are not local - they are visible to the caller.

Q: Pick the correct answers if x is an one dimensional array, then

Correct answer: both (b) & (c)(c) is the definition of subscripting: x[i] is *(x + i). (b) follows from it - &x[i] is x + i, so dereferencing it gives the same element back. (a) is false: &x[i] equals x + i, not x + i - 1, which would be the previous element.

Q: Choose the correct statements

Correct answer: All of the aboveAll three are true. An array holds one type. An array may be a member of a structure, as a fixed-length name field commonly is. And an array of structures is entirely ordinary - a table of records is exactly that.

Q: A file is preferable to an array of structures because

Correct answer: All of the aboveAll three reasons hold. A file persists after the program that wrote it ends, while an array vanishes with the process. A file need not be sized in advance, so no space is reserved and wasted. And the operating system provides tools - copy, search, sort, back up - that work on files and not on a program’s memory.

Q: Consider the declaration char street[10] = "abcdefghi"; Choose the correct remark(s)

Correct answer: None of the aboveAll three remarks are false.&street and street hold the same address - the start of the array - and differ only in type.&street is perfectly meaningful: it has type char (*)[10].Because of that type, &street + 1 advances 10 bytes while street + 1 advances 1, so the two differ.

121.

Choose the correct statements

A.an entire array can be passed as an argument to a function
B.a part of an array can be passed as argument to a function
C.any change done to an array that is passed as an argument to a function will be local to the function
D.Both (a) & (b)

Answer: D

Correct answer: Both (a) & (b)

(a) An entire array is passed simply by naming it, which hands over its base address. (b) A part can be passed just as easily, by passing the address of an interior element - f(&a[3], n) gives the function the tail of the array. (c) is false: since the function holds the caller’s address, changes it makes are not local - they are visible to the caller.

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122.

Pick the correct answers
if x is an one dimensional array, then

A.&x[ i ] is same as x + i - 1
B.*(x + i) is same as *(&x[i])
C.*(x + i) is same as x[ i ]
D.both (b) & (c)

Answer: D

Correct answer: both (b) & (c)

(c) is the definition of subscripting: x[i] is *(x + i). (b) follows from it - &x[i] is x + i, so dereferencing it gives the same element back. (a) is false: &x[i] equals x + i, not x + i - 1, which would be the previous element.

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123.

Choose the correct statements

A.Array stores data of the same type
B.Array can be a part of a structure
C.Array of structure is allowed
D.All of the above

Answer: D

Correct answer: All of the above

All three are true. An array holds one type. An array may be a member of a structure, as a fixed-length name field commonly is. And an array of structures is entirely ordinary - a table of records is exactly that.

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124.

A file is preferable to an array of structures because

A.file lives even after the program that created it terminates
B.memory space will not be wasted
C.there are many system tools to manipulate files
D.All of the above

Answer: D

Correct answer: All of the above

All three reasons hold. A file persists after the program that wrote it ends, while an array vanishes with the process. A file need not be sized in advance, so no space is reserved and wasted. And the operating system provides tools - copy, search, sort, back up - that work on files and not on a program’s memory.

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125.

Consider the declaration

char street[10] = "abcdefghi";

Choose the correct remark(s)

A.&street and street will have different values
B.&street is meaningless
C.&street+1 and street+1 will have the same values
D.None of the above

Answer: D

Correct answer: None of the above

All three remarks are false.

&street and street hold the same address - the start of the array - and differ only in type.
&street is perfectly meaningful: it has type char (*)[10].
Because of that type, &street + 1 advances 10 bytes while street + 1 advances 1, so the two differ.

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