C Programming - Arrays - Discussion
Discussion Forum : Arrays - Point Out Correct Statements (Q.No. 5)
5.
Which of the following statements are correct about an array?
| 1: | The array int num[26]; can store 26 elements. |
| 2: | The expression num[1] designates the very first element in the array. |
| 3: | It is necessary to initialize the array at the time of declaration. |
| 4: | The declaration num[SIZE] is allowed if SIZE is a macro. |
Answer: Option
Explanation:
1. The array int num[26]; can store 26 elements. This statement is true.
2. The expression num[1] designates the very first element in the array. This statement is false, because it designates the second element of the array.
3. It is necessary to initialize the array at the time of declaration. This statement is false.
4. The declaration num[SIZE] is allowed if SIZE is a macro. This statement is true, because the MACRO just replaces the symbol SIZE with given value.
Hence the statements '1' and '4' are correct statements.
Discussion:
21 comments Page 2 of 3.
Vijay said:
1 decade ago
Third statement is false because it is not must initialization of array, at the time of declaration.
int num[26];true.
int num[]={0, 1, 2.25};true.
Because sizeof(num) --->52B (2*26).
But int num[];error. Means initialization not must and should at the time of declaration but specify the arr size is must.
int num[26];true.
int num[]={0, 1, 2.25};true.
Because sizeof(num) --->52B (2*26).
But int num[];error. Means initialization not must and should at the time of declaration but specify the arr size is must.
Manoj Joshi said:
1 decade ago
SIZE is a macro but it is not sure that SIZE will expand to an integer, it could also be like this
#define SIZE 2.55
#define SIZE 2.55
Suman Saurabh said:
1 decade ago
But in question it is not mentioned (Turbo C, or gcc) but in gcc it not necessary that SIZE must be macro it also may be a simple variable.
E.g.
int SIZE = 26;
int num[SIZE];
E.g.
int SIZE = 26;
int num[SIZE];
Rathi said:
1 decade ago
@Gopinath.Nan.
num[26] store the 26 elements because it start with 0,1,2......25.
num[26] store the 26 elements because it start with 0,1,2......25.
Sahini said:
1 decade ago
Why the third statement is false?
Dilini said:
1 decade ago
I want to know why the third statement is false?
Jeff McCracken said:
1 decade ago
SIZE could also be defined as such : int SIZE and thus size would be a valid array index and thus the index SIZE would also be allowed. The way the #4 answer is worded seems to imply that it's ONLY allowed if SIZE is a macro.
The_void said:
1 decade ago
"The declaration num[SIZE] is allowed if SIZE is a macro."
#1
num[SIZE] is not a valid declaration. Be coherent in your questions.
int num[SIZE] or "type" num[SIZE] should be...
#2
Declaration depend of how SIZE macro was defined.
#1
num[SIZE] is not a valid declaration. Be coherent in your questions.
int num[SIZE] or "type" num[SIZE] should be...
#2
Declaration depend of how SIZE macro was defined.
Nick said:
1 decade ago
int a;
#define SIZE a
int num[SIZE];
Na-ah... This question needs to state that the MACRO evaluates to a non-negative integer...
#define SIZE a
int num[SIZE];
Na-ah... This question needs to state that the MACRO evaluates to a non-negative integer...
GOPINATH.NAN said:
1 decade ago
num[26] store the 27 elements because it start with 0,1,2......26.
LIKE THAT only, then how is it true?
LIKE THAT only, then how is it true?
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