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 1 of 3.
Pranali said:
8 years ago
@Niharika.
Writting macro means we have to replace that particular value/function/whatever with another value(same like find and replace method).
How to write macro?
ans=> # define a 10;
that means the value'10' will replace at the position of ' a' throughout the program.
'#' indicates that it is(macro expansion is) work of preprocessor.
Writting macro means we have to replace that particular value/function/whatever with another value(same like find and replace method).
How to write macro?
ans=> # define a 10;
that means the value'10' will replace at the position of ' a' throughout the program.
'#' indicates that it is(macro expansion is) work of preprocessor.
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.
Shireen Nagdive said:
1 decade ago
According to me, third statement is false because it is not necessary to give values to the array elements at the time of declaration. We can simply do eg. int array[10];Execute other steps and then through scanf or whatever way can give value to the array elements.
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.
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.
Pranali said:
8 years ago
@Nidhi Goud.
Because an array allocates memory at compile the time not at runtime, so we have to say to the compiler that 'my array will contain 1,2,etc (any one digit) number of elements'. got it?
Because an array allocates memory at compile the time not at runtime, so we have to say to the compiler that 'my array will contain 1,2,etc (any one digit) number of elements'. got it?
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];
Pranali said:
8 years ago
@Amit.
It is not compulsory to initialize array at the time of declaration.
we can initialize array member by member also.as,
arr[0]=1;
arr[1]=2;
.
.
.
.etc
It is not compulsory to initialize array at the time of declaration.
we can initialize array member by member also.as,
arr[0]=1;
arr[1]=2;
.
.
.
.etc
Amit said:
1 decade ago
It is necessary to initialize the array at the time of declaration.
I think this is the correct statement. Please evaluate this option
I think this is the correct statement. Please evaluate this option
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...
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