in an array(int) of x elements what is the last index of the array(static) ? a) x-1 b)programmer defined?

write statements to declare the array and assign the values to the corresponding positions.
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lets say i have an array int a[20] and i take only 10 elements as input (and not initialised) ..so when we refer to elements shouldnt it be just 10? are those empty also counted as elements?

eg : in the above array the total elements are just 10 ,but the last index is 19

is this correct?

edit: Yes this was a qutestion in one of my tests the sameple would be something like:

#include<stdio.h>
main()
{
  int a[100],i;
  for(i=0;i<10;i++)
     {
         scanf("%d",&a[i]);
     }
     //will the value of a[99] also come under "elements"?
}

You should keep a count of how many elements have a valid value ... and do not attempt to read the unitialized ones.

int a[7];
int n = scanf("%d%d%d%d%d%d", a+0, a+1, a+2, a+3, a+4, a+5);
if (n >= 1) {
    printf("last one: %d\n", a[n - 1]);
    //printf("UB: %d\n", a[n]);
    //printf("UB: %d\n", a[6]); //a[6] is uninitialized / not assigned a value
}

7.4 If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, the highest index in array list is B. The program has a runtime error because the array elements are not initialized. D. The program has a compile error because i is not defined in the last public static void main(String[] args) { final int[] x = {1, 2, 3, 4}; int[] y = x; What Is The Index Number Of The Last Element Of An Array With 29 Elements? A. 29 B. 28 C. 0 D. Programmer-defined 3. Which Of The Following Is A Two-dimensional Array?

In your example, a has 100 elements. You then enter a value into the first 10 of those elements.

So you have an array with 100 elements, and of those the first 10 have defined values (e.g. the ones you assigned) and the rest have indeterminate values.

1) Indexed means that the array elements are numbered (starting at 0). So, we could think of the last declaration as a table with 5 rows and 10 columns, int x = 0;. Can we do the same for arrays? Yes, for the built-in types. Simply list the It is the programmer's job to make sure that out of bounds indices are not used. Write a static method named range that takes an array of integers as a parameter and returns the range of values contained in the array. The range of an array is defined to be one more than the difference between its largest and smallest element.

Well, you actually answer the question in your question....

lets say i have an array int a[20] .....

eg : in the above array the total elements are just 10 ,but the last index is 19

That's it! For an array of x elements the last index is a) x-1

If you have an array of 100 elements the last index is always 99 (i.e. 100-1).

It does not matter that you only write to 10 of the 100 elements. It just means that you have an array with 10 initialized elements and 90 uninitialized elements. But there are still 100 elements and memory have been allocated for 100 elements and the last valid index is always 99.

So you could do:

#include<stdio.h>
main()
{
  int a[100],i;
  for(i=0;i<10;i++)
  {
    scanf("%d",&a[i]);  // you should check return value here...            
  }
  a[99] = 42;  // Write to element number 100 using index 99
}

The following displays the indexes and values in an array with 10 elements of type int. our numbers array, and the last index is one less than the length of the array. length of a int array from the user and assigns 1 at index 0, assigns 2 at index 1 public class Temperature { public static void main(String[] args) { Scanner  Answer: There are several ways to define an int array in Java; let’s take a look at a few examples. 1) Declare a Java int array with initial size; populate it later. If you know the desired size of your array, and you’ll be adding elements to your array some time later in your code, you can define a Java int array using this syntax:

class ArrayDemo { public static void main(String[] args) { // declares an array of integers int[] anArray; at index 0: " + anArray[0]); System.out.println("Element at index 1: " + anArray[1]); In a real-world programming situation, you would probably use one of the supported looping declares an array of integers int[] anArray;. Start studying COP3502 EXAM 2. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

In the Java programming language, arrays are objects (§4.3.1), are the components of the array are referenced using integer indices from 0 to n - 1, The value of an array component of type float is always an element of the float int a, b[], c[][]; x, y; } class ColoredPoint extends Point { int color; } class Test { public static  Start studying Java Chapter 8. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Obviously, you need a better approach over defining 100 different variables So​, the first element of the array has index 0, the second element has index 1 and so on. taking the values of the different elements of the array from user one by one. In the function public static int cal_sum(int[] a), this a will become x ( as we​  The array variable list contains a memory address that refers to an array of 10 int values. Assume the signature of the method xMethod is as follows. public static void xMethod(double[] a)

Comments
  • When you do int a[20] then there's already 20 elements, regardless of whether you initialize them or not. The ones you don't initialize will just have rubbish values.
  • @Blaze with an initializer, i.e. int a[20] = { 1, 2, 3, 4, 5, 7, 8, 9, 10 }, the remaining 10 values are zero-initialized, that is, initialized as if a[] had static storage duration.
  • This sounds like a quizz or exam question. Best if you look it up, then you learn more than from us giving you answer c)
  • "i take only 10 elements as input (and not initialised)" What does this even mean? Please post some example code in either C or C++.
  • @DavidBowling That's right. On a related note, I used to think that ` int a[20] = {0}` stands for "init the whole thing with zeros"... not knowing that the first int is set to 0 for different reasons than the other 19. Luckily the result is the same. :)
  • Curious code sample used 6 %d rather than 7 and a+6.
  • @chux: I wanted to make sure I had a final valid (but uninitialised) array element.