It is because array name implies its address and if you want to access first element of it pointer address logic is as below:
Arrays first element address = array base address + 0
Arrays second element address = array base address + 1
Full representation of an array begins from the index 0 and ends at n-1 where n is the number of variables of the array.
By design; it makes the compiler's work easier. 1-based array's addressing-function: Address (array, index) = Address (array) + (index-1)*Elemsize(array) 0-based array's addressing-function: Address (array, index) = Address (array) + index*Elemsize (array)
#include<stdio.h> #include<conio.h> main() { int a[100]; int n,largest,index,position; printf("enter the number of elements in the array"); scanf("%d",&n); printf("enter %d elements",n); for(index=0;index<n;index++) scanf("%d",&a[index]); largest=a[0]; position=0; for(index=1;index<n;index++) if(a[index]>largest) { largest=a[index]; position=index; } printf("largest element in the array is %d\n",largest); printf("largets element's position in the array is %d\n",position+1); getch(); }
The error message "index 1 is out of bounds for axis 0 with size 1" in Python programming indicates that you are trying to access an element at index 1 in an array or list that only has one element. This means that the index you are trying to access is beyond the bounds of the array or list.
A square array has the same number of columns and rows the array [1] is a square array (a trivial example) the array [1 0] [0 1] is a square array the array [1 0 0 0] [0 1 0 0] [0 0 1 0] [0 0 0 1] is a square array the array [1 0 0 0] [0 1 0 0] [0 0 1 0] is not a square array
To reference elements in an array, you typically use the array name followed by an index in square brackets. The index usually starts at 0 for the first element, so for an array named arr, the first element would be accessed with arr[0]. For example, arr[1] would reference the second element. Ensure that the index is within the bounds of the array to avoid errors.
(array.length - 1) will find the index of the last element in an array (or -1 if the array is empty).
In a complete binary tree (CBT) stored using an array, the parent of an element at index i can be found at index (i-1)/2, assuming the array is 0-indexed. So for an element stored at index 11, the parent node would be stored at index (11-1)/2 = 5.
#include<stdio.h> // returns the index of the largest value in the array int max (int a[], unsigned size) { if (!size) return -1; // invalid array int index = 0; // assume index 0 holds the largest value (so far) for (int i=1; i<size; ++i) { // traverse the remainder of the array if (a[i]>a[index]) { // compare with the current largest index = i; // the current value is larger } } return index; // a[index] holds the largest value } int main (void) { int x[10] = {7, 4, 3, 9, 5, 2, 1, 8, 6}; printf ("The largest value in the array is %d\n", max (x, 10)); return 0; }
Array indices are zero-based because the first element is at offset zero from the start of the array. There is no such thing as a one-based array in C. Some other languages do allow you to specify the base of an array, but converting a non-zero-based index to a zero-based index adds a runtime overhead to the implementation.
C++ array indices are zero-based because the first element in any array is offset 0 elements from the start address. The second element is offset by 1 element and the third by 2 elements, and so on. To put it another way, the index refers to the number of elements that come before the desired element. The first element has zero elements before it, so it is index 0. For an array of n elements, the last element is at index n-1.
In most programming languages, the starting index of a matrix or array is typically 0. This means that the first element is accessed using index 0, followed by index 1 for the second element, and so on. However, some languages, like MATLAB and Fortran, use 1-based indexing, where the first element is accessed with index 1. It's important to be aware of the indexing convention used in the specific programming language you are working with.