how to find length of array in java

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How do I detect the length of an array in C/C++?

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Some of the methods to find the length of an assortment are given as follows −

Method 1 - Using sizeof operator

The sizeof() operator tin can be used to find the length of an array. A programme that demonstrates the apply of the sizeof operator in C++ is given as follows.

Instance

 Live Demo

#include <iostream> using namespace std; int main() {    int arr[5] = {4, ane, eight, 2, 9};    int len = sizeof(arr)/sizeof(arr[0]);    cout << "The length of the array is: " << len;    render 0; }

The output of the above program is as follows −

The length of the array is: 5

Now, let us empathise the above program.

The variable len stores the length of the array. The length is calculated by finding size of array using sizeof and and so dividing it by size of one element of the assortment. Then the value of len is displayed. The lawmaking snippet for this is given as follows −

int arr[5] = {iv, ane, viii, 2, nine}; int len = sizeof(arr)/sizeof(arr[0]); cout << "The length of the array is: " << len;

Method ii - Using pointers

Arrow arithmetic can be used to notice the length of an assortment. A programme that demonstrates this is given as follows.

Instance

 Live Demo

#include <iostream> using namespace std; int main() {    int arr[five] = {5, 8, 1, 3, half dozen};    int len = *(&arr + 1) - arr;    cout << "The length of the assortment is: " << len;    return 0; }

Output

The output of the to a higher place program is every bit follows −

The length of the array is: v

Now, permit us understand the higher up programme.

The value independent in *(&arr + 1) is the address subsequently 5 elements in the array. The value contained in arr is the address of the starting element in array. And then their subtraction results in the length of the array. The code snippet for this is given as follows −

int arr[five] = {5, 8, 1, three, vi}; int len = *(&arr + 1) - arr; cout << "The length of the array is: " << len;

Published on 21-Nov-2018 11:48:41

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Source: https://www.tutorialspoint.com/how-do-i-find-the-length-of-an-array-in-c-cplusplus

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