How do I find a particular value in an array and return its index?

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Pseudo Code:

int arr[ 5 ] = { 4, 1, 3, 2, 6 }, x;

x = find(3).arr ; 

x would then return 2.

The syntax you have there for your function doesn't make sense (why would the return value have a member called arr?).

To find the index, use std::distance and std::find from the <algorithm> header.

int x = std::distance(arr, std::find(arr, arr + 5, 3));

Or you can make it into a more generic function:

template <typename Iter>
size_t index_of(Iter first, Iter last, typename const std::iterator_traits<Iter>::value_type& x)
{
    size_t i = 0;
    while (first != last && *first != x)
      ++first, ++i;
    return i;
}

Here, I'm returning the length of the sequence if the value is not found (which is consistent with the way the STL algorithms return the last iterator). Depending on your taste, you may wish to use some other form of failure reporting.

In your case, you would use it like so:

size_t x = index_of(arr, arr + 5, 3);

Find the index of an array element in Java, Given an array of N elements and an element K, find the index of an which will rreturn the index if the element is present, else it returns -1. Pseudo Code: int arr[ 5 ] = { 4, 1, 3, 2, 6 }, x; x = find(3).arr ; x would then return 2.

Here is a very simple way to do it by hand. You could also use the <algorithm>, as Peter suggests.

#include <iostream>
int find(int arr[], int len, int seek)
{
    for (int i = 0; i < len; ++i)
    {
        if (arr[i] == seek) return i;
    }
    return -1;
}
int main()
{
    int arr[ 5 ] = { 4, 1, 3, 2, 6 };
    int x = find(arr,5,3);
    std::cout << x << std::endl;    
}

Find a Fixed Point (Value equal to index) in a given array , If it is, then return it; otherwise check whether index of middle element is greater than value Duration: 8:46 Posted: Sep 4, 2019 Here, you’re supplying INDEX with the array of values returned by the LINEST function. That’s the first argument to INDEX. The second and third arguments to INDEX are the numbers 3 and 1, which instruct INDEX to find the value in the third row and first column of the array and return it to the worksheet.

the fancy answer. Use std::vector and search with std::find

the simple answer

use a for loop

Array.prototype.findIndex(), See also the find() method, which returns the value of an array element, instead of its index. Syntax. arr .findIndex( callback ( element [, index [,� Binary search: Binary search can also be used to find the index of the array element in an array. But the binary search can only be used if the array is sorted . Java provides us with an inbuilt function which can be found in the Arrays library of Java which will rreturn the index if the element is present, else it returns -1.

#include <vector>
#include <algorithm>

int main()
{
     int arr[5] = {4, 1, 3, 2, 6};
     int x = -1;
     std::vector<int> testVector(arr, arr + sizeof(arr) / sizeof(int) );

     std::vector<int>::iterator it = std::find(testVector.begin(), testVector.end(), 3);
     if (it != testVector.end())
     {
          x = it - testVector.begin();
     }
     return 0;
}

Or you can just build a vector in a normal way, without creating it from an array of ints and then use the same solution as shown in my example.

Indexed collections, Otherwise, an array with a single element (the provided value) will be created. Calling It always returns the index of the last element plus one. The findIndex () method returns the index of the first element in an array that pass a test (provided as a function). The findIndex () method executes the function once for each element present in the array: If it finds an array element where the function returns a true value, findIndex () returns the index of that array element (and does not check the remaining values)

If the array is unsorted, you will need to use linear search.

How to Search Arrays in JavaScript, How to search arrays in JavaScript using for loops as well as indexOf, lastIndexOf , in an array to see if they match a particular value or fulfill specified criteria. It will return the index number of the matching value or -1 if there is no match. print(cord) print("*** Get the index of an element based on multiple conditions Numpy Array ***") # Create a numpy array from a list of numbers. arr = np.array( [11, 12, 13, 14, 15, 16, 17, 15, 11, 12, 14, 15, 16, 17]) # Get the index of elements with value less than 16 and greater than 12.

JavaScript Array findIndex() Method, If it finds an array element where the function returns a true value, findIndex() Get the index of the first element in the array that has a value above a specific� Use logical indexing with a simple assignment statement to replace the values in an array that meet a condition. Replace all values in A that are greater than 10 with the number 10. A(A>10) = 10

Array methods, It returns a new array copying to it all items from index start to end (not including They are used to calculate a single value based on the array. You can use a formula based on the IF function, the ISNUMBER function and the SEARCH function to achieve the result of return a value if Cell contains a specific value.

Array.IndexOf Method (System), Searches for the specified object and returns the index of its first occurrence in a The index of the first occurrence of value in array , if found; otherwise, the� How I can find index of element in array?. Learn more about indexing, array, machine learning examples

Comments
  • Index should probably be an unsigned type at the least.
  • Are you sure you want to use index. It would probably be neater to use some form of iterator.
  • If the searched value is not found, what return value do you want?
  • The best answer: Use std::find() on the arrays.
  • Please add some explanation to your answer to make it more useful for other readers.