Linear Search

Here, We discuss about Linear Search, their implementation in C, time and space complexity and its applications.

Linear Search is the simplest searching algorithm. It searches for an element in the list in sequential order.

Linear search is used on a collection of items. We start at one end and check every element until the desired element is not found.

linear search


Sample Code in C :

//Linear Search in C


int linearsearch(int arr[], int n, int x)
  //going through array sequencially
  for(int i=0; i<n; i++)
    if(arr[i] == x)
      return i;
  return -1;

int main()
  int data[] = {3, 15, 8, 1, 38, -2, 7};
  int x = 1;
  int n = sizeof(data) / sizeof(data[0]);
  int result = linearsearch(arr, n, x);
  if (result == -1)
    printf("Element not found");
    printf("Element found at index : %d", result);
Code language: C/AL (cal)

Time and Space Complexity

Time Complexity
Worst CaseO(n)
Best CaseO(1)
Average CaseO(n)
Space Complexity
Worst CaseO(1)


  1. For searching operations in smaller arrays (<100 items).

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