Here is a C++ program to search an element in an array using linear search. In this C++ program we have to search an element in a given array using linear search algorithm. If given element is present in array then we will print it's index otherwise print a message saying element not found in array.
For Example :Input Array : [2, 8, 4, 2, 14, 10, 15] Element to search : 4 Output : Element found at index 2
Algorithm to search an element in array using linear search
- First take number of elements in array as input from user and store it in a variable N.
- Using a loop, take N numbers as input from user and store it in array(Let the name of the array be inputArray).
- Ask user to enter element to be searched. Let it be num.
- Now, using a for loop, traverse inputArray from index 0 to N-1 and compare num with every array element. If num is equal to any array element then print a message saying "Element found at index 4" otherwise print "Element Not Present".
C++ program for linear search in array
#include <iostream>
using namespace std;
int main(){
int input[100], count, i, num;
cout << "Enter Number of Elements in Array\n";
cin >> count;
cout << "Enter " << count << " numbers \n";
// Read array elements
for(i = 0; i < count; i++){
cin >> input[i];
}
cout << "Enter a number to serach in Array\n";
cin >> num;
// search num in inputArray from index 0 to elementCount-1
for(i = 0; i < count; i++){
if(input[i] == num){
cout << "Element found at index " << i;
break;
}
}
if(i == count){
cout << "Element Not Present in Input Array\n";
}
return 0;
}
Output
Enter Number of Elements in Array 6 Enter 6 numbers 8 4 7 1 3 9 Enter a number to serach in Array 3 Element found at index 4
Enter Number of Elements in Array 6 Enter 6 numbers 8 4 7 1 3 9 Enter a number to serach in Array 2 Element Not Present in Input Array
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