C++ program for finding the second smallest element in an array

February 19, 2021

Finding second smallest element in array

An array is a group of similar type of data that are addressed by an common name (Arr[]). Array of any type can be created and may have one or more dimensions, i.e. 1-D Array, 2-D Array etc. Here we will learn how to code a C++ program for finding second smallest element in an array.

C++ program for finding the second smallest element in an array

Algorithms:-

  1. Take array as input
  2. sort the array in ascending order using any sorting algorithm
  3. traverse through the array and compare wether the element is equal to first element of array
  4. if element is not equal to first element return the element
  5. if no second element found return -1

C++ Code:

//C++ program
//program for finding the second smallest element in an array
#include<iostream>
using namespace std;
int prep(int a[], int total)
{
    int temp;  
    for (int i = 0; i < total–1; i++)   
    {  
        for (int j = i + 1; j < total; j++)   
        {  
            if (a[i] > a[j])   
            {  
                temp = a[i];  
                a[i] = a[j]; 
                a[j] = temp;  
            }  
        }  
    } 
    for(int i=1;i<total;i++)
    {
        if(a[i]!=a[0])
            return a[i];
    } 
    return –1 ; //all elements are equal  
} 
int main()
{
    int a[]={7,8,9,5,2};  
    cout<<“Second smallest:  “<<prep(a,5));
    return 0;
}
    
    Output–

    Second smallest: 5

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