Finding largest two numbers from N numbers

Finding largest two numbers from N numbers:

 This C program example finds the two largest numbers from the list of 'N' numbers.

Mechanism:

In this program, we have declared the variable of:

• Size
• Input
• First largest
• Second largest

 First, we take input of size and then we enter a for loop which executes for 'size' times. This program is designed in such a way that it checks all negative and positive integers. This program uses an if else and else if structure and for loop structure structure to execute the logic of the program. This program also works on boundary lines. Time complexity of this program is O(size). Once the loop terminates, it prints the first largest and second largest value from the N numbers.

Code:

/*              Join us at


http://shapesinc.blogspot.com 


for more codes of shapes                            


*/


#include<iostream>


using namespace std;

int main()

{

cout << "Join http://shapesinc.blogspot.com for more codes of shapes\n\n";

cout<<"CAUTION:   The input should not be other than numerical values \n\n\a"; 

int  i, num, largest = 0, seclargest = 0, size;

 cout << "Enter the amount of numbers you want to enter\n";
 cin>>size;
 if (size<=0)
 {
  cout << "No values entered\n";
  goto finish;
 }

 cout << "Please enter the numbers from the keyboard.\n" << endl;

 for (int i=0; i<size;  i++ ) 
 {

  cin >> num; 
  if(i==0)
   largest=num;
  else if(i==1)
  {
   if(num>largest)
   {
    seclargest = largest;
    largest = num;

   }
   else
    seclargest=num;

  }

  else if ( num > largest ) 
  {
   seclargest = largest;
   largest = num;

  }
  else if ( num > seclargest )
   seclargest = num;

 }
 cout << "\nThe largest of the numbers entered is " << largest << endl ; 

 cout << "\nThe second largest of the numbers entered is " << seclargest << endl ;
finish:

 return 0;
}

Final Words:
By this post, you can learn C online practically. We have tried our best to make this program understandable and optimized.

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