16. Program that continuously inputs positive integer values from the user. The program should finally display the second largest number entered.

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Chapter 6: 

Looping Structures

Programming Exercise

Problem # 16:

Write a program that continuously inputs positive integer values from the user. The user enters a zero to show that he has no more values to enter. The program should finally display the second largest number entered.

Solution:

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
    int highest, marks, highest_2;
    cout<<"Enter a positive number (0 for exit): ";
    cin>>marks;
    if(marks>0)
    {
        highest_2=highest=marks;
        do{
            if(marks>highest)
            {
                highest_2=highest;      
                highest=marks;
            }
            cout<<endl<<"Enter a positive number (0 for exit): ";
            cin>>marks;
        }
        while(marks>0);
        cout<<endl<<"2nd highest number is:"<<highest_2;  
    }
    return 0;  
}

Let me know in the comment section if you have any question.

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15. Program that inputs an integer and displays whether it is a prime number or not.

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