Answer: The c++ program to implement order() method is given below.
#include <iostream>
using namespace std;
void order(int a, int b, int c);
int main() {
int x, y, z;
cout<<"This program displays numbers in descending order."<<endl;
do
{
cout<<"Enter first number"<<endl;
cin>>x;
if(x<0)
cout<<"Invalid input. Enter a positive number."<<endl;
}while(x<0);
do
{
cout<<"Enter second number"<<endl;
cin>>y;
if(y<0)
cout<<"Invalid input. Enter a positive number."<<endl;
}while(y<0);
do
{
cout<<"Enter third number"<<endl;
cin>>z;
if(z<0)
cout<<"Invalid input. Enter a positive number."<<endl;
}while(z<0);
order(x, y, z);
return 0;
}
void order(int a, int b, int c)
{
if((a>b)&&(a>c))
{
cout<<"Numbers in decreasing order are"<<endl;
cout<<a<<endl;
if(b>c)
{
cout<<b<<endl;
cout<<c<<endl;
}
else
{
cout<<c<<endl;
cout<<b<<endl;
}
}
if((b>a)&&(b>c))
{
cout<<"Numbers in decresing order are"<<endl;
cout<<b<<endl;
if(a>c)
{
cout<<a<<endl;
cout<<c<<endl;
}
else
{
cout<<c<<endl;
cout<<a<<endl;
}
}
if((c>b)&&(c>a))
{
cout<<"Numbers in decreasing order are"<<endl;
cout<<c<<endl;
if(a>b)
{
cout<<a<<endl;
cout<<b<<endl;
}
else
{
cout<<b<<endl;
cout<<a<<endl;
}
}
}
OUTPUT
This program displays numbers in descending order.
Enter first number
12
Enter second number
-9
Invalid input. Enter a positive number.
Enter second number
0
Enter third number
55
Numbers in decreasing order are
55
12
0
Explanation:
The method order() is declared as follows.
void order(int a, int b, int c);
The method is declared void since it does not return any value.
This program is designed to accept 0 and positive integers only. This is implemented by do-while loop while taking user input.
The program uses 3 integer variables to store the user input.
int x, y, z;
The method order() is designed to accept 3 integer parameters. This method is called once user enters valid input.
order(x, y, z);
These numbers are compared in order to display them in descending order.
No variable is used for comparison. The method simply compares the numbers and displays them using multiple if-else statements.
