C++ Language Use functions to solve all problems in the mentioned assignment

Following are the program to this question:

Q1:

#include <iostream> //including header file

using namespace std;

int main() //defining main method

{

   int m,n,i; //defining integer variable

   cout<<"Enter starting value: "; //print message

   cin>>m; //input m variable value

   cout<<"Enter ending value: ";//print message

   cin>>n;//input n variable value

   for(i=m;i<=n;i++) //defining loop to count even number  

   {

       if(i%2==0) //check even number condition

       {

           cout<<i<<" "; //print value

       }

   }

   return 0;

}

Q2:

#include<iostream> //include header file

using namespace std;

void menu() //define method menu

{

cout<<"Enter 1 for print your name and id: "<<endl; //print message

cout<<"Enter 2 for sum of odd numbers from 1 to 20: "<<endl;//print message

cout<<"Enter 3 for reverse of any number: "<<endl;//print message

cout<<"Enter 4 for exit"<<endl;//print message

}

void findsum() //define method findsum

{

int s=0,i; //defining integer variable

for(i=1;i<=20;i++) //defining loop to count odd number  

{

s=s+i; //add numbers

}

cout<<"Odd number sum from 1 to 20: "<<s; //print value

}

void revers() //defining method revers

{

int n,r,rev=0; //defining integer variable

cout<<"enter any number: "; //print message

cin>>n; //input value

while(n!=0) //define loop to reverse value

{

r=n%10; //store value in r variable

rev=(rev*10)+r; //add reverse value

n=n/10; //divide digit

}

cout<<"The reverse of a given number is: "<<rev; //print reverse value

}

int main() //defining main method

{

int c,rn; //defining integer variable

char n[30]; // defining char variable

menu(); //calling menu method

cout<<"Enter your selected choice: "<<endl; //print message

cin>>c; //input value in char variable

switch(c) //defining switch

{

   //defining case

case 1: cout<<"Enter your name: "<<endl; //print message for input name and id  

       cin>>n;//input name

       cout<<"Enter registration number: "<<endl; //print message  

       cout<<"Name: "<<n<<endl; // print name value

       cout<<"Registration number: "<<rn<<endl; // print id value

   break;

case 2: findsum(); //calling findsum method

   break;

case 3: revers(); //calling reverse method

   break;

case 4: exit(1); // calling exit method

   break;

default: cout<<"please enter valid choice"; //defining default choice

   break;

}

return 0;

}

Q3:

#include <iostream>//defining header file

using namespace std;

void reverse() //defining method readInput

{

  char x; //defining char variable

  cout<<"Enter a character: "; //print message

  cin>>x; //input value

  if(x=='.') //defining condition that check value is .  

   return; //using return keyword

  reverse(); //calling readInput method

  cout<<x; //print value

}

int main() //defining main method

{

  reverse(); //calling readInput method

return 0;    

}

Output:

please find the attachment.

Explanation:

Description of the given question as follows:

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.