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:
In question 1, three integer variable "m, n and i" is declared, in which variable "m and n" is used in user input, and variable "i" is used a loop to print even number from the user input values.
In question 2, a menu method is declared that prints a list menus in the next line, two methods "findsum() and revers()"is declared, in which "findsum" method is used to add odd values from 1 to 20 and the revers method is used to reverse value from an input digit. In the last line main method is declared, which uses switch to call the above methods.
In question 3, in this, a reverse method is defined, in which a char variable x is declared that input char value and define if block to check if char is equal to (.) if this is correct it will print the value in reverse order.
