Question

A. Write a C++ with a menu (using switch) that asks the user to select one of the following choices to the user:

1. Options ‘S’ or ‘s’

2. Option ‘T’ or ‘t

3. Options ‘P’ or ‘p’

4. print in the Matrix format

B. When 1 is selected, prompt the user to enter the starting value st (int value). Use a single FOR loop to count numbers from 1 to st. When the loop is finished, find the average of those numbers.

C. When 2 is selected, prompt the user for a number num (int). Use a single WHILE loop to calculate the sum of the odd numbers between 1 and num.

D. When 3 is selected. Use a single DO-WHILE loop to promt the user to enter random (int) values and stop whenver the first negative value is entered. Then tell the user how many positive value has been entered.

E. When 4 is selected. Use NESTED FOR loops to output all the even numbers from 1 to 80 in 5 rows and 8 columns.

NB. If the user does not select one of these 4 options print " invalid selection".

Answer 1

#include<bits/stdc++.h>
using namespace std;
//option function
void option()
{
   //prompt message for the user
   cout<<"================================="<<endl;
   cout<<"1. Options 'S' or 's' "<<endl;
   cout<<"2. Options 'T' or 't' "<<endl;
   cout<<"3. Options 'P' or 'p' "<<endl;
   cout<<"4. Print in the Matrix format"<<endl;
   cout<<"================================="<<endl;
}
//main function
int main()
{
   //cjoice variable
   char choice;
   //call the option function
   option();
   //take input from the user
   cin>>choice;
   //switch statement
   switch(choice)
   {
       //if the case is 'S'. 's' or 1
       case 'S':
       case 's':
       case '1':
       {
           //initialize the st varibale and count varibale
           int st,count=0;
           //prompt to user
           cout<<"Enter the starting value : ";
           //take input from the user
           cin>>st;
           //for loop till st from 1
           for(int i=1;i<=st;i++)
               //increment 1 in count
               count++;
           //average of the first n natural number
           float average = float(st+1)/2;
           //output for the user
           cout<<"Average = "<<average<<endl;
           //then break
           break;
       }
       //if the case is 'T' ,'t' or 2
          case 'T':
       case 't':
       case '2':
       {
           //initialse the varibal num and sum_odd
           int num,sum_odd = 0;
           //message for the user
           cout<<"Enter a number : ";
           //take input from the user
           cin>>num;
//           while loop till num is not 0
           while(num>0)
           {
               //if number is odd
               if(num%2==1)
               //then add to sum_odd varaible
               sum_odd = sum_odd+num;
               //decrement in num
               num--;
           }
           //output for the user
           cout<<"Sum of odd "<<sum_odd<<endl;
           break;
       }
       //if the case is 'P' ,'p' or 3
       case 'P':
       case 'p':
       case '3':
       {   //initialize the variable
           int random;
           //count as 0
            int   count = 0;
            //do while loop
           do
           {
               //prompt for the user
               cout<<"Enter random number : ";
               //take input from the user
               cin>>random;
               //if number is positive then increment 1 in count
               if(random>0)
                   count++;
           }
           //terminating condition
           while(random>0);
           //output for the user
           cout<<"Total positive number "<<count<<endl;
           break;
       }
       //for case 4
       case '4':
       {
           //initial k
           int k = 2;
           //for all row
           for(int i=1;i<=5;i++)
           {
               //for all column
               for(int j=1;j<=8;j++)
               {
                   //output for user
                   cout<<setw(3)<<k;
                   //move to next even
                   k = k+2;
               }
               cout<<endl;
           }
           break;
       }
       //default case
       default:
           //message for the user
           cout<<"Invalid selection";
   }
}

If you have any problem then let me know in comment box and if like then please rate or give a big thumbs up thank you.