C++ code questions #include<iostream> #include<string.h> #include<stdlib.h> usin

Question

C++ code questions

#include<iostream>
#include<string.h>
#include<stdlib.h>
using namespace std;
//Class Month definition
class Month
{
//Data member to store month number
int monthNumber;
public:
//Member functions
void set_month(int);
int get_month();
void input();
void output();
void advance();
void before();
void after();
void same();
};//End of class
//Function to check month is same or not
void Month::same()
{
//To store month number
int mo;
//Variable month - to store month in character form.
//Variable monthPart - to store month first three letters
string month, monthPart;
//Accept the month
cout<<" Enter either Month Number / Month Name / First three letter of month: ";
cin>>month;
//Checks whether the first character is number or not
if(isdigit(month[0]))
{
//Checks whether double digit
if(month.length()== 2)
{
//Converts to integer
mo = month[0] - '0';
//Multiply by 10 and adds the next digit to make it double digit
mo = mo * 10;
int next = month[1] - '0';
mo = mo + next;
}//End of inner if
//If single digit
else
//Converts to integer
mo = month[0] - '0';
//Checks for invalid entry
if(mo < 0 && mo > 12)
cout<<" Invalid month number. ";
}//End of outer if
//If in character form
else
{
//Subtracts the first three characters from the entry
monthPart = month.substr(0,3);
//Converts to upper case
for(int x = 0; x < 3; x++)
monthPart[x] = toupper(monthPart[x]);
//Compares the month and stores its corresponding number form
if(monthPart.compare("JAN") == 0)
mo = 1;
else if(monthPart.compare("FEB") == 0)
mo = 2;
else if(monthPart.compare("MAR") == 0)
mo = 3;
else if(monthPart.compare("APR") == 0)
mo = 4;
else if(monthPart.compare("MAY") == 0)
mo = 5;
else if(monthPart.compare("JUN") == 0)
mo = 6;
else if(monthPart.compare("JUL") == 0)
mo = 7;
else if(monthPart.compare("AUG") == 0)
mo = 8;
else if(monthPart.compare("SEP") == 0)
mo = 9;
else if(monthPart.compare("OCT") == 0)
mo = 10;
else if(monthPart.compare("NOV") == 0)
mo = 11;
else if(monthPart.compare("DEC") == 0)
mo = 12;
else
cout<<" Invalid month name. ";
}//End of else
//Checks for similarity
if(mo == monthNumber)
cout<<" Same month ";
else
cout<<" Not Same month ";
}//End of function
void Month::input()
{
//Variable month - to store month in character form.
//Variable monthPart - to store month first three letters
string month, monthPart;
//To store month number
int mo;
//Accept the month
cout<<" Enter either Month Number / Month Name / First three letter of month: ";
cin>>month;
//Checks whether the first character is number or not
if(isdigit(month[0]))
{
//Checks whether double digit
if(month.length()== 2)
{
//Converts to integer
mo = month[0] - '0';
//Multiply by 10 and adds the next digit to make it double digit
mo = mo * 10;
int next = month[1] - '0';
mo = mo + next;
}//End of inner if
//If single digit
else
//Converts to integer
mo = month[0] - '0';
//Checks for invalid entry
if(mo < 0 && mo > 12)
cout<<" Invalid month number. ";
//Set the month number
set_month(mo);
}//End of outer if
//If in character form
else
{
//Subtracts the first three characters from the entry
monthPart = month.substr(0,3);
//Converts to upper case
for(int x = 0; x < 3; x++)
monthPart[x] = toupper(monthPart[x]);
//Compares the month and stores its corresponding number form
if(monthPart.compare("JAN") == 0)
set_month(1);
else if(monthPart.compare("FEB") == 0)
set_month(2);
else if(monthPart.compare("MAR") == 0)
set_month(3);
else if(monthPart.compare("APR") == 0)
set_month(4);
else if(monthPart.compare("MAY") == 0)
set_month(5);
else if(monthPart.compare("JUN") == 0)
set_month(6);
else if(monthPart.compare("JUL") == 0)
set_month(7);
else if(monthPart.compare("AUG") == 0)
set_month(8);
else if(monthPart.compare("SEP") == 0)
set_month(9);
else if(monthPart.compare("OCT") == 0)
set_month(10);
else if(monthPart.compare("NOV") == 0)
set_month(11);
else if(monthPart.compare("DEC") == 0)
set_month(12);
else
cout<<" Invalid month name. ";
}//End of outer else
}//End of function
//Function to display the next month
void Month::after()
{
//Adds one to month number
monthNumber++;
//Checks if it exceeds 12 then set it to one for January
if(monthNumber > 12)
{
monthNumber = 1;
}//End of if
//Display the month name
output();
}//End of function
//Function to display the previous month
void Month::before()
{
//Subtracts one to month number
monthNumber--;
//Checks if it is zero then set it to 12 for December
if(monthNumber == 0)
{
monthNumber = 12;
}//End of if
//Displays the output
output();
}//End of function
//Function to advance the month by inputed number
void Month::advance()
{
int no, diff;
//Accept the advance number
cout<<" Enter the advance value: ";
cin>>no;
//Adds the advance month number to month number
monthNumber = no + monthNumber;
//If it exceeds 12 then subtract it from 12 and store it in month number
if(monthNumber > 12)
{
monthNumber = monthNumber - 12;
}//End of if
//Displays the output
output();
}//End of function
//Function to display the month name
void Month::output()
{
//Month number is passed in switch to match the case
switch(monthNumber)
{
case 1:
cout<<"January";
break;
case 2:
cout<<"February";
break;
case 3:
cout<<"March";
break;
case 4:
cout<<"April";
break;
case 5:
cout<<"May";
break;
case 6:
cout<<"June";
break;
case 7:
cout<<"July";
break;
case 8:
cout<<"August";
break;
case 9:
cout<<"September";
break;
case 10:
cout<<"October";
break;
case 11:
cout<<"November";
break;
case 12:
cout<<"December";
break;
}//End of switch
}//End of function
//Function to return the month number
int Month::get_month()
{
return monthNumber;
}//End of function
//Function to set the month number
void Month::set_month(int no)
{
monthNumber = no;
}//End of function
//Function to return the user choice
int menu()
{
//To store user choice
int ch;
//Displays menu
cout<<" 1 Advance ";
cout<<" 2 Before ";
cout<<" 3 After ";
cout<<" 4 Same ";
cout<<" 5 Exit ";
//Accepts user choice
cout<<" Enter your choice: ";
cin>>ch;
//Returns user choice
return ch;
}//End of function
//Main function definition
int main()
{
//Month class object created
Month m;
//Accepts the user month number or name
m.input();
//To store user choice returned by the menu function
int ch;
//Loops till user choice is 5
do
{
//Accept user choice
ch = menu();
//Calls user function based on user choice
switch(ch)
{
case 1:
m.advance();
break;
case 2:
m.before();
break;
case 3:
m.after();
break;
case 4:
m.same();
break;
case 5:
exit(0);
default:
cout<<" Invalid choice. ";
}//End of switch
}while(1);// End of while
return 0;
}//End of main function

Explanation / Answer

8)

This program continues to run multiple times until the user chooses an option to exit.

9)

This program is not hardcoded.This is accepting the inputs from the user and based on that it is generating the output and displaying to the user.

10)

It is asking the programmer to choose that task which user want to perform.Based on the user’s choice the corresponding task will get executed.

____________________Thank You

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