//Header Files #include <string> #include <cmath> #include <iostream> #include <

Question

//Header Files

#include

<string>

#include

<cmath>

#include

<iostream>

#include

<iomanip>

using

namespace std;

//Function Headings

int

DayofWeek(int DayofWeek, int intRes1 = 0, int intRes2 = 0, int intRes3 = 0, int JDN = 0, bool dataOK = false);

void

DetermineWeekDay(float day,float month,float year,int JDN,int intRes1,int intRes2,int intRes3,int& DayofWeek);

?

//Main Function

int

main()

{

//Declaring Variables

float day;

float month;

float year;

int DayofWeek;

int intRes1 = 0;

int intRes2 = 0;

int intRes3 = 0;

int JDN = 0;

bool dataOK = false;

do

{

//Ask User To Enter Month

cout<<

"Please enter the month:" ;

cin>> month;

//Ask User To Enter Day Of The Week

cout<<

"Please enter the week day:" ;

cin>> day;

//Ask User To Enter The Year

cout<<

"Please enter the year:" ;

cin>> year;

//

if (month<13)

dataOK =

true;

else

cout<<

"Please enter a number less than 13 for the month:" << endl;

if (day<32);

else

cout<<

"Please enter a number less than 32 for the day:" << endl;

if((year>1582),//Picks any years from Gregorian Calendar greater than 1582

(month>10)&&(year==1582),

//Picks months greater than 10 in 1582 from Gregorian Calendar

(month==10)&&(day>15)&&(year==1582));

//Picks only month 10 and any days over 15 in year 1582 from Gregorian Calendar

}

while (dataOK==false);

DetermineWeekDay (day,month,JDN,year,intRes1,intRes2,intRes3,DayofWeek);

cin.get();

cin.get();

return 0;

}

void

DetermineWeekDay (float day,float month,float year, int JDN, int intRes1,int intRes2,int intRes3,int&DayofWeek);

{

//Precondition: The day of the week must be entered

//Postcondition: The user must enter information correctly

?

intRes1 = (2-year/100 + year/400);

intRes2 =

int(365.25 * year);

intRes3 =

int(30.6001 * (month + 1));

JDN = ((intRes1 + intRes2 + intRes3 + day) + 1720944.5);

DayofWeek = ((JDN + 1) % 7);

cout<<

"The day of the week"<<"for"

<<month<<day<<year<<

"is"<<DayofWeek;

if (DayofWeek == 0)

cout<<

"Sunday";

else if (DayofWeek == 1)

cout<<

"Monday";

else if (DayofWeek == 2)

cout<<

"Tuesday";

else if (DayofWeek == 3)

cout<<

"Wednesday";

else if (DayofWeek == 4)

cout<<

"Thursday";

else if (DayofWeek == 5)

cout

"Friday";

else if (DayofWeek == 6)

cout<<

"Saturday";

return ;

}

Explanation / Answer

#include #include #include #include using namespace std; //Determine Function Prototypes void DetermineWeekDay(float, float, float, int, int, int, int, int&); int main() { //Input variables float day; float month; float year; int DayofWeek; int intRes1 = 0; int intRes2 = 0; int intRes3 = 0; int JDN = 0; bool dataOK = false; do { cout > month; cout > day; cout > year; if (month

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