Can anybody convert this program.
Hi gang
Was hoping somebody could find the time to convert this C++ program to C.
As i'm new to programming i could see both formats thanks.
#include <iostream>
#include <iomanip>
#include <cmath>
#include <windows.h>
#include <cstdlib>
// using statements
using namespace std;
// function prototypes
void clrscr();
void gotoxy(int,int);
// classes
class calender
{
public:
calender(int d=1,int m=1,int y=2001); //defaults to 1/1/2001 (uk format dd/mm/yy)
virtual ~calender() {} // do nothing destructor virtual in case of use of inheritance
void printcalender();
private:
bool isleapyear(); // returns true if year is leap
int checkday(int); // checks legality of date
int whatdayisfirstofmonth(); // returns 0 to 6 sunday to saturday
int howmanydays(); // returns number of days in month
int day;
int month;
int year;
};
//////////////////////////////////////////////////////////////////////////////////////////////
// constructor
//
// checks validity of date and sets members
//
//////////////////////////////////////////////////////////////////////////////////////////////
calender::calender(int d,int m,int y)
{
if (y<1582) // church accepted gregorian calender in 1582
{
cout<<endl<<"The year "<<y<<" is before the gregorian calender was accepted by the church."
<<"Setting to 2001."<<endl;
year=2001; // invalid year so set to 2001
}
else
{
year=y; // y is valid so use it to set year
}
if ((m>=1) && (m<=12)) // check month between 1 and 12
{
month=m; // if it is set month
}
else
{
cout<<endl<<"The month "<<m<<" is invalid. Setting to month 1"<<endl;
month=1;
}
day=checkday(d); // validate the day
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// isleapyear()
//
// checks whether year is a leap year in the gregorian calender
// a year is leap if it is divisable by four but not if divisible by 100
// unless it is divisible by 400
//
// returns true if leap and false if not
//
//////////////////////////////////////////////////////////////////////////////////////////////
bool calender::isleapyear()
{
if ((year%400==0) || ((year %4==0) && (year%100 !=0)))
{
return true; // its a leap year
}
else
{
return false; // its not a leap year
}
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// checkday(int)
//
// checks day is legal for month
//
// in:- day to be tested
//
// returns day if legal and 1 if not legal
//
//////////////////////////////////////////////////////////////////////////////////////////////
int calender::checkday(int testday)
{
if ((testday>0) && (testday<= howmanydays()))
{
return testday; // day is valid for month
}
cout<<endl<<"Invalid day entered "<<testday<<"/"<<month<<"/"<<year
<<". Setting to the first of the month."<<endl;
return 1; // hopefully wont get here but if invalid day entered day is set to 1
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// int howmanydays()
//
// returns number of days in month
//
//////////////////////////////////////////////////////////////////////////////////////////////
int calender::howmanydays()
{
if((month==2)&& isleapyear())
{
return 29; // feb has 29 days in a leap year
}
static const int daysinmonth[12]={31,28,31,30,31,30,31,31,30,31,30,31};
return daysinmonth[month-1];
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// int whatdayisfirstofmonth()
//
// uses zeller's algorithm to find out what day the first of the month falls on falls on.
//
// returns 0 to 6 corresponding to sunday to saturday.
//
//////////////////////////////////////////////////////////////////////////////////////////////
int calender::whatdayisfirstofmonth()
{
int c=year/100; // # of centuries
int d=year%100; // # of years through century
int m=(month+10)%12; // # of month march is 1,feb is 12
int k=1; // set the day part to 1 so we get back the day for first of month
if ((month==1)||(month==2))// treat jan and feb as if they were in previous year
{
if (d==0) // if d is 0 then to go back a year d becomes 99 and c become c-1
{
d=99;
c-=1;
}
else
{
d-=1; // jan and feb are treated as previous year
}
}
float g=(k + (floor(((13*m)-1)/5)) + d + (floor(d/4)) + (floor(c/4)) - (2*c));
int f=static_cast<int>(g)%7; // cast result of algorithm to int to take modulus
if (f<0) // if negative add 7
{
f+=7;
}
return f; // returns 0 to 6 corresponding to sunday to saturday
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// void printcalender()
//
// prints the calender for the entered date
//
//////////////////////////////////////////////////////////////////////////////////////////////
void calender:rintcalender()
{
clrscr();
cout<<"Date entered was :- "<<day<<"/"<<month<<"/"<<year<<endl;
cout<<endl<<setw(8)<<"SUNDAY"<<setw(8)<<"MONDAY"<< setw(9)<<"TUESDAY"<<setw(11)<<"WEDNESDAY"<<setw(10 )
<<"THURSDAY"<<setw(8)<<"FRIDAY"<<setw(10)<<"SATURD AY"<<endl;
int startday=whatdayisfirstofmonth();
int endday=howmanydays();
for (int i=0;i<startday;i++)
{
if (i==0)
{
gotoxy(4,4);
cout<<"-";
}
if (i==1)
{
gotoxy(12,4);
cout<<"-";
}
if (i==2)
{
gotoxy(21,4);
cout<<"-";
}
if (i==3)
{
gotoxy(31,4);
cout<<"-";
}
if (i==4)
{
gotoxy(42,4);
cout<<"-";
}
if (i==5)
{
gotoxy(50,4);
cout<<"-";
}
} // end of for loop
int rows=4;
int count=1;
for(int j=startday;j<(startday+endday);j++)
{
if(j%7==0)
{
rows+=2;
gotoxy(4,rows);
}
if(j%7==1) gotoxy(12,rows);
if(j%7==2) gotoxy(21,rows);
if(j%7==3) gotoxy(31,rows);
if(j%7==4) gotoxy(42,rows);
if(j%7==5) gotoxy(50,rows);
if(j%7==6) gotoxy(60,rows);
if(count==day) // set text to bright red if count is the day entered
{
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HA NDLE),FOREGROUND_INTENSITY|FOREGROUND_RED);
}
else
{
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HA NDLE),FOREGROUND_INTENSITY|FOREGROUND_RED|FOREGROU ND_BLUE|FOREGROUND_GREEN);
}
cout<<count;
count ++;
} // end of for loop
cout<<endl<<endl<<endl;
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// void clrscr()
//
// clears the console window
//
//////////////////////////////////////////////////////////////////////////////////////////////
void clrscr()
{
COORD coordScreen = { 0, 0 };
DWORD cCharsWritten;
CONSOLE_SCREEN_BUFFER_INFO csbi;
DWORD dwConSize;
HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
GetConsoleScreenBufferInfo(hConsole, &csbi);
dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
FillConsoleOutputCharacter(hConsole, TEXT(' '), dwConSize, coordScreen, &cCharsWritten);
GetConsoleScreenBufferInfo(hConsole, &csbi);
FillConsoleOutputAttribute(hConsole, csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten);
SetConsoleCursorPosition(hConsole, coordScreen);
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// void gotoxy(int x,int y)
//
// moves cursor to x,y in windows console
//
//////////////////////////////////////////////////////////////////////////////////////////////
void gotoxy(int x, int y)
{
COORD point;
point.X = x; point.Y = y;
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_H ANDLE),point);
}
//////////////////////////////////////////////////////////////////////////////////////////////
//
// int main()
//
// entry point for program
//
// returns 0 back to the OS
//
//////////////////////////////////////////////////////////////////////////////////////////////
int main()
{
while (1)
{
clrscr();
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HA NDLE),FOREGROUND_INTENSITY|FOREGROUND_RED|FOREGROU ND_BLUE|FOREGROUND_GREEN);
cout<<"Welcome to the gregorian calender calculator. v.1.00"<<endl<<endl
<<"Use UK format.... day/month/full year. Use the '/' char to delimit your entry..."
<<endl<<endl;
cout<<"Please enter the date you would like to see the calender for :- ";
char input_day[4];
char input_month[4];
char input_year[6];
cin.getline(input_day,3,'/'); // get the input as strings
cin.getline(input_month,3,'/');
cin.getline(input_year,5,'\n');
cout<<endl;
int d=atoi(input_day); // convert input to integer
int m=atoi(input_month);
int y=atoi(input_year);
calender date(d,m,y); // instantiate the calender object
system("PAUSE"); // wait for a keypress
date.printcalender(); // print the calender
cout<<"Another calender (Y/N) ? ";
char input[5];
cin.getline(input,4);
if ((input[0]=='N') || (input[0]=='n'))
{
break; // drop out of while loop
}
} // end of while loop
return 0;
}
Thanks Stone coder
