C++ Program to Identify the day on a particular date

C++ Program to  Identify the day on a particular date

#include<iostream.h>
#include<stdio.h> 
#include<conio.h> 
#define STD_DD 1 
#define STD_MM 1 
#define STD_YYYY 0001 
#define STD_DAY "Sunday" 
#define LEAP_YR 366 
#define NOT_LEAP 365 

unsigned int dd, mm, yyyy, y; 

void input(void); 
unsigned int select_days(unsigned int); 
void printday(unsigned int); 

void main(void) 
{ 
unsigned int daylimit, day = 1, d, m; 

clrscr(); 

cout<<" This program tells you the day of the date typed in.\n";

input();

for (y = STD_YYYY; y <= yyyy; y++)
{
for (m = 1; m <= 12; m++)
{
daylimit = select_days(m);

for (d = 1; d <= daylimit; d++)
{
if (day == 8)
day = 1;

if ((d == dd) && (m == mm) && (y == yyyy))
break;

++day;
}

if ((d == dd) && (m == mm) && (y == yyyy))
break;
}

if ((d == dd) && (m == mm) && (y == yyyy))
break;
}

cout<<endl;
cout<<"The day on the date "<<mm<<" "<< dd<<" "<<yyyy<<" is ";
printday(day);

getche();
}

void input(void) 
{ 
cout<<"\n Type in the date (mm dd yyyy) : ";
cin>>mm;
cin>>dd;
cin>>yyyy;

if ((mm <= 0) || (mm > 12))
{ 
do 
{ 
printf(" Type in the month again : "); 
scanf("%d",&mm); 
} 
while ((mm <= 0) || (mm > 12)); 
} 

if ((dd <= 0) || (dd > 31)) 
{ 
do 
{ 
printf(" Type in the day date again : "); 
scanf("%d",&dd); 
} 
while ((dd <= 0) || (dd > 31)); 
} 

if ((mm == 4) || (mm == 6) || (mm == 9) || (mm == 11) && (dd == 31)) 
{ 
printf(" Date can't be greater than 30 for this month!\n"); 

do 
{ 
printf(" Type in the day date again : "); 
scanf("%d",&dd); 
} 
while ((dd > 30) || (dd <= 0)); 
} 
else if ((mm == 2) && (dd > 29)) 
{ 
printf(" Date can't be greater than 29 for this month!\n"); 

do 
{ 
printf(" Type in the day date again : "); 
scanf("%d", &dd); 
} 
while ((dd > 29) || (dd <= 0)); 
} 

if ((yyyy % 4 != 0) && (mm == 2) && (dd == 29)) 
{ 
printf(" Date of 29 in the month 2 is only possible in the leap years!\n"); 

do 
{ 
printf(" Type in the day date again : "); 
scanf("%d", &dd); 
} 
while ((dd > 28) || (dd <= 0)); 
} 

if (yyyy <= 0) 
{ 
do 
{ 
printf(" Type in the year : "); 
scanf("%d",&yyyy); 
} 
while (yyyy <= 0); 
} 
} 

unsigned int select_days(unsigned int m) 
{ 
switch (m) 
{ 
case 2: 
if (y % 4 != 0) 
return(28); 
else 
return(29); 

case 1 : 
case 3 : 
case 5 : 
case 7 : 
case 8 : 
case 10: 
case 12: 
return(31); 

default: 
return(30); 
} 
} 

void printday(unsigned int day) 
{ 
switch (day) 
{ 
case 1: 
printf("Sunday.\n"); break; 
case 2: 
printf("Monday.\n"); break; 
case 3: 
printf("Tuesday.\n"); break; 
case 4: 
printf("Wednesday.\n"); break; 
case 5: 
printf("Thursday.\n"); break; 
case 6: 
printf("Friday.\n"); break; 
case 7: 
printf("Saturday.\n"); break; 
} 
} 

Posted in: C++ Programs