Question

Question 2: WRITE A C PROGRAMME TO Accept dates in ‘dd-mm-yyyy’ format into string variables and perform the following

1. Validate the given date
2. Find the difference between two dates
3. Find whether date d1 is earlier than or later than or equal to the date d2

Total Marks : 35 USE THE FOLLOWING GUIDLINES

String usage		10 marks
Control Structures usage		10 marks
Outputs	Format	2.5 marks
	Correctness	2.5 marks
Variables usage		marks

Answer 1

C code::

#include <stdio.h>
#include <stdbool.h>

//true if year is leap
bool isLeap(int y)
{
return (((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0));
}

// check date is valid
int validatedate(int d, int m, int y)
{
if((y < 9999) && (y >= 1800)) // change year limit
{
if((m >= 1) && (m <= 12)) // check month
{
if((d >= 1) && (d <= 31))
{
if(m == 2)
{
if(isLeap(y))
{
if(d > 29)
{
printf("Invalid day of feb");
return -1;
}
}
else
{
if(d > 28)
{
printf("Invalid day of feb");
return -1;
}
}
}

if(m == 4 || m == 6 ||
m == 9 || m == 11)
{
if(d > 30)
{
printf("Invalid day of 30days month");
return -1;
}
}
printf("Date is valid %d-%d-%d",d,m,y);
  
}
else
{
printf("Invalid day");
return -1;
}
}
else
{
printf("Invalid month");
return -1;
}
}
else
{
printf("Invalid year");
return -1;
}
return 0;
}

int dater(int m)
{
int y=0;
switch(m)
{
case 1: y=0; break;
case 2: y=31; break;
case 3: y=59; break;
case 4: y=90; break;
case 5: y=120; break;
case 6: y=151; break;
case 7: y=181; break;
case 8: y=212; break;
case 9: y=243; break;
case 10:y=273; break;
case 11:y=304; break;
case 12:y=334; break;
default: printf("Invalid Input");
return 1;
}
return(y);
}

int main(void) {

int d1,m1,y1;
int d2,m2,y2;
int dd,dd2,mm,yy;
int i;

printf("First a date(dd-mm-yyyy) : ");
scanf("%d-%d-%d",&d1,&m1,&y1);

printf("Second a date(dd-mm-yyyy) : ");
scanf("%d-%d-%d",&d2,&m2,&y2);

printf(" ");

if((validatedate(d1,m1,y1) == 0) && (validatedate(d2,m2,y2)) == 0)
{

if(y1 < y2)
yy = y1;
else
yy = y2;

dd = dater(m1);

for(i = yy ; i < y1 ; i++)
{
if(i % 4 == 0)
dd+=1;
}

dd=dd+d1+(y1-yy)*365;

dd2=0;

for(i = yy ; i < y2 ; i++)
{
if(i % 4 == 0)
dd2 += 1;
}

dd2=dater(m2)+dd2+d2+((y2-yy)*365);
i = 0;
if(dd2 > dd)
i = dd2 - dd;
else
i = dd - dd2;

printf("Difference between the two dates is %d days",i);

// find bigger date
if(y1 > y2)
printf("Date %d-%d-%d is bigger",d1,m1,y1);
else if (y1 == y2)
{
if(m1 == m2)
{
if(d1 == d2)
{
printf ("Date %d-%d-%d is equal to date %d-%d-%d",d1,m1,y1,d2,m2,y2);
}
else if(d1 > d2)
{
printf("Date %d-%d-%d is bigger",d1,m1,y1);
}
else
{
printf("Date %d-%d-%d is bigger",d2,m2,y2);
}
}
else if (m1 > m2)
{
printf("Date %d-%d-%d is bigger",d1,m1,y1);
}
else
{
printf("Date %d-%d-%d is bigger",d2,m2,y2);
}
}
else
{
printf("Date %d-%d-%d is bigger",d2,m2,y2);
}
}

return 0;
}

Output::