include #include #include #define hdr_3_across \"

#include<stdio.h> #include <conio.h> #include<process.h> #define hdr_3_across \"

ID: 3610958 • Letter: #

Question

#include<stdio.h>
#include <conio.h>
#include<process.h>

#define hdr_3_across " %.3s %.3s %.3s %s %s %s "
#define hdr_1_across " %s %u %s "

void badarg (i)
int i;
{
printf ("cal: bad argument '%d' ", i);
exit (0);
}

int number (str)
char *str;
{
register n, c;
register char *s;

n = 0;
s = str;
while (c = *s++) {
  if (c < '0' || c > '9')
   return (0);
  n = (n*10) + (c-'0');
}
return (n);
}

pstr (str, n)
char *str;
int n;
{
register int i;
register char *s;

s = str;
i = n;
while (i--) {   /* replace '' w/spaces*/
  if (*s == '')
   *s = ' ';
  ++s;
}
i = n + 1;
while (i--)   /* find last non-space char*/
  if (*--s != ' ')
   break;
*++s = ''; // EOS;
puts (str);
}

cal (m, y, p, w)
int m,y,w;
char *p;
{
register int d, i;
register char *s;

s = p;
d = jan1 (y);
mon[9] = 30;

switch ((jan1 (y+1)+ 7 - d) % 7) {
case 1:     /* rem non-leap year*/
  mon[2] = 28;
  break;
default:    /* 1752 */
  mon[9] = 19;
  /* fall thru */
case 2:     /* leap year */
  mon[2] = 29;
  break;
}
for (i = 1; i < m; ++i)
  d += mon[i];
d %= 7;
s += 3*d;
for (i = 1; i <= mon[m]; ++i) {
  if (i == 3 && mon[m] == 19) {
   i += 11;
   mon[m] += 11;
  }
  if (i > 9)
   *s = (i / 10) + '0';
  ++s;
  *s++ = (i % 10) + '0';
  ++s;
  if (++d == 7) {
   d = 0;
   s = p+w;
   p = s;
  }
}
}

/*
* return day of the week of jan 1 of given year
*/

int jan1 (yr)
int yr;
{
register int y, d;

/*
* normal gregorian calendar
* one extra day per four years
*/

y = yr;
d = 4 + y + ((y + 3) / 4);

/*
* julian calendar
* regular gregorian
* less three days per 400
*/

if (y > 1800){
d -= (y - 1701) / 100;
d += (y - 1601) / 400;
}

/*
* great calendar changeover instant
*/

if (y > 1752)
d += 3;

return (d % 7);
}

char *dayw = " S MTu W Th F S";

char *smon[] = { "",
"January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December"
};

int mon[] = { 0,
31,  29,  31,
30,  31,  30,
31,  31,  30,
31,  30,  31
};

#define WIDTH 72 /* max # of chars across for 3months */
#define LENGTH 6 /* max # of lines in 1 month'sdisplay */
#define BUFSIZE (LENGTH*WIDTH)

char string[BUFSIZE];

main(argc,argv)
int argc;
char *argv[];
{
register int y,m,j;

if (argc == 2){   /* display entire year */
  y = number (argv[1]);
  if (y < 1 || y > 9999)
   badarg (y);
  printf (" %u ", y);
  for (m = 1; m <= 12; m += 3) {
   setmem (string, BUFSIZE, '');
   printf (hdr_3_across,
       smon[m], smon[m+1], smon[m+2],dayw, dayw, dayw);
   cal (m, y, string, WIDTH);
   cal (m+1, y, string+23, WIDTH);
   cal (m+2, y, string+46, WIDTH);
   for (j=0; j < BUFSIZE; j += WIDTH)
    pstr (string+j, WIDTH);
  }
  putchar (' ');
}
else if (argc == 3) {   /* display 1 month*/
  m = number(argv[1]);
  if (m < 1 || m > 12)
   badarg (m);

  y = number(argv[2]);
  if (y < 1 || y > 9999)
   badarg (y);

Explanation / Answer

/************************************************** **************************Description: This program outputs a calendar for the year that the user inputs.If no year is given, then it randomly selects one from 1400 and 9999.************************************************** **************************/#include #include #include #include int getYear(); // has the user enter a valid yearbool isLeap(int year); // check for leap yearsvoid dayName(); // prints the names for the day of the weekvoid monthNameHeader(int year); // puts head for the month nameint startDay(int year); // decides what week day Jan starts onint monthCount(int counter); // how many days are in each monthvoid newMonth(int startDOW); // what day of the week new month starts onvoid printAll(int year); // puts everything together, prints to screenint year = 0; // uesr inputed year || rand gen per 0int counter = 1; // counter for month name & # days in monthint startDOW, // day of the week Jan starts onwrap, // check for if weekday is SaturdaydaysInMonth; // total days in each monthint weekNumber = 0; // flag for first week of the monthint main(){year = getYear(); // has user enter year numberprintAll(year);return 0;}int getYear() //prompts the user to enter a valid year{char c;srand(time(NULL));cout

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#include<stdio.h> #include <conio.h> #include<process.h> #define hdr_3_across \"

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