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Title Date and Time program with calender of any year > 1900
Author Tapan Kumar Mishra
Author Email titu_igit [at] rediffmail.com
Description It takes the time from bios data area 0x46c,and uses int 22h to find the scan codes of arrow keys for changing the calender
Category C » Hardware Interaction Through C
Hits 13040
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Code : /*Coded by Tapan Kumar Mishra Electrical Engg. IGIT Sarang For any querry Email:titu_igit@rediffmail.com Date of Submission:5.11.2005 */ #include<stdio.h> #include<dos.h> #include<conio.h> /********************************************** Global Variables ***********************************************/ struct date d; int currentday,currentmon,currentyear; unsigned long far *t=MK_FP(0X40,0X6C); unsigned char far *scr=MK_FP(0XB800,0); /********************************************** Function Prototype Declaration ***********************************************/ void writechar(char c,int row,int col,char attr); long int curtime(void); void showcale(int,int); unsigned char getkey(void); /*********************************************** Function to Scan the Scan code of the arrow keys ************************************************/ unsigned char getkey(void) { char c; if(kbhit()) { asm xor ah,ah; asm int 22; asm mov c,ah; return c; } return 0; } void main() { int year,i,m; char c; getdate(&d); //function which gives the current date year=d.da_year; currentyear=year; m=(int)d.da_mon; currentmon=m; currentday=(int)d.da_day; showcale(year,m); for(;;) {curtime(); i=(int)getkey(); if(i==16) exit(); if(i==72) showcale(++year,m); if(i==80) showcale(--year,m); if(i==75) { if(--m==0) {m=12;year--;} showcale(year,m); } if(i==77) { if(++m==13) {m=1;year++;} showcale(year,m); } } } /********************************************** showcale() Print The calender ***********************************************/ void showcale(int year,int m) { int date[]={31,28,31,30,31,30,31,31,30,31,30,31}; int i,d=0; char *month[]={"January","February", "March","April","May", "June","July","August", "September","October", "November","December"}; if(year%4==0&&year%100!=0||year%400==0) //to check the year leap or not date[1]=29; //to calculate the 1st day of the year for(i=1900;i<year;i++) if(i%4==0&&i%100!=0||i%400==0) d=d+2; else d=d+1; //to calculate the 1st day of the month of the corresponding year for(i=0;i<m-1;i++) d=d+date[i]; //to print the calender of the month; clrscr(); printf(" %s %d ",month[m-1],year); printf("Mon Tue Wed Thu Fri Sat Sun "); for(i=0;i<d%7;i++) printf(" "); for(i=1;i<=date[m-1];i++) { if((i+d)%7==0) printf("%d ",i); else printf("%d ",i); } gotoxy(65,3); printf("Date:%2d/%2d/%4d",currentday,currentmon,currentyear); gotoxy(5,15); printf("Coded by Tapan Kumar Mishra Electrical Engg."); printf(" IGIT Sarang Orissa Email:titu_igit@rediffmail.com"); gotoxy(30,23); printf("USE THE ERROW KEYS TO CHANGE THE YEAR AND MONTH"); printf(" PRESS 'Q' TO QUIT"); } /********************************************** the function curtime() prints and return the current time ***********************************************/ long int curtime(void) { unsigned long m,s,h,ph; char status='A'; m=*t/1092; s=(*t-m*1092)/18.2; h=m/60; ph=h; m=m-h*60; if(h>=12) { status='P'; if(h>12) ph-=12; } writechar(48+(char)ph/10,0,69,122); writechar(48+(char)ph%10,0,70,122); writechar(':',0,71,122); writechar(48+(char)m/10,0,72,122); writechar(48+(char)m%10,0,73,122); writechar(':',0,74,122); writechar(48+(char)s/10,0,75,122); writechar(48+(char)s%10,0,76,122); writechar(32,0,77,122); writechar(status,0,78,122); writechar('M',0,79,122); return 0; } /********************************************** The function writechar() writes the character directly to the VDU ***********************************************/ void writechar(char c,int row,int col,char attr) { *(scr+row*160+col*2)=c; *(scr+row*160+col*2+1)=attr; } //End of code

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