Debasis Bhattacharjee

/* Birth Date Day Calculator — First self-designed program · 2002 */
#include <stdio.h>
#include <conio.h>

int dayOfWeek(int d, int m, int y) {
    static int t[] = {0,3,2,5,0,3,5,1,4,6,2,4};
    if (m < 3) y--;
    return (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7;
}

void main() {
    int d, m, y;
    char *days[] = {"Sunday","Monday","Tuesday","Wednesday",
                    "Thursday","Friday","Saturday"};
    clrscr();
    printf("\n ===== BIRTH DATE CALCULATOR =====\n");
    printf(" Enter Day   (DD)   : "); scanf("%d", &d);
    printf(" Enter Month (MM)   : "); scanf("%d", &m);
    printf(" Enter Year  (YYYY) : "); scanf("%d", &y);
    printf("\n The day was : %s\n", days[dayOfWeek(d,m,y)]);
    getch();
}

/* Discovering cprintf — the first coloured output · 2002 */
#include <stdio.h>
#include <conio.h>

void main() {
    clrscr();

    textcolor(CYAN);   textbackground(BLACK);
    cprintf("  Hello in CYAN on BLACK!        \r\n");

    textcolor(YELLOW); textbackground(BLUE);
    cprintf("  Hello in YELLOW on BLUE!       \r\n");

    textcolor(WHITE);  textbackground(RED);
    cprintf("  Hello in WHITE on RED!         \r\n");

    textcolor(BLACK);  textbackground(GREEN);
    cprintf("  Hello in BLACK on GREEN!       \r\n");

    textcolor(MAGENTA);textbackground(LIGHTGRAY);
    cprintf("  Hello in MAGENTA on LIGHTGRAY! \r\n");

    getch();
}

/* Mars Alien Chat Simulation · DOS Graphics · 2003 */
#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <graphics.h>

char *resp[] = {
    "Zrrk! Greetings, Earth creature.",
    "We have monitored your planet for 3000 cycles.",
    "Your gravity is... uncomfortable.",
    "Zrrk... does not compute."
};

void drawAlien(int x, int y) {
    setfillstyle(SOLID_FILL,GREEN); fillellipse(x,y,25,30);
    setcolor(RED);   circle(x-10,y-5,5); circle(x+10,y-5,5);
    setcolor(YELLOW);arc(x,y+8,190,350,12);
}

void respond(char *in) {
    if     (strstr(in,"hello")||strstr(in,"hi"))   printf("\n ALIEN> %s",resp[0]);
    else if(strstr(in,"mars")||strstr(in,"planet")) printf("\n ALIEN> %s",resp[1]);
    else if(strstr(in,"earth")||strstr(in,"gravity"))printf("\n ALIEN> %s",resp[2]);
    else                                               printf("\n ALIEN> %s",resp[3]);
}

void main() {
    char input[80];
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"C:\\TC\\BGI");
    drawAlien(320,120);
    getch(); closegraph();
    while(1){
        printf("\n YOU> "); gets(input);
        if(!strcmp(input,"bye")) break;
        respond(input);
    }
}

/* DebB Paint — DOS Paint App · 2004
   Draw, Fill, Emboss, Engrave, Color Picker, Toolbox */
#include "gcpp.h"
#include "gcpp2.h"
#include <dos.h>
#define TOOL_RECT   1
#define TOOL_CIRC   2
#define TOOL_FILL   3
#define TOOL_EMBOSS 4
#define TOOL_ENGRAV 5

int curTool=TOOL_RECT, curColor=WHITE;

void emboss(int x1,int y1,int x2,int y2) {
    setcolor(WHITE);    line(x1,y1,x2,y1); line(x1,y1,x1,y2);
    setcolor(DARKGRAY); line(x1,y2,x2,y2); line(x2,y1,x2,y2);
}
void engrave(int x1,int y1,int x2,int y2) {
    setcolor(DARKGRAY); line(x1,y1,x2,y1); line(x1,y1,x1,y2);
    setcolor(WHITE);    line(x1,y2,x2,y2); line(x2,y1,x2,y2);
}
void drawPalette() {
    int i,cols[]={BLACK,BLUE,GREEN,CYAN,RED,MAGENTA,
                   BROWN,LIGHTGRAY,DARKGRAY,YELLOW,WHITE,
                   LIGHTBLUE,LIGHTGREEN,LIGHTCYAN,LIGHTRED,LIGHTMAGENTA};
    for(i=0;i<16;i++){
        setfillstyle(SOLID_FILL,cols[i]);
        bar(10+i*20,getmaxy()-28,28+i*20,getmaxy()-10);
    }
}

void main() {
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"C:\\TC\\BGI");
    drawWindow(0,0,getmaxx(),getmaxy(),"DebB Paint v1.0");
    drawPalette();
    /* Full event loop: mouse click → tool action → draw → fill... */
    getch(); closegraph();
}