Programming Forums > Application Development > C++

lilmul123 · Apr 27th, 2006, 8:26 PM

ok, i'm almost done with my space invaders program, just one big detail i need to iron out. i want the "I" in my program (which is the weapon) to stop when it hits an alien. in the following code, you'll see as of yet I don't have any aliens, but i've tried many things. I've tried putting the aliens in an array, and then changing the for loop to say "locationybullet<=2||locationybullet==alien[0]" for example, but that didn't work. then i realized that i need to give the alien an xy location on the screen, but i dont know how to do this. can anyone help me on what i should do?

(Toggle Plain Text)

#include <conio.h>
#include <stdio.h>
#include <dos.h>
#include <iostream.h>


int main()
{
	char firstchoice,a,dir,begin,length;
	int locationx,locationy,same,score,locationxbullet,locationybullet;
	score=0;
	_setcursortype(_NOCURSOR);
	textcolor(YELLOW);
	textbackground(BLUE);
	locationx=40;
	locationy=24;
	locationxbullet=40;
	locationybullet=23;
	{
	clrscr();
	gotoxy(19,12);
	cout << "Welcome to Steve's Really Crappy Space Invaders Clone!";
	gotoxy(19,13);
	cout << "Press H for help.";
	gotoxy(19,14);
	cout << "Otherwise, Press any other key to continue.";
	firstchoice=getch();
	}

      if(firstchoice == 'h')

	{
		clrscr();
		cout << "You're a rogue space pilot on a mission to destroy other ASCII characters.\nYour score goes up by one by just shooting!\nThis game is impossible to lose.\nUse 4 to move left and 6 to move right.\nUse 6 to shoot.\nYou win when all the other ASCII characters are dead.\nGOOD LUCK!";
		getch();
	}
	else
	{
	clrscr();
	for(a=1;a<=79;a++)
	    {
		gotoxy(a,1);printf("X");
		gotoxy(a,25);printf("X");
	    }
	    for(a=2;a<=24;a++)
	    {
		gotoxy(1,a);printf("X");
		gotoxy(79,a);printf("X");
	    }
	    {
	    gotoxy(10,1);
	    printf("Score:0");
	    }

		do
	{

		if(kbhit() !=0)
		{
		dir=getch();

		if(dir=='4')
		{
		   gotoxy(locationx,locationy);
		   printf("  ^_^  ");
		   locationx--;
		   locationxbullet--;
		}
		if(dir=='6')
		{
		gotoxy(locationx,locationy);
		  printf("  ^_^  ");
		  locationx++;
		  locationxbullet++;
		  }
		if(dir=='8')
		{
		for(locationybullet=22;locationybullet>=2;locationybullet--)
		{
		delay(100);
		gotoxy(locationxbullet,locationybullet);
		printf("  I  ");
		gotoxy(locationxbullet,locationybullet+1);
		printf("     ");
		}

		{
		score++;
		gotoxy(10,1);
		cout << "Score:" << score;
		}
		}
		if(score==50)
		{
		clrscr();
		gotoxy(10,10);
		printf("YOU WIN!!! NICE FREAKING JOB.");
		gotoxy(10,11);
		printf("Press X to exit.");
		getch();
		}

	     }

	     }while(dir!='x');
	}
	}

BTW, you guys have been a real help to me. my computer teacher is impressed on how fast im learning this stuff.

The Dark · Apr 27th, 2006, 9:06 PM

One way would be to create a structure for the alien info. Something like:

(Toggle Plain Text)

struct Alien
{
  int x;
  int y;
};

and then declaring an Alien struct in your program :

(Toggle Plain Text)

Alien alien;

This will make it easier when you want to have more than one alien.

I don't know if you have done structures yet. If not, you could also just have

(Toggle Plain Text)

int alienX;
int alienY;

in your program, but that only allows for one alien and will get messy if you want to have more.

Then you can check for a hit using something like:

(Toggle Plain Text)

if (locationybullet==alien.y && locationxbullet==alien.x)

lilmul123 · Apr 27th, 2006, 9:18 PM

._. sadly, i have yet to do structures, but this intrigues me. can you go further into detail about what i should do? maybe ill get it

edit: ok, i think i understand now. but how do i declare mutliple aliens? i know i need to use an array, but how exactly do I declare that?

The Dark · Apr 27th, 2006, 9:25 PM

If you are using the Alien structure, the you can declare an array of aliens using

(Toggle Plain Text)

Alien aliens[10];

Where 10 gives the size of the array. You can then access the individual aliens using something like:

(Toggle Plain Text)

aliens[5].x = 40;

The part inside the square brackets tells which alien to acces. This starts from zero. The numbers in this case go from 0 to 9.

lilmul123 · Apr 27th, 2006, 9:27 PM

i notice you use just an x point in your example. i would declare the y point also in the exact same way, correct?

Apr 27th, 2006, 8:26 PM	#1
lilmul123 Newbie Join Date: Mar 2006 Posts: 22 Rep Power: 0	a question about making this stop ok, i'm almost done with my space invaders program, just one big detail i need to iron out. i want the "I" in my program (which is the weapon) to stop when it hits an alien. in the following code, you'll see as of yet I don't have any aliens, but i've tried many things. I've tried putting the aliens in an array, and then changing the for loop to say "locationybullet<=2\|\|locationybullet==alien[0]" for example, but that didn't work. then i realized that i need to give the alien an xy location on the screen, but i dont know how to do this. can anyone help me on what i should do? (Toggle Plain Text) #include <conio.h> #include <stdio.h> #include <dos.h> #include <iostream.h> int main() { char firstchoice,a,dir,begin,length; int locationx,locationy,same,score,locationxbullet,locationybullet; score=0; _setcursortype(_NOCURSOR); textcolor(YELLOW); textbackground(BLUE); locationx=40; locationy=24; locationxbullet=40; locationybullet=23; { clrscr(); gotoxy(19,12); cout << "Welcome to Steve's Really Crappy Space Invaders Clone!"; gotoxy(19,13); cout << "Press H for help."; gotoxy(19,14); cout << "Otherwise, Press any other key to continue."; firstchoice=getch(); } if(firstchoice == 'h') { clrscr(); cout << "You're a rogue space pilot on a mission to destroy other ASCII characters.\nYour score goes up by one by just shooting!\nThis game is impossible to lose.\nUse 4 to move left and 6 to move right.\nUse 6 to shoot.\nYou win when all the other ASCII characters are dead.\nGOOD LUCK!"; getch(); } else { clrscr(); for(a=1;a<=79;a++) { gotoxy(a,1);printf("X"); gotoxy(a,25);printf("X"); } for(a=2;a<=24;a++) { gotoxy(1,a);printf("X"); gotoxy(79,a);printf("X"); } { gotoxy(10,1); printf("Score:0"); } do { if(kbhit() !=0) { dir=getch(); if(dir=='4') { gotoxy(locationx,locationy); printf(" ^_^ "); locationx--; locationxbullet--; } if(dir=='6') { gotoxy(locationx,locationy); printf(" ^_^ "); locationx++; locationxbullet++; } if(dir=='8') { for(locationybullet=22;locationybullet>=2;locationybullet--) { delay(100); gotoxy(locationxbullet,locationybullet); printf(" I "); gotoxy(locationxbullet,locationybullet+1); printf(" "); } { score++; gotoxy(10,1); cout << "Score:" << score; } } if(score==50) { clrscr(); gotoxy(10,10); printf("YOU WIN!!! NICE FREAKING JOB."); gotoxy(10,11); printf("Press X to exit."); getch(); } } }while(dir!='x'); } } #include <conio.h> #include <stdio.h> #include <dos.h> #include <iostream.h> int main() { char firstchoice,a,dir,begin,length; int locationx,locationy,same,score,locationxbullet,locationybullet; score=0; _setcursortype(_NOCURSOR); textcolor(YELLOW); textbackground(BLUE); locationx=40; locationy=24; locationxbullet=40; locationybullet=23; { clrscr(); gotoxy(19,12); cout << "Welcome to Steve's Really Crappy Space Invaders Clone!"; gotoxy(19,13); cout << "Press H for help."; gotoxy(19,14); cout << "Otherwise, Press any other key to continue."; firstchoice=getch(); } if(firstchoice == 'h') { clrscr(); cout << "You're a rogue space pilot on a mission to destroy other ASCII characters.\nYour score goes up by one by just shooting!\nThis game is impossible to lose.\nUse 4 to move left and 6 to move right.\nUse 6 to shoot.\nYou win when all the other ASCII characters are dead.\nGOOD LUCK!"; getch(); } else { clrscr(); for(a=1;a<=79;a++) { gotoxy(a,1);printf("X"); gotoxy(a,25);printf("X"); } for(a=2;a<=24;a++) { gotoxy(1,a);printf("X"); gotoxy(79,a);printf("X"); } { gotoxy(10,1); printf("Score:0"); } do { if(kbhit() !=0) { dir=getch(); if(dir=='4') { gotoxy(locationx,locationy); printf(" ^_^ "); locationx--; locationxbullet--; } if(dir=='6') { gotoxy(locationx,locationy); printf(" ^_^ "); locationx++; locationxbullet++; } if(dir=='8') { for(locationybullet=22;locationybullet>=2;locationybullet--) { delay(100); gotoxy(locationxbullet,locationybullet); printf(" I "); gotoxy(locationxbullet,locationybullet+1); printf(" "); } { score++; gotoxy(10,1); cout << "Score:" << score; } } if(score==50) { clrscr(); gotoxy(10,10); printf("YOU WIN!!! NICE FREAKING JOB."); gotoxy(10,11); printf("Press X to exit."); getch(); } } }while(dir!='x'); } } BTW, you guys have been a real help to me. my computer teacher is impressed on how fast im learning this stuff.

Apr 27th, 2006, 9:06 PM	#2
The Dark Expert Programmer Join Date: Jun 2005 Posts: 893 Rep Power: 4	One way would be to create a structure for the alien info. Something like: (Toggle Plain Text) struct Alien { int x; int y; }; struct Alien { int x; int y; }; and then declaring an Alien struct in your program : (Toggle Plain Text) Alien alien; Alien alien; This will make it easier when you want to have more than one alien. I don't know if you have done structures yet. If not, you could also just have (Toggle Plain Text) int alienX; int alienY; int alienX; int alienY; in your program, but that only allows for one alien and will get messy if you want to have more. Then you can check for a hit using something like: (Toggle Plain Text) if (locationybullet==alien.y && locationxbullet==alien.x) if (locationybullet==alien.y && locationxbullet==alien.x)

Apr 27th, 2006, 9:25 PM	#4
The Dark Expert Programmer Join Date: Jun 2005 Posts: 893 Rep Power: 4	If you are using the Alien structure, the you can declare an array of aliens using (Toggle Plain Text) Alien aliens[10]; Alien aliens[10]; Where 10 gives the size of the array. You can then access the individual aliens using something like: (Toggle Plain Text) aliens[5].x = 40; aliens[5].x = 40; The part inside the square brackets tells which alien to acces. This starts from zero. The numbers in this case go from 0 to 9.

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Apr 27th, 2006, 9:18 PM	#3
lilmul123 Newbie Join Date: Mar 2006 Posts: 22 Rep Power: 0	._. sadly, i have yet to do structures, but this intrigues me. can you go further into detail about what i should do? maybe ill get it edit: ok, i think i understand now. but how do i declare mutliple aliens? i know i need to use an array, but how exactly do I declare that?

Apr 27th, 2006, 9:27 PM	#5
lilmul123 Newbie Join Date: Mar 2006 Posts: 22 Rep Power: 0	i notice you use just an x point in your example. i would declare the y point also in the exact same way, correct?

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Programming Forums > Application Development > C++

a question about making this stop