Thread: Sin() and Cos() Problem

I'm trying to make basically just the game snake. I'm using the Allegro graphics library. I'm trying to use sin and cos to find the direction the snake should go, but I keep getting the error 'sin': ambiguous call to overloaded function. I don't know what that means or what the problem is. But here's my code:

Code:

//Includes
#include <allegro.h>
#include<iostream>
#include<string>
#include <stdlib.h>
#include <stdlib.h> 
#include <cstdlib>
#include <time.h>
#include <vector>
#include <complex>
#include <math.h>



//Graphics
BITMAP *snakeimg = NULL;
BITMAP *buffer = NULL;

//Sounds

//Variables
int x,y;
int dir = 0;
int dx = sin(dir);
int dy = cos(dir);


//Structs
struct snake{
	int x;
	int y;
};

struct fruit{
	int x;
	int y;
};

//Vectors
vector<snake> snakes(0);

//Functions
void UpdateSnake();

int main(int argc, char argv[1])
{
	using namespace std;
	allegro_init();
	install_keyboard();
	set_color_depth(24);
	set_gfx_mode(GFX_AUTODETECT_WINDOWED,400,400,0,0);

	//BITMAPS
	snakeimg = load_bitmap("Snake.bmp",NULL);
	buffer = create_bitmap(400,400);

	while(!key[KEY_ESC])
	{
	UpdateSnake();
	draw_sprite(screen,buffer,0,0);
	}

	allegro_exit();
	return 0;

	//Cleanup
	for(int i = 0;i < snakes.size();
	{
		snakes.erase(snakes.begin()+i);
	}
}

	destroy_bitmap(snakeimg);
	destroy_bitmap(buffer);
END_OF_MAIN();

void UpdateSnake()
{
	dx = Sin(dir);
	dy = Cos(dir);
	x = x + dx;
	y = y + dy;

	draw_sprite(buffer,snakeimg,x,y);
}

Please help if you have any idea what the problem is. I'm pretty sure I have the right include file.

It should be sin, not Sin, and sin takes radians as a floating point value. The compiler cannot figure out whether you want the sin that works with double, float, or long double.

Oh I see. I changed all the variables to floats and it works now, except that the snake only moves if dir=0. otherwise, the snake just sits there.

I did a lot of copy and paste with the includes. I must have done it on accident.