CSI

CSC126

Spring 2007

Courtesy: Prof. L. Petingi

Find the Treasure

Switch, If, Loops

A treasure is hidden someplace ! The coordinates (x1,y1) are determined randomly, using the code that is listed at the end of this lab. The purpose of the game is for the Explorer to find the Treasure !

The explorer is allowed to go North, South, West or East. The Explorer is first positioned at location (30,30). If the explorer goes North, only the y coordinate is increased by 1. Similarly if the explorer goes South the y coordinate is decreased by 1. In the same fashion the x coordinate is increased or decreased by 1 depending if the explorer goes East

or West, respectively.

Each time the Explorer ‘moves’, the distance between the Explorer and the treasure is computed. Distance = sqrt((x-x1)*(x-x1)+(y-y1)*(y-y1))

When the Explorer’s position is the same as the Treasure’s position, the Explorer wins the Treasure !!

Procedures

1. You must use a LOOP

2. At the start of the loop, display the message "Please enter direction (n,s,e,w), or x to exit: ".

3. Now, get the position from the keyboard.

4. Update the Explorer’s coordinates

5. Calculate the distance from the explorer to the treasure:

Distance = sqrt(static_cast<double>((x-x1)*(x-x1)+(y-y1)*(y-y1)))

6. Display the distance from the Treasure (this information will clue the Explorer to either keep going in the same direction or switch directions).

7. Decisions……………

If the distance is greater than 8 then you display the message "you are too far from the treasure".

If the distance is greater than 4 and less or equal to 8 you display the message "you are far from the treasure".

If the distance is less or equal to 4 you display the message "you are getting closer to the treasure".

Also, check if you have reached the treasure (i.e., x=x1, and y=y1); and if so, Get out of the loop and display the message "congratulations, you have reached the treasure".

8. At the end of each loop display the message "Your location is: ( x,y); where x and y are the

Explorer’s coordinates

9. Make sure that you print out how many steps it took to reach the treasure

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#include <iostream>

#include <cstdlib>

#include <ctime>

#include <cmath>

Using namespace std;

int main ()

{

int x=30,y=30; // Explorer’s coordinates

int x1,y1; // Treasure’s coordinates

char dir='a';

float distance;

bool treasure=false;

srand(time(0)); // secretly seed the rand function !

x1=rand( ) %30 + 1; // x1 is randomly set to a number between 1 //and 30

y1=rand( ) % 30 + 1; // y1 is randomly set to a number between //1and 30;

//write loop to find the treasure