inzikind - 1 year ago 72
Java Question

# Prime Number Java

This is for homework and I have most of it but I feel like my prime number generator is off because when i run it, it only increases the Y value by 5 for 1 and 3 not all the other primes between 1 and 100;

heres the homework question

``````It's Joen's Birthday and his friends have hidden his gift somewhere in his       house.

Joen begins at the origin: (0,0)

He has to follow 100 commands. The first being command 1, the second being command 2, etc.

Only one of the following can be applied at once.

-If the command number is both prime and odd, he must take 5 steps ahead (up)
-Otherwise if the command number is both prime and even, he must take 3 steps backwards (down)
-Otherwise if the command number is even, he must take one step to the right.
-Otherwise if the command number is odd, he must take one step to the left

The following rule can be applied in addition to another rule
-If the command number is divisible by 7, he must take the quotient number of steps down.

Using a coordinate system, at what point is the gift hidden? Create a program that shows the steps Joen takes to find his hidden gift.
``````

and here is what i have for code

``````import java.util.*;

public class Party{
public static void main(String[] args) {

int counterCommand = 1;
int x = 0;
int y = 0;
int temp;
boolean isPrime=true;
while (counterCommand <= 100) {
int num=counterCommand;
for(int i=2;i<=num/2;i++){
temp=num%i;
if(temp==0){
isPrime=false;
break;}
}

if (isPrime==true){
if (counterCommand % 2 != 0){
y = y + 5;
}
else {
y = y - 3;
}
}
else{
if (counterCommand % 2 != 0){
x = x - 1;
}
else{
x = x + 1;
}

}
counterCommand = counterCommand + 1;
}
System.out.print(x + "," + y);
}
}
``````

how ever when i run it, the value for Y is not increasing at any Prime odds that are not one or 3 (5,7,13 ect) Why is that? Because i know that the 1,7 Im getting is not correct