/**
 * Playing around with functions, conditionals, loops, and constants.
 * 
 * @author Sean Barker
 */
public class Lec3 {
    
    /**
     * The freezing point of water (in F).
     */
    private static final int FREEZING_POINT = 32;
    
    /**
     * The boiling point of water (in F).
     */
    private static final int BOILING_POINT = 212;

    /**
     * Given the temperature of water, return the state of the water
     * (solid, liquid, or gas).
     * 
     * @param temp The desired water temperature.
     * @return The state of the water at the given temperature.
     */
    public static String waterType(double temp) {
        if (temp <= FREEZING_POINT) {
            return "solid";
        } else if (temp <= BOILING_POINT) {
            return "liquid";
        } else {
            return "gas";
        }
    }
    
    /**
     * Returns whether a given int is positive (>0).
     * 
     * @param num The number to check.
     * @return Whether the number is greater than zero.
     */
    public static boolean isPositive(int num) {
        return num > 0;
    }
    
    
    /**
     * Find the index of the first occurrence of a letter in a word.
     * If the letter isn't found, returns -1.
     * 
     * @param word The word to search.
     * @param letter The letter to search for.
     * @return The index of letter in word, or -1 if the letter is not found.
     */
    public static int indexOfLetter(String word, char letter) {
        for (int i = 0; i < word.length(); i++) {
            if (word.charAt(i) == letter) {
                return i;
            }
        }
        return -1; // only reached if the letter isn't found
    }
    
    
    /**
     * Given a string, return a new string that is the reverse
     * of the original.
     * 
     * @param input The original string.
     * @return The reversed string.
     */
    public static String reverseString(String input) {
        String reversed = "";
        for (int i = input.length() - 1; i >= 0; i--) {
            reversed += input.charAt(i);
        }
        return reversed;
    }

}