Daniel Lawson Java Chapter 3 Exercises 6-22 even

/**
 * Created by Daniel on 4/3/2016.
 */
//-------------------------------------------------------------------------------------------------------------------------------------
//ex6
public class largerAbsValue6 {
    public static void main(String[] args){
     System.out.println(largerAbsVal(-4,3)); // println statement to test method


    }
    public static int largerAbsVal(int value1, int value2){
     return Math.max(Math.abs(value1),Math.abs(value2));

    }
}
//-------------------------------------------------------------------------------------------------------------------------------------
//ex8
/**
 * Created by Daniel on 4/3/2016.
 */
public class quadratic8 {
    public static void main (String[] args){
        System.out.println(quadratic(1,-7,12)); // println statement to test method
    }
    public static String quadratic(int a, int b, int c){
      double xplus = (b*-1 + Math.sqrt((b*b)-(4*a*c)*1.0)) / 2*a ;
      double xminus = (b*-1 - (Math.sqrt((b*b)-(4*a*c)*1.0)) ) / 2*a ;
      String answer = "x = " + (int)xplus + "," + "x = " + (int)xminus;
      return answer;
    }
}

//-------------------------------------------------------------------------------------------------------------------------------------
//ex10
/**
 * Created by Daniel on 4/3/2016.
 */
public class area10 {
    public static void main (String[] args){
        System.out.println(area(2.0));
    }
    public static double area(double r){
        double area = Math.PI*(r*r);
        return area;

    }
}




//-------------------------------------------------------------------------------------------------------------------------------------
//ex12

/**
 * Created by Daniel on 4/3/2016.
 */
public class scientific12 {
    public static void main(String[] args){
        System.out.println(scientific(6.23,5)); // println statement to test method
    }
    public static double scientific (double n, int e){
        double answer = n * Math.pow(10.0,e);
        return answer;
    }
}


//-------------------------------------------------------------------------------------------------------------------------------------
//ex14
/**
 * Created by Daniel on 4/3/2016.
 */
public class cylinderSurfaceArea14 {
    public static void main(String[] args){
        System.out.println(cylinderSurfaceArea(3.0,4.5)); //println statement to test method
    }
    public static double cylinderSurfaceArea(double r,double h){
        double SA = (2*Math.PI*(r*r)) + (2*Math.PI*r*h);
        return SA;
    }
}



//-------------------------------------------------------------------------------------------------------------------------------------
//ex16
/**
 * Created by Daniel on 4/3/2016.
 */
public class triangleArea16 {
    public static void main(String[] args){
        System.out.println(triangleArea(8,5.2,7.1)); //println statement to test method
    }
    public static double triangleArea(double a, double b, double c){
        double s = (a + b + c)/2;
        double area = Math.sqrt( s*(s-a)*(s-b)*(s-c));
        return area;
    }
}


//-------------------------------------------------------------------------------------------------------------------------------------
//ex18
/**
 * Created by Daniel on 4/3/2016.
 */
public class vertical18 {
    public static void main(String[] args){
        vertical("hey now"); // calling the method to test it
    }
    public static void vertical(String letters){
        for(int i =1; i<= letters.length(); i++){
            System.out.println(letters.charAt(i-1));
        }
    }
}


//-------------------------------------------------------------------------------------------------------------------------------------
//ex20
/**
 * Created by Daniel on 4/3/2016.
 */

import java.util.*;

public class inputBirthday20 {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        inputBirthday(console);

    }

    public static void inputBirthday(Scanner con) {
        System.out.print("On what day of the month were you born?");
        String day = con.next();
        System.out.print("What is the name of the month in which you were born?");
        String month = con.next();
        System.out.print("During what year were you born?");
        String year = con.next();
        System.out.println("You were born on " + month + " " + day + ", " + year + ".");

    }
}




//-------------------------------------------------------------------------------------------------------------------------------------
//ex22
/**
 * Created by Daniel on 4/3/2016.
 */
//*note this program would have been MUCH easier with if statements instead of making for loops behave like them
import java.util.*;
public class CollegeAdmit22 {
    public static void main(String[] args){
        Scanner console = new Scanner(System.in);
        calcGPA(console);
    }
    public static void calcGPA(Scanner con){
        int gpaTruth = 0;
        int satTruth = 0;
        System.out.println("University admission program!");
        System.out.print("What is your GPA?");
        double gpa = con.nextDouble();
        System.out.print("What is your SAT score");
        double sat = con.nextDouble();
        //*note this program would have been MUCH easier with if statements instead of making for loops behave like them
        for(double i= gpa; i >= 1.8 && i>0; i -= i){ // test to see if gpa is passing
           gpaTruth = 1;
        }
        for(double j = sat;j >=900 && j >0;j-=j){ // test ot see if sat is passing
            satTruth = 1;
        }
        for(int i = 1; i == satTruth && i == gpaTruth;i = 0){ // if both are passing
            System.out.println("You were accepted");
        }
        for(int i = 0; i == satTruth || i == gpaTruth;i = 3){ // if one of them is not passing.
            System.out.println("You were not accepted"); // I originally used booleans instead of i=3, but then it would loop for ever
        }

    }
}