DanDoBetterDrills-completed

MathUtilities.java

@@ -1,4 +1,3 @@
- 
 
 /**
  * Created by dan on 6/14/17.
@@ -11,7 +10,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Integer add(int baseValue, int difference) {
-        return null;
+        int finalVal= baseValue + difference;
+        return finalVal;
     }
 
     /**
@@ -20,7 +20,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Long add(long baseValue, long difference) {
-        return null;
+        long addedVal = baseValue + difference;
+        return addedVal;
     }
 
     /**
@@ -29,8 +30,11 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Short add(short baseValue, short difference) {
-        return null;
-    }
+        int num1= baseValue;
+        int num2= difference;
+        int sum= (num1)+(num2);
+        return (short)sum;
+    }   
 
     /**
      * @param baseValue  starting value
@@ -38,7 +42,10 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Byte add(byte baseValue, byte difference) {
-        return null;
+        int num1= baseValue;
+        int num2= difference;
+        int sum= (num1)+(num2);
+        return (byte)sum;
     }
 
     /**
@@ -47,7 +54,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Float add(float baseValue, float difference) {
-        return null;
+        float num1= baseValue + difference;
+        return num1;
     }
 
     /**
@@ -56,7 +64,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Double add(double baseValue, double difference) {
-        return null;
+        double num1=baseValue + difference;
+        return num1;
     }
 
     /**
@@ -65,7 +74,8 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Integer subtract(int baseValue, int difference) {
-        return null;
+        int sub1=baseValue-difference;
+        return sub1;
     }
 
     /**
@@ -74,7 +84,8 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Long subtract(long baseValue, long difference) {
-        return null;
+        long sub2=baseValue-difference;
+        return sub2;
     }
 
     /**
@@ -83,7 +94,10 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Short subtract(short baseValue, short difference) {
-        return null;
+        int num1=baseValue;
+        int num2=difference;
+        int sub3=(num1)-(num2);
+        return (short)sub3;
     }
 
     /**
@@ -92,7 +106,10 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Byte subtract(byte baseValue, byte difference) {
-        return null;
+        int num1=baseValue;
+        int num2=difference;
+        int sub3=(num1)-(num2);
+        return (byte)sub3;
     }
 
     /**
@@ -101,7 +118,8 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Float subtract(float baseValue, float difference) {
-        return null;
+        float sub4=baseValue-difference;
+        return sub4;
     }
 
     /**
@@ -110,17 +128,18 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Double subtract(double baseValue, double difference) {
-        return null;
+        double sub5=baseValue-difference;
+        return sub5;
     }
 
-
     /**
      * @param dividend value to be divided
      * @param divisor value to divide by
      * @return division of `dividend` by `divisor
      */
     public Integer divide(int dividend, int divisor) {
-        return null;
+        int div1= dividend/divisor;
+        return div1;
     }
 
     /**
@@ -129,7 +148,8 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Long divide(long dividend, long divisor) {
-        return null;
+        long div2= dividend/divisor;
+        return div2;
     }
 
     /**
@@ -138,7 +158,10 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Short divide(short dividend, short divisor) {
-        return null;
+        int num1=dividend;
+        int num2=divisor;
+        int div3=((num1)/(num2));
+        return(short)div3;
     }
 
     /**
@@ -147,7 +170,10 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Byte divide(byte dividend, byte divisor) {
-        return null;
+        int num1=dividend;
+        int num2=divisor;
+        int div3=((num1)/(num2));
+        return(byte)div3;
     }
 
     /**
@@ -156,7 +182,8 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Float divide(float dividend, float divisor) {
-        return null;
+        float div4= dividend/divisor;
+        return div4;
     }
 
     /**
@@ -165,17 +192,18 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Double divide(double dividend, double divisor) {
-        return null;
+        double div5= dividend/divisor;
+        return div5;
     }
 
-
     /**
      * @param multiplicand value to be multiplied
      * @param multiplier value to multiply by
      * @return product of `multiplicand` by `multiplier`
      */
     public Integer multiply(int multiplicand, int multiplier) {
-        return null;
+        int multi1= multiplicand* multiplier;
+        return multi1;
     }
 
     /**
@@ -184,7 +212,8 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Long multiply(long multiplicand, long multiplier) {
-        return null;
+        long multi2= multiplicand* multiplier;
+        return multi2;
     }
 
     /**
@@ -193,15 +222,22 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Short multiply(short multiplicand, short multiplier) {
-        return null;
+        int num1=multiplicand;
+        int num2=multiplier;
+        int multi3=((num1)*(num2));
+        return(short)multi3;
     }
+
     /**
      * @param multiplicand value to be multiplied
      * @param multiplier value to multiply by
      * @return product of `multiplicand` by `multiplier`
      */
     public Byte multiply(byte multiplicand, byte multiplier) {
-        return null;
+        int num1=multiplicand;
+        int num2=multiplier;
+        int multi4=((num1)*(num2));
+        return(byte)multi4;
     }
 
     /**
@@ -210,7 +246,8 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Float multiply(float multiplicand, float multiplier) {
-        return null;
+        float multi5=multiplicand*multiplier;
+        return multi5;
     }
 
     /**
@@ -219,22 +256,22 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Double multiply(double multiplicand, double multiplier) {
-        return null;
+        double multi6=multiplicand*multiplier;
+        return multi6;
     }
 
-
     /**
-      * @return true
+     * @return true
      */
     public Boolean returnTrue() {
-        return null;
+        return true;
     }
 
     /**
      * @return false
      */
     public Boolean returnFalse() {
-        return null;
+        return false;
     }
 
 }

PredicateUtilities.java

@@ -1,4 +1,3 @@
- 
 
 /**
  * Created by dan on 6/14/17.
@@ -10,7 +9,10 @@ public class PredicateUtilities {
      * @return true if `x` is greater than `y`
      */
     public Boolean isGreaterThan(int x, int y) {
-        return null;
+        if(x>y){
+            return true;
+        }
+        return false;
     }
 
     /**
@@ -19,7 +21,10 @@ public class PredicateUtilities {
      * @return true if `x` is less than `y`
      */
     public Boolean isLessThan(int x, int y) {
-        return null;
+        if(x<y){
+            return true;
+        } 
+        return false;
     }
 
     /**
@@ -28,7 +33,10 @@ public class PredicateUtilities {
      * @return true if `x` is greater than or equal to `y`
      */
     public Boolean isGreaterThanOrEqualTo(int x, int y) {
-        return null;
+        if(x>=y) {
+            return true;
+        }
+        return false;
     }
 
     /**
@@ -37,6 +45,9 @@ public class PredicateUtilities {
      * @return true if `x` is less than or equal to `y`
      */
     public Boolean isLessThanOrEqualTo(int x, int y) {
-        return null;
+        if(x<=y) {
+            return true;
+        }
+        return false;
     }
 }

StringUtilities.java

@@ -1,4 +1,3 @@
- 
 
 /**
  * Created by dan on 6/14/17.
@@ -8,7 +7,8 @@ public class StringUtilities {
      * @return `Hello World` as a string
      */
     public static String getHelloWorld() {
-        return null;
+        String greeting="Hello World";
+        return greeting;
     }
 
     /**
@@ -17,7 +17,8 @@ public class StringUtilities {
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public static String concatenation(String firstSegment, String secondSegment){
-        return null;
+        String concat=firstSegment+secondSegment;
+        return concat;
     }
 
     /**
@@ -26,7 +27,8 @@ public class StringUtilities {
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public static String concatenation(int firstSegment, String secondSegment){
-        return null;
+        String concat=firstSegment+secondSegment;
+        return concat;
     }
 
     /**
@@ -34,7 +36,10 @@ public class StringUtilities {
      * @return the first 3 characters of `input`
      */
     public static String getPrefix(String input){
-        return null;
+        if(input.length()<=3){
+            return input;
+        }
+        return (input.substring(0,3));
     }
 
     /**
@@ -42,7 +47,8 @@ public class StringUtilities {
      * @return the last 3 characters of `input`
      */
     public static String getSuffix(String input){
-        return null;
+        String str= input.substring(input.length() - 3);
+        return str;
     }
 
     /**
@@ -51,7 +57,8 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        Boolean val= inputValue.equals(comparableValue);
+        return val;
     }
 
     /**
@@ -59,15 +66,26 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public static Character getMiddleCharacter(String inputValue){
-        return null;
+        int value=0;
+        char middle=0;
+        
+        if(inputValue.length()%2==0){
+        value=(inputValue.length() / 2-1);
+        middle= inputValue.charAt(value);
+    } else {
+        value=(inputValue.length() / 2);
+        middle= inputValue.charAt(value);
     }
+    return middle;
+}
 
     /**
      * @param spaceDelimitedString a string, representative of a sentence, containing spaces
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
-        return null;
+       String arr[] = spaceDelimitedString.split(" ", 2);
+       return arr[0];
     }
 
     /**
@@ -75,7 +93,8 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public static String getSecondWord(String spaceDelimitedString){
-        return null;
+       String arr[] = spaceDelimitedString.split(" ", 2);
+       return arr[1];
     }
 
     /**
@@ -83,6 +102,7 @@ public class StringUtilities {
      * @return an identical string with characters in reverse order.
      */
     public static String reverse(String stringToReverse){
-        return null;
+        StringBuilder sb =new StringBuilder(stringToReverse);
+        return sb.reverse().toString();
     }
 }

package.bluej

@@ -1,18 +1,18 @@
 #BlueJ package file
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
-objectbench.height=129
-objectbench.width=1171
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=434
+editor.fx.0.y=23
+objectbench.height=128
+objectbench.width=835
 package.divider.horizontal=0.6
-package.divider.vertical=0.7490774907749077
-package.editor.height=399
-package.editor.width=1069
-package.editor.x=59
-package.editor.y=63
-package.frame.height=600
-package.frame.width=1195
+package.divider.vertical=0.7518382352941176
+package.editor.height=402
+package.editor.width=733
+package.editor.x=194
+package.editor.y=82
+package.frame.height=602
+package.frame.width=859
 package.numDependencies=0
 package.numTargets=6
 package.showExtends=true