1. Given a string of odd length, return the character in the middle of the strin

Question

1.Given a string of odd length, return the character in the middle of the string, so that "abc" yields 'b'.

middleChar("a") 'a'
middleChar("abc") 'b'
middleChar("abcde") 'c'

public char middleChar ( String str ) {

      int m = str.length( )/2;

}

Given a string of odd length, return the string of length 3 from its middle, so that "Peach" yields "eac". Assume that the str length will be at least 3.

"and"
middleThree("Peach") "eac"
middleThree("Student") "ude"

public String middleThree( String str ) {

}

Relational and Logical Operations

For the code below, give the printed values for each of the println statements.

Printed value

System.out.println( 7 > 2 );

System.out.println( 7 > = 2 );

System.out.println( 7 < 2 );

System.out.println( 7 < = 2 );

System.out.println( 7 = = 2 );

System.out.println( 7 ! = 2 );

System.out.println( true && true );

System.out.println( true && false );

System.out.println( true || false );

System.out.println( false || true && false );

System.out.println( false && true || false );

System.out.println( false || true && ! false );

System.out.println(   true && ! false );

Give a java expression for each of the following.

int num;

Java expression

num is less than 0

num is greater than or equal to 0 and less that 10

num is less than 0 or greater that 9

public char middleChar ( String str ) {

      int m = str.length( )/2;

}

Explanation / Answer

Question 1:

Here is code:

public class Testing {

public static void main(String[] args) {
System.out.println(middleChar("a"));
System.out.println(middleChar("abc"));
System.out.println(middleChar("abcde"));
}

public static char middleChar(String str) {
int m = str.length() / 2;
return str.charAt(m); // return the char at position
}
}

Output:

a
b
c

Question 2:

Here is code:

public class Testing {

public static void main(String[] args) {

System.out.println(middleThree("Peach"));

System.out.println(middleThree("Student"));

}

private static String middleThree(String str) {

int m = str.length() / 2;

if (str.length() > 2 && str.length() % 2 == 1) {

return (str.charAt(m - 1) + "" + str.charAt(m) + "" + str.charAt(m + 1)).toString();

}

return "";

}

}

Output:

eac

ude

Printed value

System.out.println( 7 > 2 );

true

System.out.println( 7 > = 2 );

true

System.out.println( 7 < 2  );

false

System.out.println( 7 < = 2  );

false

System.out.println( 7 = = 2  );

false

System.out.println( 7 ! = 2  );

true

System.out.println( true && true );

true

System.out.println( true && false );

false

System.out.println( true || false );

true

System.out.println( false || true && false );

false

System.out.println( false && true || false );

false

System.out.println( false || true && ! false );

true

System.out.println(   true && ! false );

int num;

Java expression

num is less than 0

num < 0

num is greater than or equal to 0 and less that 10

num >= 0 && num < 10

num is less than 0 or greater that 9

num < 0 || num > 9

Printed value

System.out.println( 7 > 2 );

true

System.out.println( 7 > = 2 );

true

System.out.println( 7 < 2  );

false

System.out.println( 7 < = 2  );

false

System.out.println( 7 = = 2  );

false

System.out.println( 7 ! = 2  );

true

System.out.println( true && true );

true

System.out.println( true && false );

false

System.out.println( true || false );

true

System.out.println( false || true && false );

false

System.out.println( false && true || false );

false

System.out.println( false || true && ! false );

true

System.out.println(   true && ! false );

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