Programming and Problem Solving with Java

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10.Given the statements

String heading;

String str;

heading = “Exam Preparation Exercises”;

what is the output of each of the following code segments?

a.System.out.println(heading.length());

b.System.out.println(heading.substring( 6 , 16 ));

c. System.out.println(heading.indexOf(“Ex”));

d.str = heading.substring( 2 , 26 );

System.out.println(str.indexOf(“Ex”));

e.str = heading.substring(heading.indexOf(“Ex”) + 2 , 24 );

System.out.println(str.indexOf(“Ex”));

f. str = heading.substring(heading.indexOf(“Ex”) + 2 , heading.length());

System.out.println(str.indexOf(“Ex”));

11.Incorrectly formatting an application causes an error. (True or False?)

Programming Warm-Up Exercises

1.Change the application in Exam Preparation Exercise 6 so that it prints the cost

for 15 pounds.

2.Write an assignment statement to calculate the sum of the numbers from 1

through nusing Gauss’s formula:

sum=

Store the result into the intvariable sum.

3.Given the declarations

int i;

int j;

doublex;

doubley;

write a valid Java expression for each of the following algebraic expressions.

a. – 3 e. (the floating-point result)

b.(x+ y)(x– y) f. ij(the integer quotient)

i

j

x

y

n(n+ 1)

2