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IS142 LAB WORKSHEET FOR WEEK 5
Java Programming Tutorial
1
...
1 Exercises on Conditional (Decision)
Exercise 1
...
Hints:
public class CheckPassFail { // saved as "CheckPassFail
...
out
...
) {
System
...
println(
...
out
...
);
}
}
}
Exercise 1
...
Hints: n is an even number if (n % 2) is 0
...
java"
public static void main(String[] args) {
int number = 49;
// set the value of number here!
System
...
println("The number is " + number);
if (
...
out
...
);
} else {
System
...
println(
...
3a: PrintNumberInWord (nested-if, switch-case): Write a program
called PrintNumberInWord which prints "ONE", "TWO",
...
, 9, or other, respectively
...
Hints:
public class PrintNumberInWord {
// saved as "PrintNumberInWord
...
out
...
) {
1
IS142 LAB WORKSHEET FOR WEEK 5
...
) {
...
} else {
...
out
...
...
default: System
...
println("OTHER");
}
}
}
Exercise 1
...
“Saturday” if the int variable "day" is 0, 1,
...
Otherwise, it shall print
“Not a valid day”
...
2 Exercises on Loop (Iteration)
Exercise 1
...
1a SumAndAverage (Loop): Write a program called SumAndAverage to
produce the sum of 1, 2, 3,
...
g
...
Also compute and display the
average
...
5
Hints:
public class SumAndAverage {
// saved as "SumAndAverage
...
e
...
e
...
Beware that int/int produces int
...
// Print sum and average
...
}
}
Exercise 1
...
1b TRY:
Modify the program to use a "while-do" loop instead of "for" loop
...
2
...
Modify the program to use a "do-while" loop
...
What is the difference between "for" and "while-do" loops? What is the difference
between "while-do" and "do-while" loops?
1
...
3
...
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
Your program should use only two output statements, one EACH of the followings:
System
...
print("# ");
System
...
println();
// print # and a space, without newline
// print a newline
Hints:
public class SquareBoard {
// saved as "SquareBoard
...
) {
for (int col = 1;
...
}
...
Exercises on Keyboard and File Input
Exercise 2
...
The output shall look
like (the inputs are shown in bold):
Enter an integer: 12
Enter a floating point number: 33
...
44 is 45
...
util
...
in)
Scanner in = new Scanner(System
...
out
...
nextInt();
// use nextInt() to read int
System
...
print("Enter a floating point number: ");
num2 = in
...
out
...
next();
// use next() to read String
// Display
...
close();
}
}
Exercise 2
...
txt", and produce the following
output:
The integer read is 12
The floating point number read is 33
...
44 is 45
...
txt" (in Eclipse, right-click on the "project" ⇒ "New" ⇒
"File") with the following contents:
12
33
...
util
...
io
...
io
...
txt"));
num1 = in
...
nextDouble();
// use nextDouble() to read double
name = in
...
in
...
3:
CircleComputation (User
Input): Write
a
program
called CircleComputation, which prompts user for a radius (of double) and compute
the area and perimeter of a circle
...
2
The area is 4
...
5398223686155035
Hints: π is kept in a constant called Math
...
5