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CSE142 Sample Programs handout #12
Sample Program Numbers.java
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// Stuart Reges
// 4/26/06
//
// Sample program to demonstrate cumulative sum, a fencepost loop,
// counting and the use of a boolean flag and a complex boolean test.
import java.util.*;
public class Numbers {
public static void main(String[] args) {
Scanner console = new Scanner(System.in);
System.out.println("This program reads some ints");
System.out.println("and reports some stats");
System.out.println();
int sum = 0;
int count = 0;
int next;
boolean twoDigitSeen = false;
System.out.print("next int (-1 to quit)? ");
next = console.nextInt();
while (next != -1) {
sum += next;
count++;
if (next >= 10 && next <= 99) {
twoDigitSeen = true;
}
System.out.print("next int (-1 to quit)? ");
next = console.nextInt();
}
double average = (double) sum / (double) count;
System.out.println("average = " + average);
if (twoDigitSeen) {
System.out.println("at least one 2-digit number");
} else {
System.out.println("no 2-digit numbers");
}
}
}
Sample Log of Execution for SimpleGuess
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This program plays a guessing game with you.
I'm thinking of a number between 1 and 10.
Your guess? 5
Your guess? 3
Your guess? 7
Your guess? 9
Your guess? 2
Your guess? 1
Your guess? 8
Your guess? 4
Your guess? 10
Your guess? 6
You got it right in 10 guesses
Another Sample Log of Execution
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This program plays a guessing game with you.
I'm thinking of a number between 1 and 10.
Your guess? 8
Your guess? 6
Your guess? 2
You got it right in 3 guesses
Program File SimpleGuess.java
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// Stuart Reges
// 10/25/04
//
// This program plays a simple guessing game with the user.
import java.util.*;
public class SimpleGuess {
public static void main(String[] args) {
giveIntro();
Scanner console = new Scanner(System.in);
Random r = new Random();
int guesses = 0;
int number = r.nextInt(10) + 1;
int guess = -1;
while (guess != number) {
guesses++;
System.out.print("Your guess? ");
guess = console.nextInt();
}
System.out.println();
System.out.println("You got it right in " + guesses + " guesses");
}
// explains the program to the user
public static void giveIntro() {
System.out.println("This program plays a guessing game with you.");
System.out.println("I'm thinking of a number between 1 and 10.");
System.out.println();
}
}
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