Answered: Problem: Feed Nibble Monster Till Full…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Problem: Feed Nibble Monster Till Full

Write a program that generates a number in [0, 500] at the beginning -- this corresponds to how hungry the monster is -- and keeps asking the user to feed the monster until that number falls to zero.

Each time the user feeds the monster a nibble, hunger decreases by the decimal value of the character (i.e. if the user feeds 'A' hunger decreases by 65). But when the user feeds the monster some character that isn't a nibble, the hunger increases by the decimal value of the character (since puking depletes energy).

Use while loop.

Sample runs:

Notice the loop exits after one iteration, because hunger was very low and one nibble made the monster full:

Notice hunger increasing after non-nibble (pink highlight):

Notice that the program just keeps going when the user feeds the monster only non-nibbles. Do you think the program will keep running forever if the user never gives the monster nibbles?

**Problem: Feed Nibble Monster Till Full**

Write a program that generates a number in [0, 500] at the beginning -- this corresponds to how hungry the monster is -- and keeps asking the user to feed the monster until that number falls to zero.

Each time the user feeds the monster a nibble, hunger decreases by the decimal value of the character (i.e., if the user feeds 'A', hunger decreases by 65). But when the user feeds the monster some character that isn't a nibble, the hunger increases by the decimal value of the character (since puking depletes energy).

Use a while loop.

**Sample runs:**

Notice the loop exits after one iteration, because hunger was very low and one nibble made the monster full:

```
$ java NibbleMonsterWithLoopTillFull
Monster hungry : E
H U N G E R: 2
Feed monster nibble : o
yum!
Monster full :).
You may go.
```

Notice hunger increasing after non-nibble (pink highlight):

```
$ java NibbleMonsterWithLoopTillFull
Monster hungry : E
H U N G E R: 384
Feed monster nibble : o
yum!
H U N G E R: 273
Feed monster nibble : z
Eww! o-O
H U N G E R: 395
Feed monster nibble : f
yum!
H U N G E R: 293
Feed monster nibble : o
yum!
H U N G E R: 192
Feed monster nibble : o
yum!
H U N G E R: 136
Feed monster nibble : o
yum!
H U N G E R: 70
Feed monster nibble : o
yum!
Monster full :).
You may go.
```

Notice that the program just keeps going when the user feeds the monster only non-nibbles. Do you think the program will keep running forever if the user never gives the monster nibbles?

```
$ java NibbleMonsterWithLoopTillFull
Monster hungry : E
H U N G E R: 89
Feed monster nibble : o
Eww! o-O
H U N G E R: 131
Feed monster nibble : o
Eww! o-O
H U N G E R: 169
Feed monster nibble : o
E

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