22: Seach an Element from an Array Explain in detail in English how the following search method works? public static int search(int aNum, int[] X) int n = X.length; int i-0; while(isn && X[i] ! aNum) i+; if(i n) return -1; //It means not found else return i;

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
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Q2: How do you know it break down the loop? which one is control it? Telling the detail.
**Array's View, Search, and Update**

**Q1: Print an Array**

Explain in detail in English how the following `outputArr` method works.

```java
public static void outputArr(int[] X) {
    int n = X.length;
    for (int i = 0; i < n-1; i++)
        System.out.printf("%4d", X[i]);
    System.out.println(X[n-1]);
}
```

**Q2: Search an Element from an Array**

Explain in detail in English how the following search method works.

```java
public static int search(int aNum, int[] X) {
    int n = X.length;
    int i = 0;
    while (i < n && X[i] != aNum)
        i++;
    if (i == n) return -1;  // it means not found
    else return i;
}
```

**Q3: Update an Element**

Array:  
`2  4  6  8  10  12  14  16  18  -1`  
Indices:  
`0  1  2  3   4   5   6   7   8   9`

Write a Java statement to change the element 10 to 100.

**Q4: Insert an Element**

Array:  
`2  4  6  8  100  12  14  16  18  -1`  
Indices:  
`0  1  2  3   4    5   6   7   8   9`

If the last element (-1) means an empty cell, how do you insert 50 before the element 100? Write a set of Java code and explain it in English.

**Q5: Delete an Element**

Array:  
`2  4  6  8  50  100  12  14  16  18`  
Indices:  
`0  1  2  3   4   5    6   7   8   9`

How do you delete the element 4 from the above array? Write a set of Java code and explain it in English.
Transcribed Image Text:**Array's View, Search, and Update** **Q1: Print an Array** Explain in detail in English how the following `outputArr` method works. ```java public static void outputArr(int[] X) { int n = X.length; for (int i = 0; i < n-1; i++) System.out.printf("%4d", X[i]); System.out.println(X[n-1]); } ``` **Q2: Search an Element from an Array** Explain in detail in English how the following search method works. ```java public static int search(int aNum, int[] X) { int n = X.length; int i = 0; while (i < n && X[i] != aNum) i++; if (i == n) return -1; // it means not found else return i; } ``` **Q3: Update an Element** Array: `2 4 6 8 10 12 14 16 18 -1` Indices: `0 1 2 3 4 5 6 7 8 9` Write a Java statement to change the element 10 to 100. **Q4: Insert an Element** Array: `2 4 6 8 100 12 14 16 18 -1` Indices: `0 1 2 3 4 5 6 7 8 9` If the last element (-1) means an empty cell, how do you insert 50 before the element 100? Write a set of Java code and explain it in English. **Q5: Delete an Element** Array: `2 4 6 8 50 100 12 14 16 18` Indices: `0 1 2 3 4 5 6 7 8 9` How do you delete the element 4 from the above array? Write a set of Java code and explain it in English.
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