[Information Processing Technician Practical] Key Contents of the 3rd Session in 2021 (2)

※ If there is a source for each content, a link is provided within the related content.

? Obtain Java output

Operator ^ ➡ exclusive OR

public class testco {
public static void main(String[] args) {
int a = 3, b = 4, c = 3, d = 5;
if((a == 2 | a == c) & !(c > d) & (1 == b ^ c != d)) {
a = b + c;
if(7 == b ^ c != a) {
System.out.println(a);
} else {
System.out.println(b);
}
} else {
a = c + d;
if(7 == c ^ d != a) {
System.out.println(a);
} else {
System.out.println(d);
}
}
}
}

Here the first if statement matches TRUE ( a==2 | a==c ) in a==c !( c>d ) & ( 1==b ^ c!=d ) in c
Substitute the value of a as the sum of b+c as 7
In the second if statement, c does not match a, so it is TRUE
As a result System.out.println(a); ➡ Prints 7.

? Obtain C output value

**arr is a double pointer and points to the value *arr[0], so it becomes 12.

So *arr[1] + **arr + 1 = 37

? SQL

CROSS JOIN creates m*n rows. Here, there are 2 NAMEs starting with s% according to the RULE conditions of T2, and 2 NAMEs belonging to trk in the middle with %t%, making a total of 4.

? Python output

100 and 200 are inconsistent values. Therefore, it outputs False.

? UML 다이어그램

Use Case Diagram - Depicts the system's interactions with the outside world during the requirements analysis process.

Acitivy diagram - models the flow of work or expresses the life cycle of an object

Sequence diagram - Analyzing message passing between objects in time flow

Collaboration diagram - Creation centered on messages exchanged between objects

Class diagram - depicts the structural appearance of the system, represents the domain structure, describes concepts and abstract concepts within the domain, and includes properties and methods.

Component diagram – depicts the software structure

Deployment diagram - depicts the composition of the corporate environment and the relationships between components

? 객체지향 디자인패턴

Creation pattern

Builder - A pattern that encapsulates the creation phase and uses the same construction process.
Prototype - A pattern that allows you to create a new object by cloning an existing object.
Factory Method - A pattern that defines an interface that creates an object in a parent class and then creates an instance in a child class.
Abstract Factory - A pattern that brings together a set of products and lets you choose between factories.
Singleton Singleton - a pattern that ensures only one instance.

structural pattern

Adapter - A pattern that allows classes that cannot be used together due to interfaces to be used together.
Bridge - A pattern that reduces the degree of coupling by separating abstraction and implementation
Decorator Decorator - a pattern that extends functionality without changing the source.
Facade - A pattern that provides loose coupling through a single interface.
Flyweight - Pattern for sharing large numbers of small objects
Proxy - A pattern in which a delegate handles the work for you.
Composite - A pattern that allows both individual and composite objects to be used equally by clients.

Behavior pattern

Interpreter - Pattern that uses language rule classes
Template Method - A pattern that defines the structure of the algorithm skeleton.
Chain of Responsibility - A pattern that creates a link between objects and passes them on internally.
Command Command - A pattern that encapsulates the request itself and passes it as a parameter.
Iterator - A pattern that iterates without showing the internal representation.
Mediator - a pattern that encapsulates interactions between objects.
Memento - A pattern that stores state values in advance and then restores them.
Observer - A pattern that notifies and automatically updates dependents when state changes.
State - A pattern that changes behavior depending on the internal state of an object.
Strategy - A pattern that encapsulates various algorithms to enable algorithm replacement.
Visitor - a pattern that newly defines operations in a separate class

? C output value

#include
struct jsu {
char nae[12];
int os, db, hab, hhab;
};
int main(){
struct jsu st[3] = {{"데이터1", 95, 88},
{"데이터2", 84, 91},
{"데이터3", 86, 75}};
struct jsu* p;
p = &st[0];
(p + 1)->hab = (p + 1)->os + (p + 2)->db;
(p + 1)->hhab = (p+1)->hab + p->os + p->db;
printf("%d\n", (p+1)->hab + (p+1)->hhab);
}

The problem is to find the output value of C.

Here, if you look at the printf() value in main, p indicates the address value of the st array, and the word p+1 indicates the address value of st[1].

(p + 1)->hab = (p + 1)->os + (p + 2)->db;

Therefore, if you look at the (p+1)->hab part first, it is the sum of the values of os in the address value of st[1] and db in the address value of st[2]. Therefore, 84+75= 159.

(p + 1)->hhab = (p+1)->hab + p->os + p->db;

In this part, (p+1)->hab value 159 and the address value of st[0] means the sum of the value held by db in the address value of os and st[0]. Therefore, 159+95+88= 342.

So the resulting output value is 159+342= 501.

? File Structure File Structure

The file structure is a way in which the records that make up the file are organized in auxiliary memory, and the method varies depending on the access method. Among the access methods, there is a way to record records by sorting them in key-value order and organizing them by constructing an index that collects only the key items of the records. When referencing a record, you can refer to it directly using the address pointed to by the index. The file structure includes sequential access, index access, and hashing access.

? GUI

It refers to an environment in which users exchange information with a computer through graphics.

? Software integration testing

It is divided into bottom-up and top-down.

Bottom-up refers to a method in which testing proceeds from lower modules to higher modules. A test driver must be used, and there is a test stub that acts as an interface to the lower module and upper module.

Source: https://q.fran.kr/%EC%8B%9C%ED%97%98/%EC%A0%95%EB%B3%B4%EC%B2%98%EB%A6%AC%EA%B8%B0%EC%82%AC%20%EC%8B%A4%EA%B8%B0/2021%EB%85%84%203%ED%9A%8C