Gadget Tools

define trong lập trình c là gì

#define FOR(i,a,b) for (int i = a; i < b; i++)

#define for(i,n) for(int i=0;i<n; i++)

#define R1 return 1

#define CL(a,x) memset(x, a, sizeof(x));

#define filein freopen("in.txt","r",stdin)

#define pr(x) printf("Case %d: ",x) in m?t s? nguyên x b?ng cú pháp pr(x);
#define sc(n) scanf("%d",&n) nh?p m?t s? nguyên n b?ng cú pháp sc(n);
#define C1(x) cin >> x // gõ C1(x); có v? nhanh h?n cin >> x;
#define C2(x, y) cin >> x >> y // t??ng t? nh?ng nh?p 2 s?
#define C3(x, y, z) cin >> x >> y >> z // nh?p 3 s?

#define pb push_back

#define max(a, b) ((a) > (b) ? (a) : (b))

template <class T> inline T max(T a, T b){ return a > b ? a : b;}

tìm max 2 s? a và b thì ch? c?n dùng cú pháp max(a, b); là xong
template<class T>T sq(T a){ return (a*a); }
// tính a^2 b?ng cú pháp sq(a);
template<class T>T gcd(T a,T b){ return (b==0) ? a : gcd(b,a%b); }
// ??c s? chung l?n nh?t c?a 2 s? a, b b?ng cú pháp gcd(a, b);
template<class T>T lcm(T a,T b){ return (a/gcd(a,b))*b; }
// ……….nh? nh?t
template<class T>T Pow(T n,T p) { T res=n; for(T i=1;i<p; i++){ res *= n; } return res; }
// ch? là m?t hàm Pow thôi.
template<class T>bool isPrime(T n){ for(T i=2; i*i<=n; i++){ if(n%i==0) return false; } return true; }
// ki?m tra s? nguyên t?.
…………….. còn r?t nhi?u n?a và b?n có th? t? ngh? ra. tham kh?o thêm typedef
có th? m?t s? không c?n thi?t l?m nh?ng m?c ?ích c?a bài này là gi?i thi?u cho b?n bi?t nh?ng “kh? n?ng” c?a #define và template có th? làm ???c mà b?n ch?a bi?t.

Go to link Download

Delete with CheckBox Java swing gui Xóa dữ liệu bảng bằng ChẹckBox trong Java Swing

package com.java.myapp;

import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.table.DefaultTableModel;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class MyForm extends JFrame {

 static JTable table;

 /**
 * Launch the application.
 */
 public static void main(String[] args) {
 EventQueue.invokeLater(new Runnable() {
 public void run() {
 MyForm frame = new MyForm();
 frame.setVisible(true);
 }
 });
 }

 /**
 * Create the frame.
 */
 public MyForm() {
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 setBounds(100, 100, 516, 319);
 setTitle("ThaiCreate.Com Java GUI Tutorial");
 getContentPane().setLayout(null);

 // Customer List
 JLabel lblCustomerList = new JLabel("Customer List");
 lblCustomerList.setBounds(207, 44, 87, 14);
 getContentPane().add(lblCustomerList);

 // ScrollPane
 JScrollPane scrollPane = new JScrollPane();
 scrollPane.setBounds(28, 84, 440, 89);
 getContentPane().add(scrollPane);

 // Table
 table = new JTable();
 scrollPane.setViewportView(table);

 // Button Delete
 JButton btnDelete = new JButton("Delete");
 btnDelete.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {

 Object[] options = { "Yes", "No" };
 int n = JOptionPane
 .showOptionDialog(null, "Do you want to Delete data?",
 "Confirm to Delete?",
 JOptionPane.YES_NO_CANCEL_OPTION,
 JOptionPane.QUESTION_MESSAGE, null, options,
 options[1]);
 if (n == 0) // Confirm Delete = Yes
 {

 for (int i = 0; i < table.getRowCount(); i++) {
 Boolean chkDel = Boolean.valueOf(table.getValueAt(i, 0).toString()); // Checked
 if(chkDel) // Checked to Delete
 {
 String strCustomerID = table.getValueAt(i, 1)
 .toString(); // get CustomerID
 
 DeleteData(strCustomerID); // Delete Data
 }
 }
 
 JOptionPane.showMessageDialog(null, "Delete Data Successfully");

 PopulateData(); // Reload Table
 }

 }
 });
 btnDelete.setBounds(205, 202, 89, 23);
 getContentPane().add(btnDelete);

 PopulateData();
 }

 private void PopulateData() {

 // Clear table
 table.setModel(new DefaultTableModel());

 // Model for Table
 DefaultTableModel model = new DefaultTableModel() {

 public Class<?> getColumnClass(int column) {
 switch (column) {
 case 0:
 return Boolean.class;
 case 1:
 return String.class;
 case 2:
 return String.class;
 case 3:
 return String.class;
 case 4:
 return String.class;
 case 5:
 return String.class;
 case 6:
 return String.class;
 default:
 return String.class;
 }
 }
 };
 table.setModel(model);

 // Add Column
 model.addColumn("Select");
 model.addColumn("CustomerID");
 model.addColumn("Name");
 model.addColumn("Email");
 model.addColumn("CountryCode");
 model.addColumn("Budget");
 model.addColumn("Used");

 Connection connect = null;
 Statement s = null;

 try {
 Class.forName("com.mysql.jdbc.Driver");

 connect = DriverManager
 .getConnection("jdbc:mysql://localhost/mydatabase"
 + "?user=root&password=root");

 s = connect.createStatement();

 String sql = "SELECT * FROM customer ORDER BY CustomerID ASC";

 ResultSet rec = s.executeQuery(sql);
 int row = 0;
 while ((rec != null) && (rec.next())) {
 model.addRow(new Object[0]);
 model.setValueAt(false, row, 0); // Checkbox
 model.setValueAt(rec.getString("CustomerID"), row, 1);
 model.setValueAt(rec.getString("Name"), row, 2);
 model.setValueAt(rec.getString("Email"), row, 3);
 model.setValueAt(rec.getString("CountryCode"), row, 4);
 model.setValueAt(rec.getFloat("Budget"), row, 5);
 model.setValueAt(rec.getFloat("Used"), row, 6);
 row++;
 }

 } catch (Exception e) {
 
 e.printStackTrace();
 }

 }

 // Delete
 private void DeleteData(String strCustomerID) {

 Connection connect = null;
 Statement s = null;

 try {
 Class.forName("com.mysql.jdbc.Driver");

 connect = DriverManager
 .getConnection("jdbc:mysql://localhost/mydatabase"
 + "?user=root&password=root");

 s = connect.createStatement();

 String sql = "DELETE FROM customer WHERE " + "CustomerID = "
 + strCustomerID + " ";
 s.execute(sql);

 } catch (Exception e) {

 e.printStackTrace();
 }

 }

}

Go to link Download

Create an array of 10 000 random interger number elements array A Tạo Radom Array Integer trong C

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
 
int main()
{
 int i;
 int arraysize = 100; //cho chay 100 vong test!
 int numbers[arraysize]; //Khai bao mang kich thuoc 100
 srand(time(NULL));
 //Gan moi so Random vao mang thu i
 for(i=0; i<arraysize ; i++){
 numbers[i] = rand()%10000;
 }
 //In ra man hinh mang vua Random
 for (i=0;i< arraysize;i++)
 {
 printf("%d ",numbers[i]);
 }
 return 0;
}

Go to link Download