Tutoriales sobre Programacion: source code

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domingo, 2 de febrero de 2014

Cuenta regresiva de minutos y segundos con c++ – Auto – Register – Record

La función de éste programa de consola es permitirnos realizar una cuenta regresiva desde la cantidad de minutos que queramos.

Solo ingresamos la cantidad de minutos que queremos y la cuenta regresiva iniciará, además con cada segundo transcurrido el programa realizará un sonido de alerta (beep).

Codigo fuente:

#include iostream
#include windows.h

using namespace std;

int main(){
 int minutos, ii;
 cout  "Minutos?"  endl;
 cin  minutos;

 for(int j=minutos-1 ; j= 0; j--){
   ii = 59;
 for(int i = ii;  i = 0; i--){
  system("cls");
  cout  j  ":"  i  endl;
  cout  "\a";
  Sleep(1000);
 }
 }
}

Declaramos una variable llamada minutos la cual almacenará la cantidad de minutos que tendrá nuestra cuenta regresiva.

El ciclo for externo se iniciará enminutos - 1 es decir, si ingresamos 1 minuto el for iniciará en 0 y para que éste se ejecute colocaremos j= 0. El ciclo for interno empezará en 59, la cantidad de segundos que tiene un minuto (60) menos 1.

System("cls"); se encargará de limpiar la pantalla con cada segundo transcurrido, y la secuencia de escape \a emitirá un sonido de alerta con cada segundo transcurrido.

Es muy importante la funciónSleep(milisegundos) debido a que ésta determinará el intervalo de tiempo de cada ejecución del for interno, en éste casomil milisegundos = 1 segundo.

La ejecución sería de la siguiente manera:

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sábado, 18 de enero de 2014

Aplicación Android Tabla de multiplicar [Código Fuente/Source Code] – Miami – Curso – Credit

En una entrada escribí sobre laAplicación Android Tabla de multiplicar + apk, en ésta ocasión colocaré el código fuente de ésta aplicación, pueden revisarlo para ver como funciona, también modificarlo.

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {
 private EditText et1;
 private EditText et2;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  et1=(EditText)findViewById(R.id.et1);
  et2=(EditText)findViewById(R.id.et2);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
 
 public void ImpTabla(View v){
  String numero1 = et1.getText().toString();
  int numero2 = Integer.parseInt(numero1);
  String result2 = "";
  for(int i = 1; i = 12; i++){
   int result1 = i * numero2;
   result2 += i+ " x " + numero1 + " = " + String.valueOf(result1) + '\n';
  }
  et2.setText(result2);
 }

}

Inicialmenteasociamos nuestras variables et1 y et2 del tipo EditText a los controles EditText creados en el xml.


et1=(EditText)findViewById(R.id.et1);


et2=(EditText)findViewById(R.id.et2);

Luego el métodoImpTabla se encargará de realizar las operaciones necesarias e imprimir la salida en elcontrol EditText.

Se debe recordar que cuando tomamos un dato que hemos escrito en un control EditText éste dato es del tipo String, por ello debemos almacenarlo en una variable de éste mismo tipo de dato y luego convertirla en un entero.


String numero1= et1.getText().toString();


int numero2= Integer.parseInt(numero1);

Las 2 lineas anteriores muestran lo antes mencionado. Se almacena el dato en la variable numero 1 que es de tipo string y luego es transformada en tipo entero y almacenada en la variable numero2.

El ciclo for empezará desde 1 debido a que la tabla de multiplicar irá desde 1 hasta 12.

int result1 = i * numero2;

La variable result1 almacena las operaciones para luego imprimir el resultado es decir: 1 * 5 = 5, 2 * 5 = 10 ... 12 * 5 = 60.

Y finalmente

result2 += i+ " x " + numero1 + " = " + String.valueOf(result1) + '\n';

Almacena todos los resultados en la variable result 2concatenandolos con el operador+= y'\n'se encargará de separar las operaciones y los resultados con un salto de linea.

activity_main.xml

RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 

    TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="¿Que tabla de multiplicar deseas saber?" /

    EditText
        android:id="@+id/et1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tv1"
        android:layout_marginTop="22dp"
        android:ems="10" 

        requestFocus /
    /EditText

    Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/et1"
        android:onClick="ImpTabla"
        android:text="Aceptar" /

    EditText
        android:id="@+id/et2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        android:layout_marginTop="21dp"
        android:ems="10"
        android:inputType="textMultiLine" /

/RelativeLayout

En el control Button esimportante definir lapropiedadonclick del botón, ésta se encargará de activar el métodoImpTablacuando pulsemos el botón mientras nuestra aplicación se esté ejecutando.

android:onClick="ImpTabla"

Entre comillas debe ir el nombre del método que deseamos activar al pulsar el botón.

viernes, 3 de enero de 2014

[Ejercicio resuelto Java] Sumar dos matrices de orden 2x2 – Texas – Platform

Anteriormente escribí una entrada en el blog en la cual hablo un poco de algunas formas de manejar lasmatrices en java. En esta entrada veremos como sumar los elementos de dos matrices de orden 2x2 (2 filas, 2 columnas).

Enunciado:

"Realizar un programa en java el cual sume dos matrices de orden 2x2".

SumMatrices.java

import java.util.Scanner;

public class SumMatrices {
	private Scanner tec;
	private int[][] matrizA;
	private int[][] matrizB;
	private int[][] matrizC;
	
	
	public void CargarElementos(){
		tec = new Scanner(System.in);
		matrizA = new int[2][2];
		matrizB = new int[2][2];
		System.out.println("Ingrese los elementos de la matriz A: \n");
		System.out.println("Ingrese el elemento a11 de la matriz");
		matrizA[0][0] = tec.nextInt();
		System.out.println("Ingrese el elemento a12 de la matriz");
		matrizA[0][1] = tec.nextInt();
		System.out.println("Ingrese el elemento a21 de la matriz");
		matrizA[1][0] = tec.nextInt();
		System.out.println("Ingrese el elemento a22 de la matriz");
		matrizA[1][1] = tec.nextInt();
		//Matriz A:
		System.out.println("A=   " + matrizA[0][0] + "    " + matrizA[0][1]);
		System.out.println("     " + matrizA[1][0] + "    " + matrizA[1][1]);
		//----------------------------------------------------------------
		System.out.println("\nIngrese los elementos de la matriz B: \n");
		System.out.println("Ingrese el elemento b11 de la matriz");
		matrizB[0][0] = tec.nextInt();
		System.out.println("Ingrese el elemento b12 de la matriz");
		matrizB[0][1] = tec.nextInt();
		System.out.println("Ingrese el elemento b21 de la matriz");
		matrizB[1][0] = tec.nextInt();
		System.out.println("Ingrese el elemento b22 de la matriz");
		matrizB[1][1] = tec.nextInt();
		//Matriz B:
		System.out.println("B=   " + matrizB[0][0] + "    " + matrizB[0][1]);
		System.out.println("     " + matrizB[1][0] + "    " + matrizB[1][1]);
		//-----------------------------------------------------------------
	}
	
	public void Suma(){
		matrizC = new int[2][2];
		matrizC[0][0] = matrizA[0][0] + matrizB[0][0];
		matrizC[0][1] = matrizA[0][1] + matrizB[0][1];
		matrizC[1][0] = matrizA[1][0] + matrizB[1][0];
		matrizC[1][1] = matrizA[1][1] + matrizB[1][1];
	}
	
	public void Imprimir(){
		System.out.println("La Suma de ambas matrices es:  \n");
		//Matriz C:
		System.out.println("C=   " + matrizC[0][0] + "    " + matrizC[0][1]);
		System.out.println("     " + matrizC[1][0] + "    " + matrizC[1][1]);
		//-----------------------------------------------------------------
		System.out.println("\n Elementos de la matriz C: \n");
		System.out.println("Elemento c11: " + matrizC[0][0]);
		System.out.println("Elemento c12: " + matrizC[0][1]);
		System.out.println("Elemento c21: " + matrizC[1][0]);
		System.out.println("Elemento c22: " + matrizC[1][1]);
	}
	
	public static void main(String[] ar){
		SumMatrices sm = new SumMatrices();
		sm.CargarElementos();
		sm.Suma();
		sm.Imprimir();
	}
}

Explicación:

Declaramos tres matrices del tipo entero:

private int[][] matrizA;
private int[][] matrizB;
private int[][] matrizC;

Sí lo desean los elementos pueden ser también número reales, es decir, del tipo float.

Definimos el tamaño de nuestras matrices:

matrizA = new int[2][2];
matrizB = new int[2][2];

Luego, empezamos a cargar los elementos de ambas matrices, al finalizar la carga de los elementos de cada matriz, estos serán mostrados en pantalla para su comprobación.

El método Suma() será el encargado de sumar los elementos de ambas matrices y el resultado almacenarlo en una nueva matriz llamadamatrizC.

public void Suma(){
		matrizC = new int[2][2];
		matrizC[0][0] = matrizA[0][0] + matrizB[0][0];
		matrizC[0][1] = matrizA[0][1] + matrizB[0][1];
		matrizC[1][0] = matrizA[1][0] + matrizB[1][0];
		matrizC[1][1] = matrizA[1][1] + matrizB[1][1];
}

Finalmente imprimimos los resultados en pantalla con el métodoImprimir().

Salida:

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