Clases Scanner Integer Y Ejemplos En JAVA

Permutacion con repeticion = nr

Permutacion sin repetición =

Combinacion sin repetir = Rad = (°’s x PI) / 180

Num Perfecto = 6 es un número perfecto porque sus divisores propios son 1, 2 y 3; y 6 = 1 + 2 + 3. (28, 496 y 8128 y 33 550 336)

public void P( int N ) {

int cuenta = 0;

for ( int j = 1; j <= N; j++ ){

cuenta = 0;

for ( int i = 1; i <= j/2 ; i++ )

if( 0 == j % i )

cuenta += i;

if ( cuenta == j ){

Imprime(j);

}

}

}

public void Imprime( int x ){

System.out.printf("%d = ", x);

for ( int s = 1; s <= x/2; s++ ){

if ( 0 == x%s )

System.out.printf("\t%3d", s);

}

System.out.println("\n");

}

public static void main(){

Scanner escaner = new Scanner(System.in);

System.out.println("");

int numero = escaner.nextInt();

if ( esP(numero) == true ){

System.out.println("ES P");

}

}

public static boolean esP(int numero){

int contador =2;

boolean p=true;

while( (p == true) && (contador!=numero)){

if ( numero % contador == 0){

p = false;

}

contador++;

}

return p;

}

public static void main(String[]args){

int angulo;

int aproximacion;

int cont=1;

boolean bandera=true;

double aux=0;

angulo=Integer.parseInt(JOptionPane.showInputDialog(null,"angle"));

aproximacion=Integer.parseInt(JOptionPane.showInputDialog(null,"iteratos"));

double radian= formula;

while(cont<=aproximacion){

if(bandera==true){

aux=aux+((Math.pow(radian,cont))/Seno.factorial(cont));

bandera=false;

}else{

aux=aux-((Math.pow(radian,cont))/Seno.factorial(cont));

bandera=true;

}

cont=cont+2;

}

JOptionPane.showMessageDialog(null,"el angulo es: "+ angulo + "\n" + "angulo en radianes: " +radian+ "\n" + "el seno del angulo es: " +( Math.round(aux*Math.pow(10,4))/Math.pow(10,4)));

}

public static int factorial(int cont){

int resultado=1;

for(int i=cont;i>0;i--){

resultado*=i;

}

return resultado;

}

public static void main(String[]args){

double focos;

focos=Integer.parseInt(JOptionPane.showInputDialog(null," numero de focos en el pasillo?"));//se guarda el num ero de focos que abra en el pasillo

double vueltasPasillo= Math.sqrt(focos);//sacamos la raiz cuadrada del numero de focos y guardamos en la variable vueltasPasillo

if((int)vueltasPasillo*(int)vueltasPasillo==focos){//casteamos con entero.. y multiplicamos la variable vueltasPasillo por si misma... si el resultado es igual al numero de focos entonces el foco esta encendido.. si no esta apgado

JOptionPane.showMessageDialog(null,"el ultimo foco esta prendido");

} else{

JOptionPane.showMessageDialog(null,"el ultimo foco esta apagado");

}

}

CLASE SCANER

Method Summary

void close()

Closes this scanner.

Pattern

delimiter()

Returns the Pattern this Scanner is currently using to match delimiters.

String

findInLine(Pattern pattern)

Attempts to find the next occurrence of the specified pattern ignoring delimiters.

String

findInLine(String pattern)

Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.

String

findWithinHorizon(Pattern pattern, int horizon)

Attempts to find the next occurrence of the specified pattern.

String

findWithinHorizon(String pattern, int horizon)

Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.

boolean hasNext()

Returns true if this scanner has another token in its input.

boolean hasNext(Pattern pattern)

Returns true if the next complete token matches the specified pattern.

boolean hasNext(String pattern)

Returns true if the next token matches the pattern constructed from the specified string.

boolean hasNextBigDecimal()

Returns true if the next token in this scanner's input can be interpreted as a BigDecimal using the nextBigDecimal() method.

boolean hasNextBigInteger()

Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the default radix using the nextBigInteger() method.

boolean hasNextBigInteger(int radix)

Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the specified radix using the nextBigInteger() method.

boolean hasNextBoolean()

Returns true if the next token in this scanner's input can be interpreted as a boolean value using a case insensitive pattern created from the string "true|false".

boolean hasNextByte()

Returns true if the next token in this scanner's input can be interpreted as a byte value in the default radix using the nextByte() method.

boolean hasNextByte(int radix)

Returns true if the next token in this scanner's input can be interpreted as a byte value in the specified radix using the nextByte() method.

boolean hasNextDouble()

Returns true if the next token in this scanner's input can be interpreted as a double value using the nextDouble() method.

boolean hasNextFloat()

Returns true if the next token in this scanner's input can be interpreted as a float value using the nextFloat() method.

boolean hasNextInt()

Returns true if the next token in this scanner's input can be interpreted as an int value in the default radix using the nextInt() method.

boolean hasNextInt(int radix)

Returns true if the next token in this scanner's input can be interpreted as an int value in the specified radix using the nextInt() method.

boolean hasNextLine()

Returns true if there is another line in the input of this scanner.

boolean hasNextLong()

Returns true if the next token in this scanner's input can be interpreted as a long value in the default radix using the nextLong() method.

boolean hasNextLong(int radix)

Returns true if the next token in this scanner's input can be interpreted as a long value in the specified radix using the nextLong() method.

boolean hasNextShort()

Returns true if the next token in this scanner's input can be interpreted as a short value in the default radix using the nextShort() method.

boolean hasNextShort(int radix)

Returns true if the next token in this scanner's input can be interpreted as a short value in the specified radix using the nextShort() method.

IOException

ioException()

Returns the IOException last thrown by this Scanner's underlying Readable.

Locale

locale()

Returns this scanner's locale.

MatchResult

match()

Returns the match result of the last scanning operation performed by this scanner.

String

next()

Finds and returns the next complete token from this scanner.

String

next(Pattern pattern)

Returns the next token if it matches the specified pattern.

String

next(String pattern)

Returns the next token if it matches the pattern constructed from the specified string.

BigDecimal

nextBigDecimal()

Scans the next token of the input as a BigDecimal.

BigInteger

nextBigInteger()

Scans the next token of the input as a BigInteger.

BigInteger

nextBigInteger(int radix)

Scans the next token of the input as a BigInteger.

boolean nextBoolean()

...