sistema de convercion de números decimales a binarios

Decimal a Binario

import java.util.Scanner;

public class decimal_binario1 {

     public static void main(String[] args) {

          // TODO Auto-generated method stub

         

          int numero, exp, digito;

        double binario;

        Scanner sc=new Scanner(System.in);

        do{ 

            System.out.println("Introduce un numero entero ");

            numero = sc.nextInt();

        }while(numero<0);

        exp=0;

        binario=0;

        while(numero!=0){

         

                digito = numero % 2;

                binario = binario + digito * Math.pow(10, exp);

                exp++;

                numero = numero/2;

              

        }

        System.out.println("");

        System.out.printf("Binario:");

        System.out.printf(" %.0f %n", binario);

     }

}

sistema de convercion de binario a decimal

Binario a Decimal

import java.util.Scanner;

public class prueba_bianrio {

     public static void main(String[] args) {

          // TODO Auto-generated method stub

         

         System.out.print("Introduce un numero binario: ");

         Scanner bi=new Scanner(System.in);

         int binario=bi.nextInt();

        

          int decimal=0;

          int base=0;

         

          do{

          if(binario%10==1){

          decimal+=(int)Math.pow(2,base);

          }

          binario=binario/10;

          base+=1;

          }while(binario!=1);

         

          decimal+=(int)Math.pow(2,base);

          System.out.printf("decimal: ");

          System.out.println(decimal);

     }

}

area y perimetro de un triangulo, cuadrado, circulo

Menu para calcular el area y el perimetro de un:
  Ø Cuadrado 
  Ø Triangulo

    Ø Circulo 

package proyecto_6;

import java.util.Scanner;

import java.math.*;

public class area_perimetro {

       private static int fig;

       private static Scanner literal;

       public static void main(String[] args) {

            

             System.out.println(".......cualcule el area y el perimetro de una figura......");

             System.out.println("...menu...");

             System.out.println("1. perimetro");

             System.out.println("2. area");

             System.out.println("3. salir");

             System.out.println("ingrese el literal a efectuar");

             literal = new Scanner(System.in);

             int lit=literal.nextInt();

            

             switch (lit){

            

             case 1:

                   

                    System.out.println("...figuras geometricas...");

                    System.out.println("1. triangulo");

                    System.out.println("2. cuadrado");

                    System.out.println("3. circulo");

                    System.out.println("4. regresar");

                    System.out.println("ingrese el literal de la figura que desea");

                    Scanner figura=new Scanner(System.in);

                    fig=figura.nextInt();

                   

                    switch (fig){

                   

                    case 1:

                          

                           System.out.println("usted calculara el perimetro de un triangulo");

                           System.out.println("ingrese lado #1");

                           Scanner lado_1=new Scanner(System.in);

                           double ld_1=lado_1.nextDouble();

                          

                           System.out.println("ingrese lado #2");

                           Scanner lado_2=new Scanner(System.in);

                           double ld_2=lado_2.nextDouble();

                          

                           System.out.println("ingrese lado #3");

                           Scanner lado_3=new Scanner(System.in);

                           double ld_3=lado_3.nextDouble();

                          

                           double pt=ld_1+ld_2+ld_3;

                           System.out.println("el perimetro del triangulo es: "+ pt);

                           break;

                                 

                           case 2:

                                 

                                  System.out.println("usted calculara el perimetro de un cuadrado");

                                  System.out.println("ingrese un lado del cuadrado");

                                  Scanner lad_1=new Scanner(System.in);

                                  double ld1=lad_1.nextDouble();

                                 

                                  double pc=Math.pow(ld1,4);

                                  System.out.println("el perimetro del cuadrado es: "+ pc);

                                  break;

                                 

                                  case 3:

                                       

                                        System.out.println("usted calculara el perimetro de un circulo");

                                        System.out.println("ingrese el radio del circulo");

                                        Scanner radio=new Scanner(System.in);

                                        double rd=radio.nextDouble();

                                       

                                        double pcl=2*rd;

                                        System.out.println("el perimetro del circulo es: "+ pcl);

                                        break;

                                        }

                    break;

                   

                    case 2:

                          

                           System.out.println("...figuras geometricas...");

                           System.out.println("1. triangulo");

                           System.out.println("2. cuadrado");

                           System.out.println("3. circulo");

                           System.out.println("4. regresar");

                           System.out.println("ingrese el literal de la figura que desea");

                           Scanner figur=new Scanner(System.in);

                           fig=figur.nextInt();

                          

                           switch (fig){

                          

                           case 1:

                                 

                                  System.out.println("usted calculara el area de un triangulo");

                                  System.out.println("ingrese lado #1");

                                  Scanner lado_1=new Scanner(System.in);

                                  double ld_1=lado_1.nextDouble();

                                 

                                  System.out.println("ingrese la altura del triangulo");

                                  Scanner altura=new Scanner(System.in);

                                  double al=altura.nextDouble();

                                 

                                  System.out.println("ingrese la base del triangulo");

                                  Scanner base=new Scanner(System.in);

                                  double bs=base.nextDouble();

                                 

                                  double at=(bs*al)/2;

                                  System.out.println("el area del triangulo es: "+ at);

                                  break;

                                 

                                  case 2:

                                       

                                        System.out.println("usted calculara el area de un cuadrado");

                                        System.out.println("ingrese un lado del cuadrado");

                                        Scanner lad_1=new Scanner(System.in);

                                        double ld1=lad_1.nextDouble();

                                       

                                        double ac=Math.pow(ld1,2);

                                        System.out.println("el area del cuadrado es: "+ ac);

                                        break;

                                       

                                        case 3:

                                              

                                               System.out.println("usted calculara el area de un circulo");

                                               System.out.println("ingrese el radio del circulo");

                                               Scanner radio=new Scanner(System.in);

                                               double rd=radio.nextDouble();

                                              

                                               double acl=3.1416*(Math.pow(rd,2));

                                               System.out.println("el area del circulo es: "+ acl);

                                               break;

                                               }

                           case 3:

                                  System.out.println("gracias por usar nuestro programa");

                                  System.out.println("......adios.....");

                           break;

                          

                           }

       }

}