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package liiz;

public class IFEIseDemo {

public static void main (String [] args) {

int testscore = 76;
char grade;

if (testscore >=90) {
grade='A';

} else if(testscore >=80){
grade= 'B';

}else if (testscore >=70){
grade= 'C';

}else if (testscore >=60){
grade= 'D';

} else {
grade= 'F';

}System.out.println("grade = " + grade);
}

}

package liiz;

import java.util.Scanner;

public class AreaCirculo {

public static void main(String[] args){

//crea un objetotipo scanner
Scanner input = new Scanner (System.in);
System.out.println("teclea un numero para radio: ");
double radio = input.nextDouble();

// calculo de areadouble area = radio * radio * 3.14159;

//mostremos el resultado
System.out.println(" el area del circulo con radio " + radio + " es " + area);

}

}

packageliiz;

import java.util.Scanner;

public class CalculoPromedio {

public static void main(String[] args) {
// crea un objeto scanner
Scanner input = new Scanner (System.in);System.out.print(" proporciona tres numeros: ");
double num1 = input.nextDouble();
double num2 = input.nextDouble();
double num3 = input.nextDouble();//calculo promedio
double promedio = (num1 + num2 + num3) / 3;

//Display result
System.out.println("el promedio de " + num1 + " " + num2 + " "+ num3+ "es" + promedio);}

}

package lizbeth;

public class Cuadrado {

//atributo
int lado;
//constructor
public Cuadrado (int l){
lado = l;
}
//metodos
public intperimetro (){
return 4*lado;
}
public int area (){
return lado*lado;
}
@ Override
public String toString()
{
return "El lado del cuadro es = " +...