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Introducción a JAVA

Introducción a JAVA. COMP 250. Estructura de Selección. selection statements Escoger cuál acción ejecutar dependiendo de dos ó más alternativas a evaluar

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Introducción a JAVA

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  1. Introducción a JAVA COMP 250

  2. Estructura de Selección • selection statements • Escogercuálacciónejecutardependiendo de dos ó másalternativas a evaluar • Las condiciones son expresionesbooleanas, estoes, el resultado de unacomparaciónes un valor booelano (true / false)

  3. Estructura de Selección • Operadores de comparación Observar que el radio de un círculo no puede ser cero ó negativo (menor que cero)

  4. Estructura de Selección • Ejemplo double radius = 1; System.out.println(radius > 0); • El valor a mostrar en el output debesertrue

  5. Estructura de Selección • if statements • One-way if statements • Formato: if (boolean-expression) { statement(s);} false (radius >= 0) true area = radius * radius * PI;System.out.println(“The area for the circle of radius “ + radius + “ is “ + area);

  6. Estructura de Selección • Two-way if statement • Formato: if(boolean-expression) { statement(s)-for-the-true-case; } else { statement(s)-for-the-false-case; } true false Boolean expression Statements for the true case Statements for the false case

  7. Estructura de Selección • Nested if statements if (score >= 90.0) grade = ‘A’; else if (score >= 80.0) grade = ‘B’; else if (score >=70.0) grade = ‘C’; else if (score >= 60.0) grade = ‘D’; else grade = ‘F’;

  8. Estructura de Selección • switch statement T Compute tax for single filers status = 0 break F T Status = 1 Compute tax for married filers break default Default actions

  9. Estructura de Selección • Ejemplo: switch (status) { case 0: compute taxes for single filers; break; case 1: compute taxes for married filers; break; default: System.out.println(“Errors: invalid status”); System.exit(0);

  10. Formatting console output • Formato general: System.out.printf(format, item1, item2, …itemz) Donde format es un string que puede consistir de varios formatos especializados

  11. Formatting console output Ejemplo: int count =5; double amount = 45.56; System.out.printf(“count is %d and amount is %f”, count, amount); Output: count is 5 and amount is 45.560000

  12. Formatting console output

  13. Logical Operators Ejemplos: (asumir que age = 24, gender = ‘F’) !(age > 18) …………………………………………………..false !(gender == ‘M’)…………………………………………..true

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