> For the complete documentation index, see [llms.txt](https://educacion.gitbook.io/programacion/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://educacion.gitbook.io/programacion/exercicios-java/ud1-solucions/solucions-cadenas-math-e-algoritmia.md).

# Solucions cadenas, Math e algoritmia

1. Lonxitude cadea

```java
import java.util.Scanner;

public class ConvertirMayusculas {
    public static void main(String[] args) {
        Scanner scanner;
        String cadena, cadenaMayusculas;
        scanner = new Scanner(System.in);
        
        System.out.print("Introduce una cadena de texto: ");
        cadena = scanner.nextLine();
        
        cadenaMayusculas = cadena.toUpperCase();
        
        System.out.println("Cadena en mayúsculas: " + cadenaMayusculas);
        
        scanner.close();
    }
}
```

2. Concatenar

```java
import java.util.Scanner;

public class ConcatenarCadenas {
    public static void main(String[] args) {
        Scanner scanner;
        String cad1, cad2, resultado;
        
        scanner = new Scanner(System.in);
        
        // Recibir primera cadena
        System.out.print("Introduce la primera cadena (cad1): ");
        cad1 = scanner.nextLine();
        
        // Recibir segunda cadena
        System.out.print("Introduce la segunda cadena (cad2): ");
        cad2 = scanner.nextLine();
        
        // Concatenar las cadenas
        resultado = cad1 + cad2;
        
        // Mostrar el resultado
        System.out.println("Resultado de la concatenación: " + resultado);
        
        scanner.close();
    }
}
```

3. Par e divisible entre 7

```java
import java.util.Scanner;

public class AnalizarCadena {
    public static void main(String[] args) {
        Scanner scanner;
        String cadena;
        int longitud;
        boolean cumpleCondiciones;
        
        scanner = new Scanner(System.in);
        
        // Recibir cadena por pantalla
        System.out.print("Introduce una cadena: ");
        cadena = scanner.nextLine();
        
        // Obtener la longitud de la cadena
        longitud = cadena.length();
        
        // Verificar condiciones
         cumpleCondiciones = (longitud % 7 == 0) && (longitud % 2 == 0);
        
        // Mostrar resultados
        System.out.println("La cadena es par y divisible entre 7: "
         + (cumpleCondiciones ? "SÍ" : "NO"));
        
        scanner.close();
    }
}
```

4. Palindroma

```java
import java.util.Scanner;

public class Palindromo4Letras {
    public static void main(String[] args) {
        Scanner scanner;
        String palabra, palabraMinusculas;
        
        scanner = new Scanner(System.in);
        
        // Recibir palabra por pantalla
        System.out.print("Introduce una palabra de 4 letras: ");
        palabra = scanner.nextLine();
        palabraMinusculas = palabra.toLowerCase();
            
        // Verificar si es palíndroma
        boolean esPalindromo = 
                palabraMinusculas.charAt(0) == palabraMinusculas.charAt(3) && 
                palabraMinusculas.charAt(1) == palabraMinusculas.charAt(2);
        
        System.out.println("La cadena es palindroma: "
         + (esPalindromo ? "SÍ" : "NO"));
        
        scanner.close();
   }
} 
            
```


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