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Convert pseudocode to Java

Codoritmo translates your algorithm into a Java class with its main method: it works out the types (int, double, boolean, String), turns your functions into static methods and adds what's needed to read values from the keyboard.

Open this example and see its Java

Opens the program in Codoritmo; choose Java in View › Translate To.

The same algorithm in pseudocode and in Java

The “Grade Average” example, with an array and a Para loop, and the Java that Codoritmo generates for it, untouched.

Pseudocode

PromedioNotas.psc · 21 lines
Proceso PromedioNotas    Definir notas Como Real    Dimension notas[5]    Definir suma, promedio, maximo Como Real    Definir i Como Entero    suma <- 0.0    maximo <- 0.0    // Llenar el arreglo    Para i <- 1 Hasta 5 Hacer        Escribir "Ingrese nota ", i, ": "        Leer notas[i]        suma <- suma + notas[i]        // Encontrar la nota máxima        Si notas[i] > maximo Entonces            maximo <- notas[i]        FinSi    FinPara    promedio <- suma / 5    Escribir "Promedio: ", promedio    Escribir "Nota más alta: ", maximoFinProceso

Java generated by Codoritmo

PromedioNotas.java · 59 lines
// Este código fue generado por Codoritmo a partir del pseudocódigo.// Puede que no sea completamente correcto: revíselo antes de usarlo.import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.math.BigDecimal;import java.math.RoundingMode;class Promedionotas {    static BufferedReader entrada = new BufferedReader(new InputStreamReader(System.in));    public static void main(String[] args) {        int i = 0;        double maximo = 0.0;        double promedio = 0.0;        double suma = 0.0;        double[] notas = new double[5];        suma = 0;        maximo = 0;        for (i = 1; i <= 5; i++) {            System.out.println("Ingrese nota " + i + ": ");            notas[i - 1] = leerReal();            suma = suma + notas[i - 1];            if (notas[i - 1] > maximo) {                maximo = notas[i - 1];            }        }        promedio = suma / 5;        System.out.println("Promedio: " + texto(promedio));        System.out.println("Nota más alta: " + texto(maximo));    }    // Lee una línea de la entrada.    static String leer() {        try {            String linea = entrada.readLine();            return linea == null ? "" : linea;        } catch (IOException e) {            return "";        }    }    static double leerReal() {        return Double.parseDouble(leer().trim());    }    // Escribe un número como PSeInt: redondeado a 10 decimales, sin ceros    // finales y sin notación exponencial.    static String texto(double valor) {        if (Double.isNaN(valor) || Double.isInfinite(valor)) return String.valueOf(valor);        return new BigDecimal(valor).setScale(10, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString();    }    static String texto(boolean valor) {        return valor ? "VERDADERO" : "FALSO";    }}

This is exactly the code Codoritmo generates for this program, including the comment at the top, which is always in Spanish.

How to translate your pseudocode to Java

  1. Write or open your algorithm

    It must be free of syntax errors; the Problems panel lists any.

  2. Choose Java

    In View › Translate To, choose Java. The code tab in the side panel shows the translation.

  3. Compare and copy

    The translation updates as you type. Copy it, or download it as .java with File › Export As.

  4. Run it

    Save it under the class name, for example Promedionotas.java, and run java Promedionotas.java (Java 11 or later).

Open this example and see its Java

Opens the program in Codoritmo; choose Java in View › Translate To.

What changes in Java

The class is named after your algorithm: Algoritmo PromedioNotas becomes class Promedionotas.

To read input, the code adds small methods (leerEntero, leerReal…) that read a line from the keyboard and convert it to the variable's type.

Arrays are created with new and their size can be a variable, so Dimension datos[n] translates directly. As in C, indexes start at 0 and datos[i] becomes datos[i - 1] when your profile uses 1-based arrays.

Real numbers are printed as PSeInt does, rounded to 10 decimals, by a helper method called texto.

How each instruction is translated

Each row is one PSeInt instruction translated by Codoritmo inside a program with integers n and i, a real x, a text nombre and an array datos[5]. The output is generated when this page is built.

InstructionPSeIntJava
Write (Escribir)
Escribir "Hola, ", nombre
System.out.println("Hola, " + nombre);
Write without a newline
Escribir Sin Saltar "Total: "
System.out.print("Total: ");
Read an integer (Leer)
Leer n
n = leerEntero();
Read a real number
Leer x
x = leerReal();
Random number
n <- Aleatorio(1, 6)
n = 1 + (int) (Math.random() * (6 - 1 + 1));
If … else (Si … SiNo)
Si n MOD 2 = 0 Entonces
    Escribir "par"
SiNo
    Escribir "impar"
FinSi
if (n % 2 == 0) {
    System.out.println("par");
} else {
    System.out.println("impar");
}
Switch (Segun)
Segun n Hacer
    1: Escribir "uno"
    De Otro Modo: Escribir "otro"
FinSegun
switch (n) {
    case 1:
        System.out.println("uno");
        break;
    default:
        System.out.println("otro");
}
While (Mientras)
Mientras n > 0 Hacer
    n <- n - 1
FinMientras
while (n > 0) {
    n = n - 1;
}
Repeat … until (Repetir)
Repetir
    Leer n
Hasta Que n > 0
do {
    n = leerEntero();
} while (n <= 0);
For (Para)
Para i <- 1 Hasta 10 Hacer
    Escribir i
FinPara
for (i = 1; i <= 10; i++) {
    System.out.println(i);
}
Array element
datos[1] <- n
datos[0] = n;

Codoritmo and PSeInt desktop

PSeInt desktop also exports to Java. These are the differences.

What Codoritmo adds

  • You see the translation next to the pseudocode, and it updates as you type.
  • It also exports to C#, PHP, Pascal, Visual Basic, QBasic, MatLab and HTML, like PSeInt.
  • The translation follows the chosen profile, such as 0-based or 1-based arrays.

What PSeInt desktop does that Codoritmo doesn't yet

  • Its exporter has many years of classroom use; Codoritmo's is newer, so review the code before you hand it in.

Codoritmo is an independent project, inspired by PSeInt and compatible with its syntax and school profiles. It is not PSeInt and is not affiliated with it. Official PSeInt website

Frequently asked questions

Which Java version do I need?

The code compiles with Java 8 or later. To run it directly with java File.java, without compiling first, you need Java 11 or later.

Why doesn't it use Scanner?

It uses BufferedReader, which reads a whole line at a time, like Leer in PSeInt. That way each answer you type matches one Leer.

Does the code follow Java style?

It's written to resemble your pseudocode, not to follow every Java convention: for example, it declares every variable at the start of main. It's a good starting point to rewrite your own way.

Examples to try

Solved programs, each with its code, its flowchart and a sample run.

  • Grade Average

    Stores five grades in an array and finds the average and the highest.

    Beginner

  • Linear Search

    Finds a name in a list, ignoring upper and lower case.

    Intermediate

  • Factorial and Power

    Functions that compute a factorial and a power.

    Intermediate

  • Selection Sort

    Finds the smallest of the remaining numbers and puts it in its place.

    Intermediate

By concept:Arrays examples

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