Tugas 4 : Kalkulator Sederhana

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Nama/NIM : Ni Komang Widyasanti/1404505061

Jurusan/Fakultas/Universitas : Teknologi Informasi/Teknik/Universitas Udayana
Mata Kuliah : Pemrograman Berorientasi Objek (B)

Dosen : I Putu Agus Eka Pratama, ST MT

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Kalkulator Sederhana dengan Java

Pada pembahasan kali ini saya akan membahas cara membuat kalkulator sederhana menggunakan Java. Seperti biasa, langkah pertama adalah membuat project baru.

langkah berikutnya adalah membuat method rumus untuk masing-masing operasi

public int tambah (int a, int b) { int c = a + b ; return c; } public int kurang (int a, int b) { int c = a - b; return c; } public int kali (int a, int b) { int c = a * b; return c; } public float bagi (int a, int b) { int c = a / b; return c; }

Kemudian membuat method input sekaligus mengecek inputan

public int inputangka () { String angka; int d = 0; try { BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in)); angka = buffer.readLine(); d = Integer.parseInt(angka); } catch (IOException e) { System.err.println("Input error! : " + e); } return d; }

Langkah berikutnya adalah membuat method menu, yang akan diinputkan berdasarkan keinginan user public void inputmenu (int pilih) { int a, b; float c; switch (pilih) { case 1 : System.out.println("+++++++++++++++++++"); System.out.println("Operasi Penjumlahan"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.tambah(a,b); System.out.println("Hasil = " + c); System.out.println("+++++++++++++++++++"); break; case 2 : System.out.println("-------------------"); System.out.println("Operasi Pengurangan"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.kurang(a,b); System.out.println("Hasil = " + c); System.out.println("-------------------"); break; case 3 : System.out.println("xxxxxxxxxxxxxxxxxxx"); System.out.println("Operasi Perkalian"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.kali(a,b); System.out.println("Hasil = " + c); System.out.println("xxxxxxxxxxxxxxxxxxx"); break; case 4 : System.out.println("///////////////////"); System.out.println("Operasi Pembagian"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.bagi(a,b); System.out.println("Hasil = " + c); System.out.println("///////////////////"); break; case 5 : System.out.println ("Terima kasih telah menggunakan program kalkulator sederhana ini."); break; default : System.out.println("Maaf pilihan anda salah. Mohon ulangi lagi."); } }

langkah selanjutnya adalah mengisi main program

public static void main(String[] args) { int pilih; kalkulator Kalkulator = new kalkulator(); do { System.out.println("Pilih salah satu menu berikut: "); System.out.println("1. Penjumlahan"); System.out.println("2. Pengurangan"); System.out.println("3. Perkalian"); System.out.println("4. Pembagian"); System.out.println("5. Keluar"); System.out.println("==============================="); System.out.println("Pilihan: "); pilih = Kalkulator.inputangka(); Kalkulator.inputmenu(pilih); } while (pilih !=5); }

Jika sudah, silahkan lakukan compile terlebih dahulu untuk mengecek apakah program dapat berjalan dengan baik, kemudian lakukan run dan cobalah program yang kalian buat! :D

berikut adalah coding program secara keseluruhan

import java.io.*; public class kalkulator { public int tambah (int a, int b) { int c = a + b ; return c; } public int kurang (int a, int b) { int c = a - b; return c; } public int kali (int a, int b) { int c = a * b; return c; } public float bagi (int a, int b) { int c = a / b; return c; } public int inputangka () { String angka; int d = 0; try { BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in)); angka = buffer.readLine(); d = Integer.parseInt(angka); } catch (IOException e) { System.err.println("Input error! : " + e); } return d; } public void inputmenu (int pilih) { int a, b; float c; switch (pilih) { case 1 : System.out.println("+++++++++++++++++++"); System.out.println("Operasi Penjumlahan"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.tambah(a,b); System.out.println("Hasil = " + c); System.out.println("+++++++++++++++++++"); break; case 2 : System.out.println("-------------------"); System.out.println("Operasi Pengurangan"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.kurang(a,b); System.out.println("Hasil = " + c); System.out.println("-------------------"); break; case 3 : System.out.println("xxxxxxxxxxxxxxxxxxx"); System.out.println("Operasi Perkalian"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.kali(a,b); System.out.println("Hasil = " + c); System.out.println("xxxxxxxxxxxxxxxxxxx"); break; case 4 : System.out.println("///////////////////"); System.out.println("Operasi Pembagian"); System.out.println("Bilangan pertama = "); a = this.inputangka(); System.out.println("Bilangan kedua = "); b = this.inputangka(); c = this.bagi(a,b); System.out.println("Hasil = " + c); System.out.println("///////////////////"); break; case 5 : System.out.println ("Terima kasih telah menggunakan program kalkulator sederhana ini."); break; default : System.out.println("Maaf pilihan anda salah. Mohon ulangi lagi."); } } public static void main(String[] args) { int pilih; kalkulator Kalkulator = new kalkulator(); do { System.out.println("Pilih salah satu menu berikut: "); System.out.println("1. Penjumlahan"); System.out.println("2. Pengurangan"); System.out.println("3. Perkalian"); System.out.println("4. Pembagian"); System.out.println("5. Keluar"); System.out.println("==============================="); System.out.println("Pilihan: "); pilih = Kalkulator.inputangka(); Kalkulator.inputmenu(pilih); } while (pilih !=5); } }

Do Practice, Keep Learning, and Be Creative!

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