#include <iostream> //untuk memangguil libary
using namespace std; //untuk mendeklarasi global std

int main() //fungsi tubuh utama dari program
{ //membuka program
  
  cout << "Program menghitung diskon produk" << endl; //judul program
  cout << "================================" << endl; //batas judul program
  
    float x; //memasukkan x sebagai variabel untuk inputan angka dibawah, pakai float agar dapat menampung inputan besar
    cout << "Total Belanja : " << endl; //meminta pengguna memasukkan total belanja
    cin >> x; //menyimpan inputan sebagai variabel
    
    cout << endl; //untuk mengeluarkan spasi agar program lebih enak dilihat
    
    if (x >= 100000 & x<500000) //fungsi if pertama, Jika total belanja antara Rp. 100.000 – Rp. 500.000
    { //awalan tubuh if
      cout << "selamat, anda mendapat diskon 10%" << endl; //cout apabila fungsi if pertama terpenuhi
      cout << "Total Bayar = " <<x-(x/10)<<endl; //cout tambahan menghitung total belanja setelah diskon
    } //akhiran tubuh if
    else if (x >=500000 & x <= 1000000) //fungsi else if ketika total belanja lebih besar sama dengan 5000000 dan lebih kecil dari 1000000
    { //awalan tubuh else if
      cout << "selamat, anda mendapat diskon 20%" << endl; //cout apabila fungsi else if diatas terpenuhi
      cout << "Total Bayar = " <<x-(x/20)<<endl; //cout tambahan menghitung total belanja setelah diskon
    } //akhiran tubuh else if
    else if (x > 1000000) //fungsi else if ketika total belanja lebih dari 1000000
    { //awalan tubuh else if
      cout << "selamat, anda mendapat diskon 30%" << endl;//cout apabila fungsi else if diatas terpenuhi
      cout << "Total Bayar = " <<x-(x/30)<<endl; //cout tambahan menghitung total belanja setelah diskon
    } //akhiran tubuh else if
    else  //fungsi else ketika semua syarat tidak terpenuhi (dalam program ini, ketika total belanja kurang dari 1000000)
    { //awalan tubuh if
      cout << "Total Bayar = " <<x<< endl; //cout ketika total belanja kurang dari 100000 (tidak dapat diskon)
    } //akhiran tubuh if
    

    return 0; //mengakhiri program
} //akhir tubuh program

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}