#include <iostream>
using namespace std;

int main() 
{
    //title
    cout<<"\t-------VENDING MACHINE-------\n";
    //declare the variables soda, chips, candy
    int soda = 1;
    int chips = 2;
    int candy = 3;
    //asking the user for input
    //but fast we are going to tell the user all the available options
    
    cout<<"\nTHIS IS THE AVAILABLE STOCK";
    cout<<"\n 1. SODA\n";
    cout<<"\n 2. CHIPS\n";
    cout<<"\n 3. CANDY\n";
    
    //now we want our customer to make an order
    cout<<"\n WHAT WOULD YOU LIKE TO ORDER:_ _ _ \n";
    cout<<"\n\t-----ONLY NUMBERS ARE ALLOWED-----\n";
    int  order;
    //asking for input from the customer
    cin>> order;
    //now we give the customer what they have  ordered
    //we are going to use control statements
    if(order <= 3){
      cout<<"\n\tLOADING ORDER.....\n";
      // now we put nested statements to uniquely identify the order
      if(order == 1){
        cout<<"\n\tORDER READY HERE IS YOUR--SODA--\n";
        cout<<"\n\t-----THANK YOU-----\n";
      }
      else if(order == 2){
        cout<<"\n\tORDER READY HERE ARE YOUR --CHIPS--\n";
        cout<<"\n\t-----THANK YOU-----\n";
      }
      else if(order == 3){
        cout<<"\n\t ORDER READY HERE IS YOUR --CANDY--\n";
        cout<<"\n\t-----THANK YOU-----\n";
      }
    }
    
    else{
      cout<<"\n\t---ORDER NOT AVAILABLE---";
      cout<<"\n\t PLEASE RESET AND MAKE A NEW ORDER:_ _ _\n";
      
    }
    
    
    
    return 0;
}
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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
}