//Point-of-Sale System

#include<studio.h>

void main(void) {
    int code, qty;
    float price;

    printf("==========");
    printf("PUREGOLD MENU\n");
    printf("==========\n\n");
    printf("Dairy\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("D1\t\tMilk\t\t100.00\n");
    printf("D2\t\tCheese\t\t200.00\n");
    printf("D3\t\tYogurt\t\t45.00\n\n");

    printf("MEAT\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("M1\t\tChicken\t\t160.00\n");
    printf("M2\t\tBeef\t\t300.00\n");
    printf("M3\t\tPork\t\t200.00\n\n");
    
    printf("SNACKS\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("S1\t\tChips\t\t30.50\n");
    printf("S2\t\tCookies\t\t120.00\n");
    printf("S3\t\tPopcorn\t\t65.00\n\n");

    printf("BEVERAGES\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("B1\t\tSoda\t\t15.50\n");
    printf("B2\t\tCoffee\t\t75.00\n");
    printf("B3\t\tTea\t\t40.75\n\n");

    printf("PRODUCE\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("P1\t\tApples\t\t20.00\n");
    printf("P2\t\tBananas\t\t50.75\n");
    printf("P3\t\tLettuce\t\t75.50\n\n");

    printf("FROZEN FOODS\n\n");
    printf("CODE\t\tMENU\t\tPRICE\n");
    printf("F1\t\tHotdogs\t\t350.00\n");
    printf("F2\t\tNuggets\t\t750.75\n");
    printf("F3\t\tVeggies\t\t250.50\n\n");

    printf("nEnter Code\t: ";
    scanf("%d", &code);
    printf("\nEnter Quantity: ");
    scanf("%d", &qty);

    switch (code) {
        case D1: price = 100.00;
                 break;
        case D2: price = 200.00;
                 break;
        case D3: price = 45.00;
                 break;
        case M1: price = 160.00;
                 break;
        case M2: price = 300.00;
                 break;
        case M3: price = 200.00;
                 break;
        case S1: price = 30.50;
                 break;
        case S2: price = 120.00;
                 break;
        case S3: price = 65.00;
                 break;
        case B1: price = 15.50;
                 break;
        case B2: price = 75.00;
                 break;
        case B3: price = 40.75;
                 break;
        case P1: price = 20.00;
                 break;
        case P2: price = 50.75;
                 break;
        case P3: price = 75.50;
                 break;
        case F1: price = 350.00;
                 break;
        case F2: price = 750.00;
                 break;
        case F3: price = 250.00;
                 break;
    }
    amt = price * qty;
    
    printf("nAmount: %.2f", amt);
}
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Read inputs from stdin

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#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
}