Learn C++ Tutorial 1 - Day 1 | Basics

[abhi3700]

What Will I Learn?

You are going to learn a programming language called C++ (most heard but not coded often :P).

• You will learn every bit of C++ in the series.
• You will learn Object Oriented Programming (OOP) in particular.
• You will learn to increase C++ computing performance by modifying code accordingly (very important for a distributed network like Blockchain).
• Eventually, you will learn to write smart contract using C++ language.

Requirements

These are the following requirements for following this video tutorial:

• Basic Maths logic - Addition, Subtraction, Division, ....
• C++ IDE setup required for practising the tutorial

Difficulty

This is a basic level tutorial.

Description

This is a tutorial series on learning C++ programming language.

I am deeply involved with Blockchain technology. So, this is an endeavor to make Developers equipped with the power of coding any applications using C++ 's Object Oriented Programming (OOP) tool.

Additionally in the end of this series, I will be covering some IEEE papers on improving C++ codes' computing performance using some shortcuts.

Tutorial Contents

Installation guide -
This is for Windows & Ubuntu lovers in particular. Run linux subsystem over Windows OS using WSL.

1. And editor like Sublime Text 3
2. Use gcc compiler for Linux (ubuntu). Install it using sudo apt-get install g++
3. Compile C++ codes (.cpp format) e.g. File - "hello.cpp" using
   g++ hello.cpp -o hello.out command & then
4. Execute using ./hello.out command

This tutorial covers basic concepts which are very easy to understand.
The questions along with solutions is as follows: -

1. Hello World

Question:
Print "Hello World"

Solution:

/*C++ Program to Print "Hello World"*/
#include <iostream>

int main()
{
    std::cout<<"Hello World"<<std::endl;
    return 0;
}

---

2. Print Numbers

Question:
Enter any integer and print that number

Solution:

/*C++ Program to Print Number Entered by User*/
#include <iostream>

int main()
{
    int num;

    //input the number
    std::cout<<"Enter an integer \n";
    std::cin>>num;

    // Print the number
    std::cout<<"You entered "<<num<<std::endl;
    return 0;
}

---

3. Add 2 numbers

Question:
Program to add 2 Numbers.

Solution:

/*C++ Program to Add 2 Numbers*/
#include <iostream>

int main()
{
    int a, b, c;
    // Enter a
    std::cout<<"Enter a: \n";
    std::cin>>a;

    // Enter b
    std::cout<< "Enter b: \n";
    std::cin>>b;

    c = a + b;
    std::cout<<"The addition of "<<a<<" and "<<b<<" is "<<c <<std::endl;
    return 0;
}

---

4. Area of Circle

Question:
Program to calculate Area of Circle.

Solution:

/*C++ Program on Area of Circle*/
#include <iostream>

int main()
{
    int r; // radius of the circle
    double area;

    std::cout<<"Enter the radius :\n";
    std::cin>> r;

    // the area
    area = 3.14 * r * r;
    std::cout<<"The area of the circle: "<< area<<std::endl;
    return 0;
}

---

5. Divisor & Dividend

Question:
Program to find Divisor and Dividend

Solution:

/*C++ Program to find Divisor and Dividend*/
#include <iostream>

int main()
{
    int dividend, divisor, quotient, remainder;

    // dividend
    std::cout<<"Enter the dividend: \n";
    std::cin>>dividend;

    // divisor
    std::cout<<"Enter the divisor: \n";
    std::cin>>divisor;

    quotient = dividend/divisor; //quotient
    remainder = dividend % divisor; //remainder

    std::cout<<"The quotient is "<<quotient<<std::endl;
    std::cout<<"The remainder is "<<remainder<<std::endl;
    return 0;
}

---

6. Convert *C to *F

Question:
Program to convert Celsius and Fahrenheit

Solution:

/*C++ Program to convert Celsius and Fahrenheit*/
#include <iostream>

int main()
{
    float celsius, fahrenheit;

    std::cout<<"Enter temperature in Celsius: \n";
    std::cin>>celsius;

    fahrenheit = celsius * (9.0/5.0) + 32;
    std::cout<<"The temperature in Celsius is "<< celsius<<std::endl;
    std::cout<<"The temperature in Fahrenheit is "<< fahrenheit<<std::endl;

    return 0;
}

---

7. Leap Year

Question:
Program to check a leap year

HINT:
(Source)
To determine whether a year is a leap year, follow these steps:

1. If the year is evenly divisible by 4, go to step 2. ...
2. If the year is evenly divisible by 100, go to step 3. ...
3. If the year is evenly divisible by 400, go to step 4. ...
4. The year is a leap year (it has 366 days).
5. The year is not a leap year (it has 365 days).

Solution:

/*C++ Program to check a leap year*/
#include <iostream>

int main()
{
    int year; 
    std::cout<<"Enter a year: \n";
    std::cin>>year;

    if (year % 4 == 0)
    {
        if (year % 100 == 0)
        {
            if (year % 400 == 0) {
                std::cout<<"It is a leap year"<<std::endl;
            } 
            else {
                std::cout<<"It is NOT a leap year"<<std::endl;
            }
        } 
        else 
        {
                std::cout<<"It is NOT a leap year"<<std::endl;

        } 
    } 
    else 
    {
                std::cout<<"It is NOT a leap year"<<std::endl;

    }
    return 0;
}

---

8. ASCII

Question:
Program to Print ASCII value

Solution:

/*C++ Program to Print ASCII value*/
#include <iostream>

int main()
{
    char c;
    std::cout<<"Enter a char: \n";
    std::cin>>c;

    std::cout<<"The ASCII value of "<<c<< " is "<< int(c)<<std::endl;
    return 0;
}

---

9. Switch statement

Question:
Program to understand Switch statement

Solution:

/*C++ Program to understand Switch*/
#include <iostream>

int main()
{
    int choice;

    std::cout<<"Enter an integer number (1-5): \n";
    std::cin>>choice;

    switch(choice){
        case(1): std::cout<<"You entered 1"<<std::endl;
                break;
        case(2): std::cout<<"You entered 2"<<std::endl;
                break;
        case(3): std::cout<<"You entered 3"<<std::endl;
                break;
        case(4): std::cout<<"You entered 4"<<std::endl;
                break;
        case(5): std::cout<<"You entered 5"<<std::endl;
                break;
        default:
                std::cout<<"Invalid choice."<<std::endl;
                break;
    }
    return 0;
}

---

10. If-else Statement

Question:
Program to understand If-else

Solution:

/*C++ Program to understand If-else*/
#include <iostream>

int main()
{
    int n; 
    std::cout<<"Enter an integer: \n";
    std::cin>>n;

    if(n % 2 == 0){
        std::cout<<"The number is EVEN."<<std::endl;
    } else {
        std::cout<<"The number is ODD."<<std::endl;
    }
    return 0;
}

---

Follow the codes in the Tutorial Notebook.

Curriculum

There is no related tutorial as it is the first one in the series.

---

Posted on Utopian.io - Rewarding Open Source Contributors

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