Input and Output | HackerRank

Goal

Read 3 numbers from stdin and print their sum to stdout

Solution

This challenge is to practice reading input from stdin(standard input stream) and printing out to stdout(standard output stream).

// Input and Output

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int a, b,c ;
    int result = 0;
    cin >> a >> b >> c;
    result = a + b + c;
    cout << result << endl;
    return 0;
}

Say "Hello, World!" With C++ | HackerRank

Goal

Solution

This is simple challenge to print "Hello, World!" to stdout. We can use easily an object of class iostream. "std::cout."

// Say "Hello, World!" With C++

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

int main() {

    cout << "Hello, World!" << endl;
    return 0;
}

Today, I will show how to convert m4a file into mp3 file in python.

My test environment is OS : Windows 10 and Python version : 3.7.6

Convert m4a file into mp3 file in Python

Firstly, you need to install python library "pydub" 

But to use pydub library, you need to install ffmpeg or libav.

You can install ffmpeg-downloader package with below command.

pip install ffmpeg-downloader
ffdl install --add-path

The --add-path option adds the installed FFmpeg folder to the user's system path. In Windows, you need to add your PATH to use ffmpeg library. After add PATH, please reopen python interpretor or other script editor to run ffmpeg properly.

If you have other OS, you can check ffmpeg homepage or pydub github page. They explain details how to install ffmpeg in your OS.

I provide you sample m4a file to test your script. You can see more free m4a files here.

The sample source code is below.

from pydub import AudioSegment

song = AudioSegment.from_file("sample3.m4a")
song.export("sample3.mp3", format="mp3")

If you look at pydub github page, you can convert m4a file into any audio format file.

If you have any question, please write a comment!