Write a program name dollars that calculates and displays the conversion of an entered number of dollars into currency , 10s, 5s, and 1s.

I will code in Javascript.

Preconditions:

function Dollars(dollar) {

//declare and initialize the variables.

 var twenties = 0;

 var tens = 0;

 var fives = 0;

 var ones = 0;

//If dollar is greater or equals 20, divide dollar by 20 and save it into the variable twenties. Then, save the remainder into the variable dollar.  

 if(dollar >= 20){

   twenties = Math.floor(dollar/20);

   dollar = dollar % 20;

 }

//If dollar is greater or equal 10, divide dollar by 10 and save it into the variable twenties. Then, save the remainder into the variable dollar.  

 if(dollar>=10){

   tens = Math.floor(dollar/10);

   dollar = dollar % 10;

 }

//If dollar is greater or equal 5, divide dollar by 5 and save it into the variable twenties. Then, save the remainder into the variable dollar.  

 if(dollar>=5){

   fives = Math.floor(dollar/5);

   dollar = dollar % 5;

 }

//If dollar is greater or equal 1, divide dollar by 1 and save it into the variable twenties. Then, save the remainder into the variable dollar.  

 if(dollar>=1){

   ones = Math.floor(dollar/1);

   dollar = dollar % 1;

 }

//At this point, dollar is equal 0.It's time to display the conversion.

Console.log('20s :' + twenties);

Console.log('10s :' + tens);

Console.log('5s :' + fives);

Console.log('1s :' + ones);

}

Explanation:

The variable Math.floor(num) is used to round a number downward to its nearest integer.

For example, if dollar=57:

twenties = dollar/20 will be 57/20 = 2

dollar = dollar % 20 will be 57 % 20 = 17

tens = dollar/10 will be 17/10 = 1

dollar = dollar % 10 will be 17 % 10 = 7

fives = dollar/5 will be 7/5 = 1

dollar = dollar % 5 will be 7 % 5 = 2

ones = dollar/1 will be 2/1 = 2

dollar = dollar % 1 will be 0 % 5 = 0

universal windows platform is an open source api created by microsoft and first introduced in windows 10. the purpose of this platform is to develop universal apps that run on windows 10, windows 10 mobile, xbox one and hololens without the need to be re-written for each. it supports windows app development using c++, c#, vb.net, and xaml. the api is implemented in c++, and supported in c++, vb.net, c#, f# and javascript. designed as an extension to the windows runtime platform first introduced in windows server 2012 and windows 8, uwp allows developers to create apps that will potentially run on multiple types of devices.

so much for the extra points :