Question

JavaScript Programming Assignment

PLEASE NOTE:  You must create and call a main function, and if instructed include additional functions called by the main. Make sure to use ES6 style of keywords => instead of the older function and for local scope variables use the keyword let and not a keyword var. Make sure to follow the requirements and recheck before submitting.

PROJECT GOAL:

Create a program that simulates tossing a coin. This program should be titled flippingacoin.js and will require you to include two functions, one of them is called main and the other flip. The use of a loop is required for this program. Make sure the program includes a user prompt asking how many times to toss the coin. Program a function called flip which does not include parameters and randomly (using math library random) returns either a String called heads or one called tails. Call onto this function in main as many times as requested by using a loop. Make sure to report the results.

Example output:

How many times should I toss the coin? 4000

Results of 4000 tosses.

Heads: # 2635, Tails: 1365

NOTE: End users should be able to enter a higher number of tosses such as 300500020 and receive accurate results.

Thank you for your help with this project.

Answer 1

// Javascript program that simulates tossing a coin.

let readline = require('readline-sync'); // module for taking input

// flip function that returns "heads" is random() returns a value <0.5 else "tails"
// simulates the flipping of a fair coin where probability of heads and tails are equal
var flip = () =>{
   if(Math.random() < 0.5)
       return "heads";
   else
       return "tails";
}

// main function that includes a user prompt asking how many times to toss the coin.
// and records the number of heads and tails for that number of coin toss
var main = () =>{
  
   //input of number of coin toss
   let num_toss = parseInt(readline.question("How many times should I toss the coin?"));
   let i;
   let num_heads = 0, num_tails = 0; // counter to store the number of heads and tails
   // loop to simulate the coin flip
   for(i=0;i<num_toss;i++)
   {
       let result = flip(); // get the result of one flip
       // if we get heads increment the number of heads
       if(result === "heads")
           num_heads++;
       else // increment the number of tails
            num_tails++;
   }
   // output the result
   console.log("Results of "+num_toss+" tosses.");
   console.log("Heads: # "+num_heads+", Tails: "+num_tails);
}

// call the main function
main()

//end of program

Output: