comments, rename variables to clarify

main.go

@@ -7,37 +7,46 @@ import (
 )
 
 func main() {
+	// Random seed based on time when program runs
 	rand.Seed(time.Now().UTC().UnixNano())
 
-	var balance, investedPercentage, winningPercentage float64
+	// Initialize variables
-	balance = 100
+	var startingBalance, investedPercentage, winningPercentage float64
+	startingBalance = 100
 	investedPercentage = 0.80
 	winningPercentage = 0.70
 	discreteCompoundingPeriods := 200
 	numSimulations := 16
 	outputChannel := make(chan float64)
 
+	// Start simulations
 	for i := 0; i < numSimulations; i++ {
-		go simulation(balance, investedPercentage, winningPercentage, discreteCompoundingPeriods, outputChannel)
+		go simulation(startingBalance, investedPercentage, winningPercentage, discreteCompoundingPeriods, outputChannel)
 	}
 
+	// Wait for simulations to finish and write output
 	for i := 0; i < numSimulations; i++ {
 		fmt.Println(<-outputChannel)
 	}
-
 }
 
+// discrete period, symmetric payoff simulator
 func simulation(startingBalance, investedPercentage, winningPercentage float64, discreteCompoundingPeriods int, outputChannel chan float64) {
 	balance := startingBalance
+
+	// Each iteration is one bet
 	for i := 0; i < discreteCompoundingPeriods; i++ {
-		investedAmount := balance * investedPercentage
+		// Each bet is a fixed percentage of the balance
+		betAmount := balance * investedPercentage
 		if rand.Float64() <= winningPercentage {
 			// you win
-			balance += investedAmount
+			balance += betAmount
 		} else {
 			// you lose
-			balance -= investedAmount
+			balance -= betAmount
 		}
 	}
+
+	// Calculate and report the result on the outputChannel
 	outputChannel <- (balance / startingBalance)
 }