Chapter 1 - Syntax Basics

Exercise 1: Fill in the Blanks

The program below should take a number of cans of food and calculate their total weight. It should declare a count variable with the number of cans, and a unitWeight variable with the amount (in kilograms) that each can weighs. It should then multiply count by unitWeight, and assign the result to a new totalWeight variable. Finally, it should print the number of cans and their total weight.

Fill in the blanks in the program so that it will run and produce the specified output. Note that count will have a type of int, but unitWeight will have a type of float64, so you’ll need to do a conversion before you can multiply the two together.

_______ main

______ "fmt"

____ main() {
    ___ count int = 20
    __________ := 0.4
    totalWeight := _______(count) * unitWeight
    fmt.Println(count, "cans weigh", totalWeight, "kilograms")


20 cans weigh 8 kilograms

When you’re ready, have a look at the solution.

Exercise 2: Code Rework

Several of the variable names used in this example break Go naming conventions. The code is also somewhat longer than it needs to be. See if you can modify so that it’s shorter and follows conventions better, but still produces the same output.

package main

import (

func main() {
	var pebbleweight float64 = 0.1
	var rockweight float64 = 1.2
	var boulderweight float64 = 502.4
	var total_weight float64 = pebbleweight + rockweight + boulderweight



When you’re ready, have a look at the solution.