gonuts

Playing around with a bit of Golang

Overview

This repo is contains implementations to exercises proposed in An Introduction to Programming in Go which I've found interesting to share.

Chapter 5 - Control Structures

fizzbuzz.go

2. Write a program that prints out all the numbers evenly divisible by 3 between 1 and 100. (3, 6, 9, etc.)

for i := 0; i < 100; i++ {
  if i%3 == 0 {
    fmt.Println(i)
  }
}

3. Write a program that prints the numbers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz".

for i := 0; i < 100; i++ {
  fmt.Println(FizzBuzz(i))
}

Chapter 6 - Arrays, Slices and Maps

min.go

4. Write a program that finds the smallest number in this list:

x := []int{
  48, 96, 86, 68,
  57, 82, 63, 70,
  37, 34, 83, 27,
  19, 97, 9, 17,
}

fmt.Println(Min(x, x[0]))

Chapter 7 - Functions

half.go

2. Write a function which takes an integer and halves it and returns true if it was even or false if it was odd. For example, half(1) should return (0, false) and half(2) should return (1, true).

3. Write a function with one variadic parameter that finds the greatest number in a list of numbers.

func greatest(numbers ...int) int {
  max := numbers[0]
  for _, number := range numbers {
    if number > max {
      max = number
    }
  }

  return max
}

4. Write a makeOddGenerator function that generates odd numbers.

5. Write a Fibonacci sequence function that can find fib(n).

Chapter 8 - Pointers

swap.go

5. Write a program that can swap two integers (x := 1; y := 2; swap(&x, &y) should give you x=2 and y=1).

func swap(x, y *int) {
  tmp := new(int)
  *tmp = *x
  *x = *y
  *y = *tmp
}

Chapter 9 - Structs and Interfaces

3. Add a perimeter method to the Shape interface which calculates the perimeter of a shape. Implement the method for Circle and Rectangle.