learn_golang/coursera/intro_course1/week3/assignments/slice.go

// A maximum of 3 points will be given for the first test execution, if the program correctly prints the sorted slice
// after entering three distinct integers. **Points are awarded incrementally each time that an integer
// is added and it correctly prints the sorted slice.

//A maximum of 2 points will be given for the second test execution,
// if the program correctly prints the sorted slice after entering four distinct integers.
// **Points are awarded if it correctly prints the sorted slice after adding the fourth integer.

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func stringsToIntegers(inputStrings []string) []int {
	integers := make([]int, len(inputStrings))
	for i, v := range inputStrings {
		intValue, err := strconv.Atoi(v)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Error: %s could not be converted to integer", v)
			os.Exit(1)
		}
		integers[i] = intValue
	}
	return integers
}

func sortIntegers(integers []int) {
	//  Insertion sort O(n^2)
	i := 1
	for i < len(integers) {
		insert := integers[i]
		j := i - 1
		for j >= 0 {
			if insert < integers[j] {
				integers[j+1] = integers[j]
				j -= 1
			} else {
				break
			}
		}
		integers[j+1] = insert
		i += 1
	}
}

func main() {
	inputReader := bufio.NewReader(os.Stdin)
	fmt.Println("Enter a line of text: ")
	line, _ := inputReader.ReadString('\n')

	integersList := stringsToIntegers(strings.Split(line[:len(line)-1], " "))
	fmt.Println("You entered:", integersList)
	sortIntegers(integersList)
	fmt.Println("Those sorted are:", integersList)
}