Generating and printing Pascal Triangle of given size implemented in Go

pascal_triangle.go

package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
)

func MakePascalTriangle(height int) [][]int {
	pt := make([][]int, height)

	for i := 0; i < height; i++ {
		pt[i] = make([]int, i+1)

		pt[i][0] = 1

		for j := 1; j < i; j++ {
			pt[i][j] = pt[i-1][j] + pt[i-1][j-1]
		}

		pt[i][i] = 1
	}

	return pt
}

func PrettyPrintPascalTriangle(height int) {
	pt := MakePascalTriangle(height)

	fieldWidth := make([]int, height)

	for idx := range fieldWidth {
		fieldWidth[idx] = len(strconv.Itoa(pt[height-1][idx])) + 1
	}

	for _, row := range pt {
		for col, item := range row {
			fmt.Printf("%-*d", fieldWidth[col], item)
		}
		fmt.Println()
	}
}

func main() {
	var size int
	var err error

	if len(os.Args) == 1 {
		size = 15
	} else {
		size, err = strconv.Atoi(os.Args[1])
	}

	if err != nil {
		log.Fatal(err)
	}

	PrettyPrintPascalTriangle(size)
}