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methods.go
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methods.go
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package main
import (
"fmt"
"os"
"strconv"
)
type ar2x2 [2][2]int
// Traditional Add() function
func Add(a, b ar2x2) ar2x2 {
c := ar2x2{}
for i := 0; i < 2; i++ {
for j := 0; j < 2; j++ {
c[i][j] = a[i][j] + b[i][j]
}
}
return c
}
// Type method Add()
func (a *ar2x2) Add(b ar2x2) {
for i := 0; i < 2; i++ {
for j := 0; j < 2; j++ {
a[i][j] = a[i][j] + b[i][j]
}
}
}
// Type method Subtract()
func (a *ar2x2) Subtract(b ar2x2) {
for i := 0; i < 2; i++ {
for j := 0; j < 2; j++ {
a[i][j] = a[i][j] - b[i][j]
}
}
}
// Type method Multiply()
func (a *ar2x2) Multiply(b ar2x2) {
a[0][0] = a[0][0]*b[0][0] + a[0][1]*b[1][0]
a[1][0] = a[1][0]*b[0][0] + a[1][1]*b[1][0]
a[0][1] = a[0][0]*b[0][1] + a[0][1]*b[1][1]
a[1][1] = a[1][0]*b[0][1] + a[1][1]*b[1][1]
}
func main() {
if len(os.Args) != 9 {
fmt.Println("Need 8 integers")
return
}
k := [8]int{}
for index, i := range os.Args[1:] {
v, err := strconv.Atoi(i)
if err != nil {
fmt.Println(err)
return
}
k[index] = v
}
a := ar2x2{{k[0], k[1]}, {k[2], k[3]}}
b := ar2x2{{k[4], k[5]}, {k[6], k[7]}}
fmt.Println("Traditional a+b:", Add(a, b))
a.Add(b)
fmt.Println("a+b:", a)
a.Subtract(a)
fmt.Println("a-a:", a)
a = ar2x2{{k[0], k[1]}, {k[2], k[3]}}
a.Multiply(b)
fmt.Println("a*b:", a)
a = ar2x2{{k[0], k[1]}, {k[2], k[3]}}
b.Multiply(a)
fmt.Println("b*a:", b)
}