Solution: rectangular STDIN

---

examples/rectangular-stdin/rectangular_stdin.go

package main

import (
    "fmt"
    "strconv"
)

func main() {
    var widthStr string
    fmt.Print("width: ")
    fmt.Scan(&widthStr)

    var lengthStr string
    fmt.Print("length: ")
    fmt.Scan(&lengthStr)

    // convert to integer

    width, errw := strconv.Atoi(widthStr)
    length, errl := strconv.Atoi(lengthStr)
    if errw == nil && errl == nil {
        fmt.Println(width)
        fmt.Println(length)
        area := width * length
        circumference := 2 * (width + length)
        fmt.Printf("Area: %v\n", area)
        fmt.Printf("Cirumference: %v\n", circumference)
    }
}