ealvar3z solution for week 135

2 files changed, 136 insertions, 0 deletions

diff --git a/challenge-135/ealvar3z/go/ch-1.go b/challenge-135/ealvar3z/go/ch-1.go
new file mode 100644
index 0000000000..696c122d24
--- /dev/null
+++ b/challenge-135/ealvar3z/go/ch-1.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// TASK #1: Middle 3-digits
+// You are given an integer.
+// Write a  script find out the middle 3-digits of  the given integer, if possible otherwise throw sensible
+// error.
+
+// Example 1
+// Input: $n = 1234567
+// Output: 345
+
+// Example 2
+// Input: $n = -123
+// Output: 123
+
+// Example 3
+// Input: $n = 1
+// Output: too short
+
+// Example 4
+// Input: $n = 10
+// Output: even number of digits
+
+func main() {
+	r := bufio.NewReader(os.Stdin)
+
+	// labeled loop for easier debugging
+repeat:
+	for {
+		txt, err := r.ReadString('\n')
+		if err != nil {
+			break
+		}
+		// strip the newline
+		txt = strings.TrimRight(txt, "\n")
+
+		// remove the leading sign, if there are any
+		if txt[0:1] == "-" || txt[0:1] == "+" {
+			txt = txt[1:]
+		}
+
+		// check if char is a num
+		for _, c := range txt {
+			if c < '0' || c > '9' {
+				fmt.Println("not an integer")
+				continue repeat
+			}
+		}
+		// is it an even num?
+		if len(txt)%2 == 0 {
+			fmt.Println("even number of digits")
+			continue repeat
+		}
+		// how long is this things?
+		if len(txt) < 3 {
+			fmt.Println("too short")
+			continue repeat
+		}
+		// snatch the 3 middle ones
+		fmt.Printf("%+v\n", txt[(len(txt)-3)/2:(len(txt)+3)/2])
+	}
+}
diff --git a/challenge-135/ealvar3z/go/ch-2.go b/challenge-135/ealvar3z/go/ch-2.go
new file mode 100644
index 0000000000..261847beac
--- /dev/null
+++ b/challenge-135/ealvar3z/go/ch-2.go
@@ -0,0 +1,67 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+)
+
+// You are given 7-characters alphanumeric SEDOL.
+// Write a script to validate the given SEDOL. Print 1 if it is a valid SEDOL otherwise 0.
+// For more information about SEDOL, please checkout the wikipedia page.
+
+//  Example 1
+// Input: $SEDOL = '2936921'
+// Output: 1
+
+//  Example 2
+// Input: $SEDOL = '1234567'
+// Output: 0
+
+//  Example 3
+// Input: $SEDOL = 'B0YBKL9'
+// Output: 1
+
+func main() {
+	r := bufio.NewReader(os.Stdin)
+	// set the weights per the wikipedia page
+	w := []rune{1, 3, 1, 7, 3, 9, 1}
+
+	for {
+		txt, err := r.ReadString('\n')
+		if err != nil {
+			break
+		}
+		// strip new lines
+		txt = strings.TrimRight(txt, "\n")
+
+		// check for syntax
+		m, _ := regexp.MatchString("^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}[0-9]$", txt)
+
+		if !m {
+			fmt.Println("Invalid SEDOL Number")
+			continue
+		}
+		// check the sum
+		var check rune = 0
+		for i, rune := range txt {
+			if rune <= '9' {
+				// too much magic in that example
+				// i'll simply substract from the
+				// upper limit of the rune
+				rune -= '0'
+			} else {
+				rune -= 'A'
+			}
+			// bounce it against the weights
+			check += w[i] * rune
+		}
+		if check%10 == 0 {
+			fmt.Println("1")
+		} else {
+			fmt.Println("0")
+		}
+	}
+}