Data commit

Task/Caesar-cipher/V-(Vlang)/caesar-cipher.v

@@ -0,0 +1,40 @@
+import rand
+
+const
+(
+	lo_abc = 'abcdefghijklmnopqrstuvwxyz'
+	up_abc = 'ABCDEFGHIJKLMNIPQRSTUVWXYZ'
+)
+
+fn main() {
+	key := rand.int_in_range(2, 25) or {13}
+	encrypted := caesar_encrypt('The five boxing wizards jump quickly', key)
+	println(encrypted)
+	println(caesar_decrypt(encrypted, key))
+}
+
+fn caesar_encrypt(str string, key int) string {
+	offset := key % 26
+	if offset == 0 {return str}
+	mut nchr := u8(0)
+	mut chr_arr := []u8{}
+	for chr in str {
+		if chr.ascii_str() in up_abc.split('') {
+			nchr = chr + u8(offset)
+			if nchr > u8(90) {nchr -= 26}
+		}
+		else if chr.ascii_str() in lo_abc.split('') {
+			nchr = chr + u8(offset)
+			if nchr > u8(122) {nchr -= 26}
+		}
+		else {
+			nchr = chr
+		}
+		chr_arr << nchr
+	}
+	return chr_arr.bytestr()
+}
+
+fn caesar_decrypt(str string, key int) string {
+	return caesar_encrypt(str, 26 - key)
+}