+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/47 - Caesar Cipher/3_caesar_cipher.js b/47 - Caesar Cipher/3_caesar_cipher.js
new file mode 100644
index 00000000..616ac763
--- /dev/null
+++ b/47 - Caesar Cipher/3_caesar_cipher.js
@@ -0,0 +1,45 @@
+
+function main(x) { // x identifies from which button call is being made: Encrypt or Decrypt
+ var entry_text = document.getElementById('entry').value
+ var key_val = parseInt(document.getElementById('key').value) // Reading and storing both the inputs
+ key_val = key_val % 26
+ if(x===2){
+ key_val = (-1) * key_val // If call is for Decrypt then key value entered becomes negative
+ }
+ var final_string = ""
+ for (var i = 0; i < entry_text.length; i++) {
+ final_string = final_string + change(entry_text.charAt(i), key_val)
+ }
+ out_ele = document.getElementById('output')
+ out_ele.style.display = final_string === "" ? "none":"flex"
+ out_ele.innerHTML = final_string
+}
+
+function isUpperCase(str) { // function to check if letter/word is uppercase or not
+ return str === str.toUpperCase()
+}
+
+function change(ch, key){ // function to shift alphabets according to the key value
+ if (!(/[a-zA-Z]/).test(ch)){ // checks for symbol and returns without any change if found
+ return ch
+ }
+ if(isUpperCase(ch)){
+ let no = (ch.charCodeAt(0) + key - 65) % 26 + 65
+ if(no < 65){
+ return (String.fromCharCode(no+26))
+ }
+ else{
+ return (String.fromCharCode(no))
+ }
+ }
+ else{
+ let no = (ch.charCodeAt(0) + key - 97) % 26 + 97
+ if(no < 97){
+ return (String.fromCharCode(no+26))
+ }
+ else{
+ return (String.fromCharCode(no))
+ }
+ }
+
+}
\ No newline at end of file
diff --git a/index.html b/index.html
index b3ff8580..7e57b175 100644
--- a/index.html
+++ b/index.html
@@ -345,6 +345,13 @@
+