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+// Substitutition scheme of Caesar cipher
+
+// Move scilab to current file directory
+[u,t,n] = file()
+n = strcat(n)
+file_name = basename(n)+fileext(n)
+file_name = strcat(file_name)
+ind=strindex(n,file_name)
+path = part(n,1:ind-1)
+chdir(path)
+
+exec("Chapter_2.sci",-1)
+
+a = ascii('A')
+pt = "I LOVE YOU"
+printf("Plaintext:\n\t%s\n",pt)
+
+//Encryption using encrypt_caesar function from dependency file
+printf("Encrypted text:\n\t%s",encrypt_caesar(pt))
+
+// A scheme for codifying messages 
+//(replacing each alphabet with an alphabet three places down the line)