Smoothing with only one line

code/simple/simple.ino

@@ -1,32 +1,29 @@
-int switch1;
-float switch1Smoothed;
-float switch1Prev;
-
-void setup() {
-
-  Serial.begin(115200);
-
-  pinMode(12, INPUT_PULLUP);
-
-}
-
-void loop() {
-
-  switch1 = digitalRead(12);      // read switch
-  switch1 = switch1 * 100;        // multiply by 100
-
-  // *** smoothing ***
-
-  switch1Smoothed = (switch1 * 0.05) + (switch1Prev * 0.95);
-
-  switch1Prev = switch1Smoothed;
-
-  // *** end of smoothing ***
-
-  Serial.print(switch1);                  // print to serial terminal/plotter
-  Serial.print(" , ");   
-  Serial.println(switch1Smoothed);
-
-  delay(10);                      // run loop 100 times/second
-
+int switch1;
+float switch1Smoothed = 0;
+
+void setup() {
+
+  Serial.begin(115200);
+
+  pinMode(12, INPUT_PULLUP);
+
+}
+
+void loop() {
+
+  switch1 = digitalRead(12);      // read switch
+  switch1 = switch1 * 100;        // multiply by 100
+
+  // *** smoothing ***
+
+  switch1Smoothed = (switch1 * 0.05) + (switch1Smoothed * 0.95);
+
+  // *** end of smoothing ***
+
+  Serial.print(switch1);                  // print to serial terminal/plotter
+  Serial.print(" , ");   
+  Serial.println(switch1Smoothed);
+
+  delay(10);                      // run loop 100 times/second
+
 }