diff --git a/docs/demos/calc.grnd b/docs/demos/calc.grnd
new file mode 100755
index 0000000..4d87056
--- /dev/null
+++ b/docs/demos/calc.grnd
@@ -0,0 +1,107 @@
+#!/usr/bin/env ground
+
+@begin
+stdout "Calculation: "
+stdin &calc
+getstrsize $calc &calcsize
+set &counter 0
+set &left ""
+set &right ""
+set &operator ' '
+set &isRight false
+
+## Preprocessing
+
+# Loop to parse input
+@loopstart
+getstrcharat $calc $counter &char
+
+# Remove any spaces (they're inconvenient)
+equal $char ' ' &cond
+if $cond %doneif
+
+# Check for operators
+# '+' operator
+inequal '+' $char &cond
+if $cond %minusOpCheck
+set &operator $char
+set &isRight true
+jump %doneif
+
+@minusOpCheck
+# '-' operator
+inequal '-' $char &cond
+if $cond %multiplyOpCheck
+set &operator $char
+set &isRight true
+jump %doneif
+
+@multiplyOpCheck
+# '*' operator
+inequal '*' $char &cond
+if $cond %divideOpCheck
+set &operator $char
+set &isRight true
+jump %doneif
+
+@divideOpCheck
+# '/' operator
+inequal '/' $char &cond
+if $cond %endOpChecks
+set &operator $char
+set &isRight true
+jump %doneif
+
+@endOpChecks
+if $isRight %isRight
+add $left $char &left
+jump %doneif
+@isRight
+add $right $char &right
+@doneif
+add 1 $counter &counter
+inequal $counter $calcsize &cond
+if $cond %loopstart
+# End loop
+
+## Computing
+
+# Convert types
+stod $left &left
+stod $right &right
+
+# Calculations
+# Adding
+inequal $operator '+' &cond
+if $cond %subtract
+add $left $right &result
+stdlnout $result
+jump %begin
+
+# Subtracting
+@subtract
+inequal $operator '-' &cond
+if $cond %multiply
+subtract $left $right &result
+stdlnout $result
+jump %begin
+
+# Multiplying
+@multiply
+inequal $operator '*' &cond
+if $cond %divide
+multiply $left $right &result
+stdlnout $result
+jump %begin
+
+# Dividing
+@divide
+inequal $operator '/' &cond
+if $cond %error
+divide $left $right &result
+stdlnout $result
+jump %begin
+
+@error
+stdlnout "Uh oh something terribly terrible happened lmao"
+jump %begin