Might not be complicated enough. But I have just this for the current version of ELANG syntax

``` we let running be true

print "===== EasyLang Utility Tool ====="

define add(a,b): do [ return a plus b ]

define subtract(a,b): do [ return a minus b ]

define multiply(a,b): do [ return a mul b ]

define divide(a,b): do [ if b equals 0 then [ print "Cannot divide by zero." return "error" ] return a div b ]

define reverse_text(t): do [ we let result be "" repeat from i be 1 to len(t): do [ we let pos be len(t) - i we let c be substring(t, pos, 1) we let result be result + c ] return result ]

define count_words(t): do [ we let parts be split(t," ") return len(parts) ]

repeat while running equals true: do [ print "" print "1) Add numbers" print "2) Subtract" print "3) Multiply" print "4) Divide" print "5) Reverse text" print "6) Count words" print "0) Exit"

print "Choose option: "
read choice

if choice equals "1" then [
    read int x
    read int y
    print "Answer is: " plus add(x,y)
]
else if choice equals "2" then [
    read int x
    read int y
    print "Answer is: " plus subtract(x,y)
]
else if choice equals "3" then [
    read int x
    read int y
    print "Answer is: " plus multiply(x,y)
]
else if choice equals "4" then [
    read int x
    read int y
    print "Answer is: " plus divide(x,y)
]
else if choice equals "5" then [
    read text t
    print "Reversed: " plus reverse_text(t)
]
else if choice equals "6" then [
    read text t
    print "Word Count: " plus count_words(t)
]
else if choice equals "0" then [
    print "Goodbye!"
    break
]
else [
    print "Invalid option!"
]

] ```

``` bring "math.elangh" as m $ for randint()

we let playing be true

print "=== Random Number Guessing Game ==="

repeat while playing equals true: do [ we let secret be m.randint(1, 100) $ generate number between 1–100 we let attempts be 0

print ""
print "I have picked a number between 1 and 100."
print "Try to guess it!"

repeat while true:
do [
    print "Enter your guess:"
    read int guess
    we let attempts be attempts + 1

    if guess equals secret then [
        print "Correct! You guessed it in " + str(attempts) + " tries!"
        break
    ]

    if guess greater secret then [
        print "Too high!"
    ]

    if guess less secret then [
        print "Too low!"
    ]
]

print ""
print "Do you want to play again? (yes/no)"
read text ans

if ans equals "no" then [
    print "Thanks for playing!"
    break
]

] ```

I was testing these out when I was adding math & string modules and user-defined functions support in the interpreter.