#!/usr/bin/env bellos
# File: control_structures_with_seq.bellos

# 1. Simple echo and variable assignment
echo "Demonstrating if-else statements:"
x=10

# 2. If-else statement
if [ $x -gt 5 ]
then
    echo "x is greater than 5"
else
    echo "x is not greater than 5"
fi

# 3. Nested if-else
echo "Demonstrating nested if-else:"
y=20
if [ $x -gt 5 ]
then
    if [ $y -gt 15 ]
    then
        echo "x is greater than 5 and y is greater than 15"
    else
        echo "x is greater than 5 but y is not greater than 15"
    fi
else
    echo "x is not greater than 5"
fi

# 4. While loop
echo "Demonstrating while loop:"
counter=0
while [ $counter -lt 5 ]
do
    echo "Counter: $counter"
    counter=$((counter + 1))
done

# 5. For loop
echo "Demonstrating for loop:"
for i in 1 2 3 4 5
do
    echo "Iteration: $i"
done

# 6. For loop with seq command
echo "Demonstrating for loop with seq command:"
for i in $(seq 1 5)
do
    echo "Number from seq: $i"
done

# 7. Using seq with different arguments
echo "Demonstrating seq with different arguments:"
echo "seq 3 (implicit start at 1, increment by 1):"
for i in $(seq 3)
do
    echo "Value: $i"
done

echo "seq 2 5 (start at 2, increment by 1):"
for i in $(seq 2 5)
do
    echo "Value: $i"
done

echo "seq 0 2 10 (start at 0, increment by 2):"
for i in $(seq 0 2 10)
do
    echo "Value: $i"
done

# 8. Case statement
echo "Demonstrating case statement:"
fruit="apple"
case $fruit in
    "apple")
        echo "It's an apple"
        ;;
    "banana")
        echo "It's a banana"
        ;;
    "orange")
        echo "It's an orange"
        ;;
    *)
        echo "Unknown fruit"
        ;;
esac

# 9. Using seq in arithmetic operations
echo "Using seq in arithmetic operations:"
sum=0
for i in $(seq 1 5)
do
    sum=$((sum + i))
    echo "Running sum: $sum"
done
echo "Final sum of numbers 1 to 5: $sum"

echo "Control structures and seq demonstration completed."