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function function_name(argument1, argument2, ...)
{
    function body
}

# Returns the minimum value
function find_min(num1, num2)
{
  if (num1 < num2)
    return num1
  return num2
}

# Returns the maximum value
function find_max(num1, num2)
{
  if (num1 > num2)
    return num1
  return num2
}

# Main function
function main(num1, num2)
{
  # Find the minimum value
  result = find_min(10, 20)
  print "Minimum =", result

  # Find the maximum value
  result = find_max(10, 20)
  print "Maximum =", result
}

# Script execution starts here
BEGIN {
  main(10, 20)
}

$ awk -f functions.awk 
Minimum = 10
Maximum = 20