Lua function nested call

Lua in function Calls can be nested , namely , We can call another function in one function .

Lua Function nested call

grammar

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       function function_name(param)
       
       
  function_name1()
       
       
  function_name2()
       
       
end
      
      
      
      

       
       
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explain
We are in function function_name Inside , I called the function function_name1 and function_name2.

Case study

Find the sum of the factorials
Lua Function nested call , Realize the sum of factorials

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       #!/usr/bin/lua
       
       
print("haicoder(www.haicoder.net)\n")
       
       
function factorial(num)
       
       
  local ret = 1
       
       
  for i = 1, num do
       
       
    ret = ret * i
       
       
  end
       
       
  return ret
       
       
end
       
       
function factorialSum(n)
       
       
  local ret = 0
       
       
  for i = 1, n do
       
       
    ret = ret + factorial(i)
       
       
  end
       
       
  return ret
       
       
end
       
       
print(string.format("factorialSum = %d", factorialSum(10)))
      
      
      
      

       
       
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After program running , The console output is as follows ：

We first define a function factorial, This function is used to calculate the passed in parameters num The factorial , next , We define a function again factorialSum, Sum for factorial calculation .

In function factorialSum Inside , We call the function again factorial, therefore , Here is to call the function in the function .

Lua Summary of function nested calls

Lua Functions in can be called nested , namely , We can call another function in one function .