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This article will explain in detail how to call C function in Lua. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Lua calls functions in C language to pass parameters through the stack, which is consistent with the implementation of internal function calls in most programming languages.

# include

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Static int i_add (lua_State * L)

{

/ / get the first function argument

Double a = luaL_checknumber (L, 1)

Printf ("first parameter:% f\ n", a)

/ / get the second function parameter

Double b = luaL_checknumber (L, 2)

Printf ("second parameter:% f\ n", b)

/ / set the value returned by the function

Lua_pushnumber (L, a + b)

/ / the number of values returned by the function, where the return value is 1

Return 1

}

Static int i_swap (lua_State * L)

{

Int I = lua_tointeger (L, 1)

Int j = lua_tointeger (L, 2)

Printf ("% d and% d swap position\ n", I, j)

Lua_pushinteger (L, j)

Lua_pushinteger (L, I)

Return 2

}

/ / calculate the Fibonacci series

Static int i_fib (lua_State * L)

{

/ / the lua_Integer length is 64 bits to prevent overflow (in fact, even 64 bits will overflow when the value of n reaches 100 or so)

Lua_Integer sum = 0

Lua_Integer a = 0; / / n-2

Lua_Integer b = 0; / / n-1

Int n = lua_tointeger (L, 1)

Int I = 0

While (I n)

Return sum

End

N = 10000000-the number of Fibonacci series calculated

-- calculate using lua

Start = current_time ()

Fib_lua (n)

LuaCost = current_time ()-start

Print (luaCost)

-- using C language to calculate

Start = current_time ()

Fib_c (n)

CCost = current_time ()-start

Print (cCost)

-- calculating the time-consuming ratio between lua and C language

Print (luaCost / cCost)

Execute lua test.lua to get the following result:

First parameter: 1.000000

Second parameter: 2.000000

3.0

2333 and 666swap positions

666 2333

1887

forty

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