How to call C function in Lua
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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.
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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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