c调用lua函数

1.lua函数如下：

--add.luafunction add(a,b)    return a+bend

2.c调用lua的函数，代码如下：

#include <stdio.h>#include "lua.h"int main(int argc, char const *argv[]){/* code */lua_State* L = luaL_newstate();if((luaL_loadfile(L,"./add.lua")) || (lua_pcall(L,0,0,0))){fprintf(stderr, "error:%s\n", lua_tostring(L,-1));return;}lua_getglobal(L,"add"); //function to be calledlua_pushnumber(L,5); //1st argslua_pushnumber(L,10); //2st args/* do the call (2 arguments, 1 result) */if (lua_pcall(L, 2, 1, 0) != 0)error(L, "error running function `f': %s",lua_tostring(L, -1));/* retrieve result */if (!lua_isnumber(L, -1))error(L, "function `add' must return a number");double c = lua_tonumber(L, -1);lua_pop(L, -1); /* pop returned value */fprintf(stderr, "c = %g\n",c);lua_close(L);return 0;}