#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>

// A simple C function to add two numbers
int c_add(lua_State *L) {
    double a = luaL_checknumber(L, 1);
    double b = luaL_checknumber(L, 2);
    lua_pushnumber(L, a + b);
    return 1; // one return value
}

int main(void) {
    lua_State *L = luaL_newstate();
    luaL_openlibs(L); // Load Lua standard libraries

    const lua_Number ver = lua_version(NULL);

    printf("Lua version: %.2f\n", ver);
    printf("Lua version: %s\n", LUA_VERSION);

    // Register the C function as a global Lua function
    lua_register(L, "c_add", c_add);

    // Run the Lua script
    if (luaL_dofile(L, "script.lua") != LUA_OK) {
        fprintf(stderr, "Error: %s\n", lua_tostring(L, -1));
        lua_pop(L, 1); // remove error message
    }

    lua_close(L);
    return 0;
}