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nn-usb-fpga/lua/examples/lua_calls_C4/luaavg.cc
Carlos Camargo 7d9b7b803c Adding LUA tutorials: lua_calls_C1 - lua_calls_C5
Adding blinker demo: lua_blink_led
2010-09-06 20:24:53 -05:00

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942 B
C++

#include <stdio.h>
extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}
/* the Lua interpreter */
lua_State* L;
static int average(lua_State *L)
{
/* get number of arguments */
int n = lua_gettop(L);
int sum = 0;
int i;
/* loop through each argument */
for (i = 1; i <= n; i++)
{
/* total the arguments */
sum += lua_tonumber(L, i);
}
/* push the average */
lua_pushnumber(L, sum / n);
/* push the sum */
lua_pushnumber(L, sum);
/* return the number of results */
return 2;
}
int main ( int argc, char *argv[] )
{
/* initialize Lua */
L = lua_open();
/* load Lua base libraries */
luaL_openlibs(L);
/* register our function */
lua_register(L, "average", average);
/* run the script */
luaL_dofile(L, "avg.lua");
/* cleanup Lua */
lua_close(L);
/* pause */
printf( "Press enter to exit..." );
getchar();
return 0;
}