C API、lua_concat()

everyday Lua 
/*
 * $ gcc -Wall -W -I/usr/include/lua50 -o 2008102500 -llua50 2008102500.c
 */

#include <stdio.h>
#include <lua.h>

int main(void) {
  lua_State *L;

  L = lua_open();

  lua_pushstring(L, "foo");
  lua_pushstring(L, " bar");
  lua_pushstring(L, " baz");

  lua_concat(L, 3);
  printf("%s\n", lua_tostring(L, -1));

  lua_concat(L, 0);
  printf("*%s*\n", lua_tostring(L, -1));

  lua_close(L);

  return 0;
}

で、

foo bar baz
**