#include<iostream>
using namespace std;

// Below we are declaring our functions prior to our main.
// This simply allows for our functions to be positioned below 'main'.

int add (int x, int y);
int sub (int x, int y);
int mult(int x, int y);
int divi(int x, int y);

//The start of our 'main' function
int main () {

int x;
int y;
int choice;  //Declaring variables that will allow the user to input the
int sum;     //numbers to manipulate, along with their chosen calculation.

cout<<"Welcome to the SCP (Simple Calculator Program).";
cout<<end1;

do {       //Starting a do-while loop that will allow the user repeated use of the program until
           //they are done.

cout<<"Please enter a 1 to Add, a 2 to Subtract, a 3 to Multiply, or a 4 to divide. Enter 0 to quit";
cin>>choice;   //Inputing the desired calculation

if ( choice == 1 ) {

cout<<"Please enter the numbers that you would like to add.";              //You could use a 'switch' statement
cin>>x;                                                                                            //that would be more efficient, but we
cin>>y;                                                                                           //will demonstrate here how to use the
add(x, y);                                                                                        //control structure 'if' to give the user
cout<<"Your total is: ", sum;                                                             //control of which calculation they would
                                                                                                      //like to perform.
}

if ( choice == 2 ) {

cout<<"Please enter the numbers that you would like to subtract.";
cin>>x;
cin>>y;                                   //'cin' takes the users input, and then 'sub()' passes that input
sub(x, y);                                //to our seperate function that we declared in the begining of the program.
cout<<"Your total is: ", sum;    //Our function returns the calculation, and 'sum' outputs the end result.

}

if ( choice == 3 ) {

cout<<"Please enter the numbers that you would like to multiply.";
cin>>x;
cin>>y;
mult(x, y);
cout<<"Your total is: ", sum;

}

if ( choice == 4 ) {

cout<<"Please enter the numbers that you would like to divide.";
cin>>x;
cin>>y;
divi(x, y);
cout<<"Your total is: ", sum;

}

if ( choice == 0 ) {

cout<<"Thank you for using SCP, Goodbye.";
cin.get();

}

else {
cout<<"You did not select a valid option.";
  }

}while (choice != 0);

}



int add(int x, int y) {                            //Here are our functions that perform the actual
int sum;                                             //calculations. The user input is passed using the
sum = x + y;                                     //function call in the main function. These sub functions recieve
return (sum);                                    //the input using '(int x, int y)' and perform the designated
}                                                     //calculation. They assign the

int sub(int x, int y) {
int sum;
sum = x - y;
return (sum);
}

int multi(int x, int y) {
int sum;
sum = x * y;
return (sum);
}

int divi(int x, int y)  {
int sum;
sum = x / y;
return (sum);
}

#include <stdio.h>
#include <string.h>

/* If using a ANSI C compile, just include the libs
I'm using VS 2005 and compiling from a C++ environment requires extern "C"
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#ifdef __cplusplus
}
#endif

int main()
{
    char buff[256];
    int error;
        lua_State *L = luaL_newstate();            /*open a new lua state*/
    luaL_openlibs(L);                        /*open standard libraries*/

    /* this is an embedded lua interpreter,
            like if you opened the interpreter from the executable directly
       gathers input, crtl + Z exits
     */
    while(fgets(buff, sizeof(buff), stdin) != NULL) {
        error = luaL_loadbuffer(L, buff, strlen(buff), "line") ||
            lua_pcall(L, 0, 0,0 );
        if(error){
            fprintf(stderr, "%s", lua_tostring(L, -1));
            lua_pop(L, 1); /*pop error message from the stack*/
        }
    }

    lua_close(L); /*clean up*/

    return 0;
}

xCursor = 5

#include <cstdio>
#include <cstring>

#ifdef __cplusplus
extern "C" {
#endif
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#ifdef __cplusplus
}
#endif

int main()
{
    lua_State *L = luaL_newstate();            /*open a new lua state*/
    luaL_openlibs(L);                        /*open standard libraries*/

    luaL_dofile(L, "test.lua");    /* open up a lua file in the current directory*/
    lua_getglobal(L, "xCursor"); /* push a global onto the stack*/
    printf("%d\n\n", lua_tointeger(L,lua_gettop(L))); /*retrieve and print*/
    lua_close(L); /*clean up*/
    return 0;
}

function f(x, y)
    return (x^2*math.sin(y))/(1-x)
end

#include <cstdio>
#include <cstring>

#ifdef __cplusplus
extern "C" {
#endif
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#ifdef __cplusplus
}
#endif

int main()
{
    lua_State *L = luaL_newstate();            /*open a new lua state*/
    luaL_openlibs(L);                        /*open standard libraries*/

    /*vars we'll pas to Lua*/
    double x = 5, y = 6, result;

    luaL_dofile(L, "test.lua");    /* open up a lua file in the current directory*/
    lua_getglobal(L, "f"); /* push a global onto the stack*/
    lua_pushnumber(L, x);
    lua_pushnumber(L, y);

    /*2 arguments, 1 result*/
    if(lua_pcall(L, 2, 1, 0) != 0){
        /* if a problem arose, print the error from the top of stack (-1)*/
        luaL_error(L, "error running function 'f': %s", lua_tostring(L, -1));
    }

    /* it succeeded, get value off the stack */
    result = lua_tonumber(L, -1);
    lua_pop(L, 1); /*pop it*/

    printf("\n\nResult: %f\n\n", result);
    lua_close(L); /*clean up*/
    return 0;
}

import org.keplerproject.luajava.LuaObject;
import org.keplerproject.luajava.LuaState;
import org.keplerproject.luajava.LuaStateFactory;

public class LuaJavaTest {

     public static void main(String[] args){
        LuaState L = LuaStateFactory.newLuaState(); //create state
        L.LdoFile("test.lua"); //open external file
        L.getGlobal("xCursor"); //retrieve value
        System.out.println("xCursor's value is:" + L.toInteger(L.getTop())); //pop it off and print
    }
}