Easy Snake

//Easy Snake! Why is it easy? Because you have to hit enter to move the snake!
//TRY ME
//
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <iomanip>
using namespace std;

const int ROWLENGTH=28, SELECTIONS=1, EsL=17; //EASYSNAKE_BOX_SIDE_LENGTH must be odd
struct twoints {int x; int y;} coords[EsL*EsL];


int display_menu(), display_menu_input(), movesnake(int& currentcoordinate), counter=-1;
void objective(), easysnake(), header(), cls(), easysnakeheader(), easysnakestartscreen(), easysnakedirections(), easysnake_start_coordinates(), printeasysnake();


int main()
{
    srand (time(NULL));
    do
    {
        int subprogram=display_menu();
        switch(subprogram)
        {
        case 1:
            easysnake();
            break;
        }
        cls();
    } while(1);
    return 0;
}

void easysnake()
{
    cls();
    for (int its=0;its<EsL*EsL;its++)
    {
        coords[its].x=0;
        coords[its].y=0;
    }
    easysnakestartscreen();
    easysnake_start_coordinates();
    int currentcoordinate=static_cast<int>((EsL*EsL)/2)+1;
    do
    {
        objective();
        printeasysnake();
        int quit=movesnake(currentcoordinate);
        if (quit==1)
            break;
    }while(1);
    counter=0;
    return;
}

int movesnake(int &currentcoordinate)
{
    char wasd;
    int tempcoord;
    tempcoord=currentcoordinate;
    coords[currentcoordinate].x=0;
    int validity;
    do
    {
        cin >> wasd;
        if (wasd=='0')
            return 1;
        if (wasd=='a' || wasd == 'A')
        {
            if (tempcoord%EsL==0)
                return 1;
            currentcoordinate=tempcoord-1;
            coords[currentcoordinate].x=1;
            if (coords[currentcoordinate].y>0)
                return 1;
            coords[currentcoordinate].y=counter+2;
            validity=0;
            if (currentcoordinate<0)
                return 1;

        }
        else if (wasd=='d' || wasd == 'D')
        {
            currentcoordinate=tempcoord+1;
            coords[currentcoordinate].x=1;
            if (coords[currentcoordinate].y>0)
                return 1;
            coords[currentcoordinate].y=counter+2;
            validity=0;
            if (currentcoordinate>289)
                return 1;
            if (currentcoordinate%EsL==0)
                return 1;
        }
        else if (wasd=='w' || wasd == 'W')
        {
            if (tempcoord<17)
                return 1;
            currentcoordinate=tempcoord-EsL;
            coords[currentcoordinate].x=1;
            if (coords[currentcoordinate].y>0)
                return 1;
            coords[currentcoordinate].y=counter+2;
            validity=0;
        }
        else if (wasd=='s' || wasd == 'S')
        {
            currentcoordinate=tempcoord+EsL;
            coords[currentcoordinate].x=1;
            if (coords[currentcoordinate].y>0)
                return 1;
            coords[currentcoordinate].y=counter+2;
            validity=0;
            if (currentcoordinate>289)
                return 1;
        }
        else if (wasd=='0')
            return 1;
        else
        {
            cout << "Invalid input. Enter w, a, s or d. Enter 0 to quit.\n";
            validity=1;
        }
    }while(validity!=0);
    for (int its=0; its<=EsL*EsL; its++)
        if (coords[its].y>0)
            coords[its].y--;
    cls();

}
void objective()
{
    for (int its=0; its<EsL*EsL;its++)
        if (coords[its].x==2)
            return;
    int randomint=1;
    do
    {
        randomint=rand()%(EsL*EsL);
        if (coords[randomint].x==1)
            randomint=1;
    }while(randomint==1);
    coords[randomint].x=2;
    counter++;
    return;
}

void printeasysnake()
{
    easysnakeheader();
    char ch=254;
    cout << ch;
    for (int its=1; its<=EsL*EsL;its++)
    {
        if (coords[its-1].y>=1&&!(coords[its-1].x==1))
            cout << "o";
        if (!(coords[its-1].x)&&coords[its-1].y==0)
            cout << " ";
        else if (coords[its-1].x==1)
            cout << "0";
        else if (coords[its-1].x==2)
            cout << "*";
        if (its==EsL*EsL)
            cout << ch << endl;
        else if (its==EsL)
        {
            cout << ch;
            if (counter>=1)
                cout << " P";
            cout << "\t[ *\'s eaten: ]"<< endl << ch;
        }

        else if (its==EsL*2)
        {
            cout << ch;
            if (counter>=2)
                cout << " R";
            cout <<"\t[" << setw(8) << counter << "    ]" << endl << ch;
        }
        else if (its==EsL*3)
        {
            cout << ch ;
            if (counter >=3)
                cout << " O";
            cout << endl << ch;
        }
        else if (its==EsL*4)
            {
            cout << ch ;
            if (counter >=4)
                cout << " G";
            cout << endl << ch;
        }
        else if (its==EsL*5)
            {
            cout << ch ;
            if (counter >=5)
                cout << " R";
            cout << endl << ch;
        }
        else if (its==EsL*6)
            {
            cout << ch ;
            if (counter >=6)
                cout << " A";
            cout << endl << ch;
        }
        else if (its==EsL*7)
            {
            cout << ch ;
            if (counter >=7)
                cout << " M";
            cout << endl << ch;
        }
        else if (its==EsL*8)
            {
            cout << ch ;
            if (counter >=8)
                cout << " M";
            cout << endl << ch;
        }
        else if (its==EsL*9)
            {
            cout << ch ;
            if (counter >=9)
                cout << " I";
            cout << endl << ch;
        }
        else if (its==EsL*10)
            {
            cout << ch ;
            if (counter >=10)
                cout << " N";
            cout << endl << ch;
        }
        else if (its==EsL*11)
            {
            cout << ch ;
            if (counter >=11)
                cout << " G";
            cout << endl << ch;
        }
        else if (its==EsL*12)
            {
            cout << ch ;
            if (counter >=12)
                cout << "  ";
            cout << endl << ch;
        }
        else if (its==EsL*13)
            {
            cout << ch ;
            if (counter >=13)
                cout << " I";
            cout << endl << ch;
        }
        else if (its==EsL*14)
            {
            cout << ch ;
            if (counter >=14)
                cout << " N";
            cout << endl << ch;
        }
        else if (its==EsL*15)
            cout << ch << endl << ch;
        else if (its==EsL*16)
            {
            cout << ch ;
            if (counter >=16)
                cout << " C++";
            cout << endl << ch;
        }
        else if (its==EsL*17)
            cout << ch << endl << ch;
        else if (its%EsL==0 && its!=0)
            cout << ch << endl << ch;
    }
    easysnakeheader();
}

void easysnake_start_coordinates()
{
    coords[static_cast<int>((EsL*EsL)/2)+1].x=1;
    coords[static_cast<int>((EsL*EsL)/2)+1].y=1;
}

void easysnakedirections()
{
    cout << "You control the snake. \nUse WASD to control the snake.\nGuide the snake to the objectives!\nEnter 0 to quit.\n";
}
void easysnakestartscreen()
{
    easysnakedirections();
    easysnakeheader();
    for (int iterations=0; iterations<EsL;iterations++)
    {
        char ch=254;
        cout << ch;
        for (int iterations=0; iterations<EsL;iterations++)
            {
                cout << " ";
            }
        cout << ch << endl;
    }
    easysnakeheader();
    char pause;
        cout << "Enter any key to continue\n";
        cin >> pause;
}

void easysnakeheader()
{
    char ch=254;
    for (int iterations=0;iterations<EsL+2; iterations++)
        cout << ch;
    cout << endl;
}

void cls()
{
    for (int iterations=0;iterations<=20;iterations++)
        cout << endl;
}
int display_menu()
{
    header();
    cout << "Enter a menu choice.\n";
    cout << "\t1: Joe's Easy Snake\n";
    cout << "\t" << SELECTIONS+1 <<": EXIT\n";
    header();
    int selection=display_menu_input();
    return selection;
}

int display_menu_input()
{
    char input;
    int inputasint;
    cin >> input;
    inputasint=input;
    while (inputasint<49 || inputasint>49+SELECTIONS)
    {
        cout << "Bad input; enter between 1 and " << SELECTIONS+1 << endl;
        cin >> input;
        inputasint=input;
    }
    if (inputasint==49+SELECTIONS)
        exit (EXIT_SUCCESS);
    return inputasint-48;
}int validity;

void header()
{
    for (int iterations=0; iterations<ROWLENGTH; iterations++)
        cout << "=";
    cout << endl;
}