Timer in my C++ maze

Hello, I made a very simple puzzle game,(its not yet finished) but i want to add a timer as soon as the game starts up.....I managed to do it BUT i cant put it beside my Maze...can you help me with my problem?..any help would be much appreciated....
The Timer is in the Function "timer()"

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  #include <iostream>
#include "windows.h"
int movement();
void instruction();
int timer();
using namespace std;



char map[24][80] = { //2                //4

    "##############################################################################",
    "#@                       #                                                   #",
    "# #### ###  #### #########   ############        ########################    #",
    "# # ## # # # #    #                     #        #                      #    #",
    "#    #     # # #### ####  # # ####### # #        # #################### #    #",
    "# # #  # # # #    # #  #  ### #       # #        # #                  # #    #",
    "# #### ### ### #  # #  #      #       # #        # #                  # #    #",
    "#    #            # ##########        # ########## #                  # #    #",
    "# #### ### ### # ##          #        #            #   ################ #    #",
    "# #  # # #   # #  ########## #        ##############   #                #    #",
    "# #  # ##  #   ##          # #                         #  ###############    #",
    "#    # ####### #   ######### #                         #  #                  #",
    "# #  #      #    ##          #                         #  #                  #",
    "# #  ###### ####  # ##########                         #  #                  #",
    "# #       #      ## #                                  #  #                  #",
    "# # # ##### ####  # #            #######################  #                  #",
    "# # #       #     # #            #                        #                  #",
    "# # # # ########### #            # #############################             #",
    "# ### #             #            #                                       ## ##",
    "#     ###############              #################################     # F #",
    "##############################################################################"
};

int x=1;
int y=1;

bool game_running = true;




int main()
{
char ch;
    //intro:
    cout << "      ================================================"<<endl;
    cout << "     / ##     ##     ##    #############     ######## /"<<endl;
    cout << "    / # #   # #    #  #              ##     #        /"<<endl;;
    cout << "   / #  # #  #   #    #           ##       #######  /"<<endl;;
    cout << "  / #   #   #  ########        ##         #        /"<<endl;;
    cout << " / #       # #        #     ##           #        /"<<endl;;
    cout << "/ #       ##          #  ############   ######## /"<<endl;
    cout << "================================================/"<<endl;
    cout <<"" <<endl;
    cout <<"" <<endl;
    cout <<"" <<endl;
    cout <<"" <<endl;
    cout <<"a. Start Game" <<endl;
    cout <<"b. Instructions" <<endl;
    cout <<"c. Exit Game" <<endl;

    cin  >>ch;

    switch(ch)
    {
    case 'a':
        movement();
        break;
    case 'b':
        instruction();
        break;
    case 'c':
        system("cls");
        cout << "Thank You For Playing/t";
        break;
    }

}

int movement(){


while(game_running == true){



        system("cls");
        for(int display=0; display<24; display++){


            cout << map[display] << endl;



}

        system("pause>nul");

        if(GetAsyncKeyState(VK_DOWN)){
            int y2 = y+1;
            if(map[y2][x] == ' '){
                map[y][x] = ' ';
                y++;
                map[y][x] = '@';
            }
        }

        if(GetAsyncKeyState(VK_UP)){
            int y2 = y-1;
            if(map[y2][x] == ' '){
                map[y][x] = ' ';
                y--;
                map[y][x] = '@';
            }
        }

        if(GetAsyncKeyState(VK_RIGHT)){
            int x2 = x+1;
            if(map[y][x2] == ' '){
                map[y][x] = ' ';
                x++;
                map[y][x] = '@';
            }
        }

        if(GetAsyncKeyState(VK_LEFT)){
            int x2 = x-1;
            if(map[y][x2] == ' '){
                map[y][x] = ' ';
                x--;
                map[y][x] = '@';
            }
        }

        if(GetAsyncKeyState(VK_ESCAPE)){
            game_running = false;
        }
    }
    system("cls");
    cout << "GAME OVER";

    return 0;


}

void instruction(){
char cho;
system("cls");
cout <<"INSTRUCTIONS:" <<endl;
cout << "Go to the Finish as fast as possible" <<endl;
cout << " "<< endl;
cout << " "<< endl;

cout << "CONTROLS: "<< endl;
cout << "ArrowUp -Move Up "<< endl ;
cout << "ArrowDown - Move Down"<< endl ;
cout << "ArrowLeft- Move Left"<< endl ;
cout << "ArrowRight- Move Right"<< endl ;
cout << " "<< endl;
cout << " "<< endl;
cout << " "<< endl;


cout <<"Press 'A' to go back"<<endl;
cin >> cho;
switch (cho)
{
    case 'a':
    system("cls");
    main();
}


}
int timer(){ //Timer for the Maze

int milliseconds = 0;
int seconds = 0;
int minutes = 0;
int hours = 0;



 for(;;){

            if (milliseconds == 10){
                ++seconds;
                milliseconds = 0;
            }
            if (seconds == 60){
                ++minutes;
                seconds = 0;
            }
            if(minutes == 60){

                ++hours;
                minutes=0;
            }


         cout <<hours;
         cout <<":";
         cout<<minutes;
         cout<<":" ;
         cout<<seconds;
         cout<<"." ;
         cout<<milliseconds <<endl;
system("cls");
        ++milliseconds;
         Sleep(100);


 }

return 0;

 }



I would really strongly suggest getting a game programming library to do something like this. Then you can have multiple threads running at once and be for example, checking for user input, checking if maze position needs to be redrawn and displaying and changing a timer all at once.

Some libraries suitable for game programming are:
http://www.sfml-dev.org/
http://alleg.sourceforge.net/

This will also mean you're not restricted to ascii/unicode for you next game(s) as you will be able to have images and animation.
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