C++ Tic-Tac-Toe using switch case

Question

I was trying out a C++ code for the Tic Tac Toe program with help of classes . I am new to coding and would appreciate some help.This is what I have done till now.

#include <iostream>
using namespace std;

int turn=1;
class abc
{
private:
int a[9];
char ch1,ch2;
public:


void accept()
{
    if(turn==1)
     {
     cout<<"\n\nPlayer 1 enter choice : ";
     cin>>ch1;
     turn=2;
     }
    else
    {
     cout<<"\n\nPlayer 2 enter choice :";
     cin>>ch2;
     turn=1;
     }
}

void layout()
{
a[0]=1;
a[1]=2;
a[2]=3;
a[3]=4;
a[4]=5;
a[5]=6;
a[6]=7;
a[7]=8;
a[8]=9;

cout<<"\n\n"<<"-----------"<<" "<<a[0]<<"     "<<a[1]<<"     "<<a[2]<<" -----------";       
cout<<"\n"<<"-----------"<<" "<<a[3]<<"     "<<a[5]<<"     "<<a[6]<<" -----------";
cout<<"\n"<<"-----------"<<" "<<a[6]<<"     "<<a[7]<<"     "<<a[8]<<" -----------";
}

void process ()
{
if (turn==1)
{

switch(ch1)
{
    case 1:     
    a[0]='x';
    break;

}
}
}

/*void check()
{
if(a[0]==a[1] && a[1]=a[2]
}
*/

};

int main()
{
abc def;
cout<<"-----------TIC - TAC - TOE-----------";
def.layout();
do
{
    do
    {
    def.accept();
    def.process();
    def.layout();       
    //def.check();
    }while(turn==2);

    }while(turn==1);

    return 0;
}

So , I can switch from player 1 to player 2 , I intend to use the process function for modifying the layout i.e if the turn 1 player enters 1 then the array should be layout should be modified accordingly . And basically I think I know the logic for the check function i.e a[0]==a[1] && a[1]=a[2] and the other 7 conditions . I just want to know how to use switch case in this condition.

Answer 1

As the comments on your question have implied, your code needs better formatting. However, to answer your question, you could do something along the lines of:

void process() {
    if (turn == 1) {
        a[ch1 - '0'] = 'x'; //char - '0' to convert char to int
    } else {
        a[ch2 = '0'] = 'o';
    }
};

As you can see, you don't really need a switch here. Just use their input to directly access the correct spot in the array.