Formula To have 2D array index Definite To Replace The Value Inside the Array (Tic-Tac-Toe) in C-CodePudding

So I am writing a game of Tic-tac-toe for 2 player in C but I don't know what formula to input so when I print the array a second time the The 'X' or the 'O' replaced the Number that were there before here is the program :

 #include <stdio.h>

void main(){

char plateau[3][3]={
    {'1','2','3'},
    {'4','5','6'},
    {'7','8','9'}
};
int t=0;
char choix1;
char choix2;
int i , j , k;

printf("-------------------------------------------------------------------\n");

for(t=0;t<9;t  ){
    if(t%2==0){
        for(int i=0;i<3;i  ){
        for(int j=0;j<3;j  ){
            printf(" %c ",plateau[i][j] );
            }
            printf("\n");
        }
            
            printf("Turn > Player n1 what case do you want to play?");
            scanf(" %c",&choix1);
            printf("\n");
            int i=;
            int j=;
            plateau[i][j]='X';
        }
    
    if(t%2!=0){
            for(int i=0;i<3;i  ){
            for(int j=0;j<3;j  ){
                printf(" %c ",plateau[i][j] );
                }
            printf("\n");
        }
        printf("\nTurn > Player n2 what case do you want to play?");
        scanf(" %c",&choix2);
        printf("\n");
        }
}

}

so this

 int i=;
                int j=;
                plateau[i][j]='X';
            }

Like i need a formula that for int i if choix1 is {1||2||3} then i would be 0 , if choix1 is {4||5||6} then it would be 1 . Same thing with j .

Here is like what it should look like (mind that i predetermined where X was gonne be it is not from the input) :

  1  2  3
 4  5  6
 7  8  9
Turn > Player n1 what case do you want to play?1

 1  2  3
 4  5  6
 X  8  9

Turn > Player n2 what case do you want to play?^C

I tried to do it with if statement but with no success here is my attempt:

printf("Turn > Player n1 what case do you want to play?");
            scanf(" %c",&choix1);
            printf("\n");

            if(choix1 ==1||choix1==2||choix1==3){
            int i=0;}

            if(choix1 ==4||choix1==5|choix1==6){
            int i=1;}

            if(choix1 ==7||choix1==8||choix1==9){
            int i=2;}

            if(choix1 ==1||choix1==4||choix1==7){
            int j=0;}

            if(choix1 ==2||choix1==5|choix1==8){
            int j=1;}

            if(choix1 ==3||choix1==6||choix1==9){
            int j=2;}

            plateau[i][j]='X';
        }

If someone could help me or oriented me in a way to find answer it will be gladly appreciated.

CodePudding user response：

Your attempt is pretty close to working Your main problem is that you are writing int extra times.

When you write int i=0;, that is a definition of a new variable named i that will only be visible inside the block where it was defined.

If you want to change the value of an existing variable (also called "assigning" a value to the variable), just do this:

i = 0;

Also, I highly recommend cleaning up your indentation and whitespace.

After you take this advice, your code would look something like:

int i = 0, j = 0;

if (choix1 == 1 || choix1 == 2 || choix1 == 3) {
  i = 0;
}
...
plateau[i][j] = 'X';

Your big list of if statements should work fine. But if you want help simplifying it after you get it working, you could ask on Code Review.