C++ Please fix some problems with my Tic Tac Toe Program: a. It should declare the winner. Like "Congratulations! Player X has won the game!" b.  A box is already chosen by a player, but if you repeat the location, it changes instead of displaying that it's already occupied. c. Supply the algorithm needed for a Draw/Tie. CODE:  #include

C++

Please fix some problems with my Tic Tac Toe Program:

a. It should declare the winner. Like "Congratulations! Player X has won the game!"

b.  A box is already chosen by a player, but if you repeat the location, it changes instead of displaying that it's already occupied.

c. Supply the algorithm needed for a Draw/Tie.

CODE: 

#include <stdio.h>
#include <ctype.h>

//global var declaration
char brd[3][3]={{'*','*','*'},
{'*','*','*'},
{'*','*','*'}};
dispbrd(){
//local var declaration
int r,c;
for(r=0;r<3;r++){
for(c=0;c<3;c++)
printf("\t%c",brd[r][c]);
printf("\n");
}
}

char switchplyr(char plyr){
if(plyr=='X')
plyr = 'O';
else
plyr = 'X';
return plyr;

}

main(){
//local var declaration
char plyr;
int row,col,win=0;

printf("\n\n\n");
printf(" TIC TAC TOE");
printf("\n\n\n");

dispbrd();

printf("\nWho plays first<X/O>? ");
fflush(stdin);
scanf("%c",&plyr);
plyr = toupper(plyr);


do{
printf("\nPlayer %c, please select your location<row,col>: ",plyr);
fflush(stdin);
scanf("%d,%d",&row,&col);
brd[row][col]=plyr;
dispbrd();
//test for winning pattern
if(brd[0][0]==plyr&&brd[0][1]==plyr&&brd[0][2]==plyr) win=1; //pattern 1
if(brd[1][0]==plyr&&brd[1][1]==plyr&&brd[1][2]==plyr) win=1; //pattern 2
if(brd[2][0]==plyr&&brd[2][1]==plyr&&brd[2][2]==plyr) win=1; //pattern 3
if(brd[0][0]==plyr&&brd[1][0]==plyr&&brd[2][0]==plyr) win=1; //pattern 4
if(brd[0][1]==plyr&&brd[1][1]==plyr&&brd[2][1]==plyr) win=1; //pattern 5
if(brd[0][2]==plyr&&brd[1][2]==plyr&&brd[2][2]==plyr) win=1; //pattern 6
if(brd[0][0]==plyr&&brd[1][1]==plyr&&brd[2][2]==plyr) win=1; //pattern 7
if(brd[0][2]==plyr&&brd[1][1]==plyr&&brd[2][0]==plyr) win=1; //pattern 8

plyr = switchplyr(plyr);
printf("player: %c",plyr);
}while(win!=1);
printf("\nCongratulations, you win!!");




}