Can anyone explain the function bool check to me and how its working? Im just really confused trying to understand it in context with the program.
Code:
#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;
void display();
bool check(int a, int b);
int drop(int b, char player);
char place[6][7]; //available for whole program
int main()
{
// put white spaces
for(int a =0; a <= 5; a++){
for(int b = 0; b <= 6; b++)
place[a][b] = ' ';
}
display();//Displays empty board
int hold;//user row choice
int hold2 = 0;//drop value
int charsPlaced = 0;//Number of peices dropped so can end game if a draw
bool gamewon = false;//Will be changed to true when game is won and will exit while loop
char player = 'B';//start as player 2 will change back 2 player 1
while(!gamewon){//will stop when game is won, ! means NOT makes the oppisite be checked
if(hold2 != -1){//check if there was a error in the last drop
if(player == 'B'){//if player 2 lasted dropped a piece so its player 1s turn
cout<<"player 1 drop where?";
player = 'A';//char of players piece
}
else{
cout<<"player 2 drop where?";
player = 'B';//char of player piece
}
}
while(true){//will run untill 'break;'
if(charsPlaced == 42) break;//if draw
cin>>hold;//get user input
hold--;//take off 1 to account for arrays starting at 0 not 1
if(hold <=6 && hold>= 0) break;//if within valid range stop loop
else cout<< "\nplease enter a value between 1 and 7 :";//ask for input and loop again
if (cin.fail()) //catch a non number
{ //
cin.clear(); //Stops cin trying to put its value in to hold
char c; //Try entering a non number without this, 2 see what this does
cin>>c; //
} //Catch a non number
}
if(charsPlaced == 42) break;//if draw
hold2 = drop(hold,player);//drop the player store the row in hold2
if(hold2 == -1) cout<<"Colom is full\nPlease enter anothor number between 1 and 7:";//if error -1 row is full
else{
gamewon = check(hold2,hold);//check if game is run
charsPlaced ++;//another character has been succesfully placed
system("cls");//This clears the screen works with windows, not nesscery to run game
display();//displayed updated board
}
}
system("cls");//this clears the screen
if(charsPlaced == 42){//if draw
cout<<"No winner, Game was draw\n";
system("pause");
return 0;
}
if(player == 15)//if won by player 2
cout<<"gamewon by : player 2\n";
else cout<<"gamewon by : player 1\n";//Else won by player 1
system("pause");//pauses before exit so players can see who won, works with windows
return 0;//Exit application
}
void display()
{
cout<<" 1 2 3 4 5 6 7\n";
for(int a = 0; a <= 5; a++)
{
for(int b =0; b <= 6; b++) cout<<"-"<<"-"<<"-"<<"-";
cout<<'\n';
for(int b =0; b <= 6; b++) cout<<"|"<<place[a][b]<<" "<<"|";
cout<<'\n';
for(int b =0; b <= 6; b++) cout<<"-"<<"-"<<"-"<<"-";
cout<<'\n';
}
}
bool check(int a, int b)
{
int vertical = 1;//(|)
int horizontal = 1;//(-)
int diagonal1 = 1;//(\)
int diagonal2 = 1;//(/)
char player = place[a][b];
int i;//vertical
int ii;//horizontal
//check for vertical(|)
for(i = a +1;place[i][b] == player && i <= 5;i++,vertical++);//Check down
for(i = a -1;place[i][b] == player && i >= 0;i--,vertical++);//Check up
if(vertical >= 4)return true;
//check for horizontal(-)
for(ii = b -1;place[a][ii] == player && ii >= 0;ii--,horizontal++);//Check left
for(ii = b +1;place[a][ii] == player && ii <= 6;ii++,horizontal++);//Check right
if(horizontal >= 4) return true;
//check for diagonal 1 (\)
for(i = a -1, ii= b -1;place[i][ii] == player && i>=0 && ii >=0; diagonal1 ++, i --, ii --);//up and left
for(i = a +1, ii = b+1;place[i][ii] == player && i<=5 && ii <=6;diagonal1 ++, i ++, ii ++);//down and right
if(diagonal1 >= 4) return true;
//check for diagonal 2(/)
for(i = a -1, ii= b +1;place[i][ii] == player && i>=0 && ii <= 6; diagonal2 ++, i --, ii ++);//up and right
for(i = a +1, ii= b -1;place[i][ii] == player && i<=5 && ii >=0; diagonal2 ++, i ++, ii --);//up and left
if(diagonal2 >= 4) return true;
return false;
}
int drop(int b, char player)
{
if(b >=0 && b<= 6)
{
if(place[0][b] == ' '){
int i;
for(i = 0;place[i][b] == ' ';i++)
if(i == 5){place[i][b] = player;
return i;}
i--;
place[i][b] =player;
return i;
}
else{
return -1;
}
}
else{
return -1;
}
}