我在C中创建了一个简单的tictactoe游戏。但是我在我的main函数中不断出现这个错误,我不知道在我的else语句之前它想要的表达式是什么。该程序的工作原理是我从两个玩家那里获得符号,然后他们开始游戏。
错误:
tictac.c: In function ‘main’:
tictac.c:31: error: expected expression before ‘else’
tictac.c: At top level:
tictac.c:49: warning: conflicting types for ‘print’
tictac.c:30: warning: previous implicit declaration of ‘print’ was here
tictac.c:63: error: conflicting types for ‘check’
tictac.c:63: note: an argument type that has a default promotion can’t match an empty parameter name list declaration
tictac.c:29: error: previous implicit declaration of ‘check’ was here
tictac.c:89: warning: conflicting types for ‘move’
tictac.c:28: warning: previous implicit declaration of ‘move’ was here
代码:
char board[3][3];
int main(void)
{
int first;
char player1, player2;
printf("Player 1: Choose your symbol: \n");
player1 = getchar();
printf("Player 2: Choose your symbol: \n");
player2 = getchar();
int i=0;
int win;
char turn;
while(win == 0)
{
if((i%2) == 0)
turn = player1;
move(player1);
win = check(player1);
print();
else
turn = player2;
move(player2);
i++;
}
if (i == 8)
printf("its a tie");
else
printf("the winner is %c", turn);
return 0;
}
/*printing the board that takes in a placement int*/
void print(void)
{
int r;
printf("\n");
for (r = 0; r < 3; r++){
printf(" %c | %c | %c \n" , board[r][0], board[r][2], board[r][3]);
if (r != 2)
printf("___________\n");
}
printf("\n");
return;
}
/*check to see if someone won*/
int check(char player)
{
int r, c;
for ( r = 0 ; r <3 ; r++)
{
if ((board[r][0] == player) && (board[r][1] == player) && (board[r][2] == player))
return 1;
}
for ( c = 0 ; c <3 ; c++)
{
if ((board[0][c] == player) && (board[1][c] == player) && (board[2][c] == player))
return 1;
}
if((board[0][0] == player) && (board[1][1] == player) && (board[2][2] == player))
return 1;
if((board[0][2] == player) && (board[1][1] == player) && (board[2][0] == player))
return 1;
return 0;
}
void move(char player)
{
int place;
printf("player1, enter placement: \n");
scanf("%d", &place);
if (place == 1)
board[0][0] = player;
else if (place == 2)
board[0][1] = player;
else if (place == 3)
board[0][2] = player;
else if (place == 4)
board[1][0] = player;
else if (place == 5)
board[1][1] = player;
else if (place == 6)
board[1][2] = player;
else if (place == 7)
board[2][0] = player;
else if (place == 8)
board[2][1] = player;
else if (place == 9)
board[2][2] = player;
}
答案 0 :(得分:3)
你有两类问题。
首先,您需要为您的功能制作原型。在#include
的正下方,但在int main(void)
之上,您需要包含其他功能的声明(但不是定义):
void print(void);
int check(char player);
void move(char player);
这是必要的,因为C的设计使得在一次传递中编译它很容易,通过文件。如果编译器在使用之前不知道这些函数,则可能会遇到一些问题。
你的第二个问题是你在一些地方缺少牙箍。在这里,例如:
if((i%2) == 0)
turn = player1;
move(player1);
win = check(player1);
print();
else
turn = player2;
move(player2);
如果if
语句(或for
或while
或其他一些语句)需要在其正文中包含多个语句,则必须使用大括号包围正文:< / p>
if((i%2) == 0)
{
turn = player1;
move(player1);
win = check(player1);
print();
}
else
{
turn = player2;
move(player2);
}
它在其他地方工作的唯一原因,比如:
if (i == 8)
printf("its a tie");
else
printf("the winner is %c", turn);
...只有一个声明:呼叫printf
。多个语句需要括号。
答案 1 :(得分:0)
你在这段代码中有错误
if((i%2) == 0)
turn = player1;
move(player1);
win = check(player1);
print();
else
turn = player2;
move(player2);
i++;
当您在control flow (if,else-if..)
或iteration looping
中撰写多个正文时,您必须使用{}
来定义正文。
您的代码必须
if((i%2) == 0){
turn = player1;
move(player1);
win = check(player1);
print();
}
else{
turn = player2;
move(player2);
}
i++;
必须为print
,check
,move
声明原型函数。否则它将采用默认原型。
答案 2 :(得分:0)
如果if / else之后只有一行,则只能省略花括号。你的错误在这里:
if((i%2) == 0)
turn = player1;
move(player1);
win = check(player1);
print();
else
turn = player2;
move(player2);
你需要花括号。也只是一个提示,在底部而不是9 if语句,你可以做这样的事情:
board[(place-1)/3][(place+2) % 3] = player;
,这应该等同于你的move()函数中的9个if语句。