Question

error C2143: syntax error : missing ';' before ')'

error C2143: syntax error : missing ';' before '/'

error C2065: 'y' : undeclared identifier

error C2065: 'y' : undeclared identifier

error C2143: syntax error : missing ';' before ')'

error C2143: syntax error : missing ';' before '/'

error C2065: 'x' : undeclared identifier

error C2065: 'x' : undeclared identifier

error C2065: 'x' : undeclared identifier

error C2065: 'y' : undeclared identifier

error C2065: 'x' : undeclared identifier

error C2065: 'y' : undeclared identifier

以下是代码：

for (int y = Scan->RcWindow.bottom - Scan->RcWindow.top) / 4;
        y < ((Scan->RcWindow.bottom - Scan->RcWindow.top) - (Scan->RcWindow.bottom - Scan->RcWindow.top)) / 3.5;
    y++;

for (int x = Scan->RcWindow.right - Scan->RcWindow.left) / 4;
        x < ((Scan->RcWindow.right - Scan->RcWindow.left) - (Scan->RcWindow.right - Scan->RcWindow.right)) / 4;
    x++;

我的意思是扫描窗口而忽略侧面，就像使窗口较小，只扫描中间部分（光标周围的部分）。我不是一个初学者。感谢您将其编辑为代码格式。

Answer 1

您有语法错误，可能是因为缺少括号。目前尚不清楚你的意图，但显然这不是正确的：

for (int y = Scan->RcWindow.bottom - Scan->RcWindow.top) / 4;
    ^                                                  ^

如果将右括号与其对应的左括号匹配，则/ 4;将挂起。也许你想要：

for (int y = (Scan->RcWindow.bottom - Scan->RcWindow.top) / 4;
    y < ((Scan->RcWindow.bottom - Scan->RcWindow.top) -
         (Scan->RcWindow.bottom - Scan->RcWindow.top)) / 3.5;
    y++);

Answer 2

看看这部分：

for (int y = Scan->RcWindow.bottom - Scan->RcWindow.top) / 4;

                                                       ^ // THIS

您正在关闭for并且您将for循环除以4，这是没有意义的。

Answer 3

两个for循环语句似乎不完整。也许它应该是

for (int y = Scan->RcWindow.bottom - Scan->RcWindow.top) / 4;
        y < ((Scan->RcWindow.bottom - Scan->RcWindow.top) - (Scan->RcWindow.bottom - Scan->RcWindow.top)) / 3.5;
        y++);

for (int x = Scan->RcWindow.right - Scan->RcWindow.left) / 4;
        x < ((Scan->RcWindow.right - Scan->RcWindow.left) - (Scan->RcWindow.right - Scan->RcWindow.right)) / 4;
        x++);

为什么只有前y和x未声明？

3 个答案: