c - 为什么我的变量在编译时报告为 "undeclared identifier"？

Question

我有以下代码:

       for(int iY=0;iY<(Height-YRemainder);iY=iY+16);
        {
            for(int iX=0;iX<(Width-XRemainder);iX=iX+16);
            {
                if(Operation==BLACKNESS)
                {
                    Operation = WHITENESS;
                    PatBlt(DeviceContext, iX, iY, 16, 16, Operation);
                }
                else
                {
                    Operation = BLACKNESS;
                    PatBlt(DeviceContext, iX, iY, 16, 16, Operation);
                }
            }
            if(Operation == BLACKNESS)
            {
                Operation = WHITENESS;
                PatBlt(DeviceContext, Width-XRemainder,iY,16,16,Operation);
            }
            else
            {
                Operation = BLACKNESS;
                PatBlt(DeviceContext, Width-XRemainder, iY, 16, 16, Operation);
            }


        }

编译时，我得到针对 iX 和 iY 的每个 PatBlt 报告的未声明标识符。我是否误解了每个变量的作用范围，或者我错过了什么？

提前致谢

Answer 1

for 语句末尾有分号，可将它们转换为单行语句:

for(int iY=0;iY<(Height-YRemainder);iY=iY+16);

变成

for(int iY=0;iY<(Height-YRemainder);iY=iY+16)