ios测试宏指令出错：“Expected identefier”

Question

写了一个简单的测试宏指令，然后在下面代码中报错，不知道怎么修复？谢谢

#define test(condition) do{\
    if (condition)
    {\        //// <-----Expected identifier or (
        NSlog @"passed: " %@ #condtion); \

    }
    else
    {\
        NSLog(@"failed: " @ #condition); \

    }
}   //// <-----extraneous closing brace ( "}")

Answer 1

简单方法:

#define test(condition) NSLog("%s: %s\n", condition ? "Passed" : "Failed", #condition);

调用：

int i = 6;
test(i > 8);
test(i < 8);

输出：

Failed: i > 8
Passed: i < 8

Answer 2

你应该在每行宏指令的末尾加一个反斜杠，最后一个不用加

#define test(condition) do{\
    if (condition) \
    {\
        NSlog @"passed: " %@ #condtion); \
    } \
    else \
    { \
        NSLog(@"failed: " @ #condition); \
    } \
}