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 ( "}")

2个回答

 

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); \    } \}

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 > 8Passed: i < 8 转；