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
", condition ? "Passed" : "Failed", #condition);
调用:
int i = 6;
test(i > 8);
test(i < 8);
输出:
Failed: i > 8
Passed: i < 8
转;http://ask.csdn.net/questions/1090