gcc在基本示例objc程序中编译错误
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大家好，我是编程的新手，正在学习一本Objective-C书籍，以学习语言和编程基础知识。我反复浏览了一下代码，回到了本书的示例中，尝试理解gcc comple错误。这是我的代码：
#import <stdio.h>
#import <objc/Object.h>
@interface Point: Object
{
int xaxis;
int yaxis;
}
-(void) print;
-(void) setx: (int)x;
-(void) sety: (int)y;
@end
@implementation Point;
-(void) print
{
printf(\"(%i,%i)\", xaxis, yaxis);
}
-(void) setx: (int) x
{
xaxis = x;
}
-(void) sety: (int) y
{
yaxis = y;
}
@end
int main (int argc, char *argv[])
{
Point *myPoint;
myPoint = [Point alloc];
myPoint = [myPoint init];
[myPoint setx: 4];
[myPoint sety: 5];
printf(\"The coordinates are: \");
[myPoint print];
printf(\"\\n\");
[myPoint free];
return 0;
}
urban:Desktop alex$ gcc point.m -o point -l objc
point.m: In function ‘main’:
point.m:38: warning: ‘Point’ may not respond to ‘+alloc’
point.m:38: warning: (Messages without a matching method signature
point.m:38: warning: will be assumed to return ‘id’ and accept
point.m:38: warning: ‘...’ as arguments.)
point.m:40: error: ‘mypoint’ undeclared (first use in this function)
point.m:40: error: (Each undeclared identifier is reported only once
point.m:40: error: for each function it appears in.)
point.m:49: warning: ‘Point’ may not respond to ‘-free’
没有找到相关结果
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3 个回复
缔恃钨
没有实现，或。通常，在Apple平台上，您会创建子类，该子类确实实现了这些，但是在不知道您所使用的平台上，无法建议正确的选择。 其次，您有错别字，但现在似乎已得到纠正。这个建议您的代码中包含，而不是。号拳藐孔妇
-(id)init { if ( ( self = [super init] ) ) { ; // additional initialization goes here } return self; }int main (int argc, char *argv[]) { Point *myPoint = [[Point alloc] init];@interface Point: Object { int xaxis; int yaxis; }@interface Point : NSObject { } @property int xaxis; @property int yaxis;要么释放对象时，写释放，不是免费的hth邪罗逢确胃