我正忙着在Xcode中做一个测试程序。到目前为止,我在main.m中有这个代码。我没有任何错误,但输出没有发生,即打印方法中的NSLog。
可能是什么问题?我知道我必须遗漏一些明显的东西。
#import <UIKit/UIKit.h>
#import "JTAppDelegate.h"
@interface Fraction: NSObject
-(void) print;
-(void) setNumerator: (int) n;
-(void) setDenominator: (int) d;
@end
@implementation Fraction
{
int numerator;
int denominator;
}
-(void) print
{
NSLog (@"%i/%i", numerator, denominator);
}
-(void) setNumerator:(int)n
{
numerator = n;
}
-(void) setDenominator:(int)d
{
denominator = d;
}
@end
int main (int argc, char * argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([JTAppDelegate class]));
// Create an instance of Fraction and initialise it
Fraction *myFraction = [[Fraction alloc] init];
//Set Fraction to 1/3
[myFraction setNumerator: 1];
[myFraction setDenominator: 3];
//Display the fraction using the print method
[myFraction print];
}
}
答案 0 :(得分:4)
print
位于return
之后,此代码永远不会到达。
答案 1 :(得分:2)
写回车和返回声明上面的所有代码。
答案 2 :(得分:0)
替换它: -
int main (int argc, char * argv[])
{
@autoreleasepool {
// Create an instance of Fraction and initialise it
Fraction *myFraction = [[Fraction alloc] init];
//Set Fraction to 1/3
[myFraction setNumerator: 1];
[myFraction setDenominator: 3];
//Display the fraction using the print method
[myFraction print];
return UIApplicationMain(argc, argv, nil, NSStringFromClass([JTAppDelegate class]));
}
}