所以我參加了一個Xcode Objective-C課程,我們必須製作一個計算器。除了我必須創建一個例外情況的部分,除非有人試圖用零來除。我不能爲了我的生活得到它的工作,我一直得到的是我的計算器上的INF消息。他們也希望它是一個@try @catch
方法,所以我的Google搜索引導我自己問這個問題,因爲我找不到答案。這是我的完整代碼。除以零異常 - Objective-C
#import "Calculator.h"
@interface ViewController()
@end
@implementation ViewController
@synthesize numerator, denominator, total, operand, theNumber, lblText;
- (void)viewDidLoad {
[super viewDidLoad];
[self setNumerator:0];
[self setDenominator:0];
[self setOperand:PLUS];
[self setTotal:0.0];
[self setTheNumber:@""];
[self printNumber];
}
-(void)printNumber
{
[lblText setText:theNumber];
}
-(float)divideOp
{
float result=0;
@try {
if (self.denominator != 0) {
result = (self.numerator/self.denominator);
} else {
result = NAN;
}
} @catch (NSException *exception) {
// deal with the exception
NSLog(@"Can't divide by 0!");
}
return result;
}
-(IBAction)calculate:(id)sender
{
denominator = [theNumber integerValue];
if(operand == PLUS)
total = numerator + denominator;
else if(operand == MINUS)
total = numerator - denominator;
else if(operand == MULTIPLY)
total = numerator * denominator;
theNumber = [NSString stringWithFormat:@"%f",total];
[self printNumber];
numerator = 0;
denominator = 0;
total = 0.0;
}
-(void)saveNumerator
{
numerator = [theNumber integerValue];
theNumber = @"0";
[self printNumber];
}
-(IBAction)clearNum:(id)sender
{
theNumber = @"0";
[self printNumber];
}
-(IBAction)setPlus:(id)sender
{
[self saveNumerator];
operand = PLUS;
}
-(IBAction)setMinus:(id)sender
{
[self saveNumerator];
operand = MINUS;
}
-(IBAction)setMultiply:(id)sender
{
[self saveNumerator];
operand = MULTIPLY;
}
-(IBAction)setDivide:(id)sender
{
[self saveNumerator];
operand = DIVIDE;
}
-(IBAction)press9:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"9"];
[self printNumber];
}
-(IBAction)press8:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"8"];
[self printNumber];
}
-(IBAction)press7:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"7"];
[self printNumber];
}
-(IBAction)press6:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"6"];
[self printNumber];
}
-(IBAction)press5:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"5"];
[self printNumber];
}
-(IBAction)press4:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"4"];
[self printNumber];
}
-(IBAction)press3:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"3"];
[self printNumber];
}
-(IBAction)press2:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"2"];
[self printNumber];
}
-(IBAction)press1:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"1"];
[self printNumber];
}
-(IBAction)press0:(id)sender
{
theNumber = [theNumber stringByAppendingString:@"0"];
[self printNumber];
}
@end
請只發表相關的代碼。你發佈的大部分代碼與你的問題無關。 – rmaddy
根據你對'@ synthesize'的非常過時的使用來判斷,我希望你能找到更多最新的教程。 – rmaddy