請查看這段代碼,更具體地說是hourStep計算。在objective-c中的計算沒有返回正確的值
int h = [[timeArray objectAtIndex:0] intValue];
int m = [[timeArray objectAtIndex:1] intValue];
int s = [[timeArray objectAtIndex:2] intValue];
int mm = [[timeArray objectAtIndex:3] intValue];
NSLog([NSString stringWithFormat:@"time h:%d, m:%d, s:%d, mm:%d", h, m, s, mm]);
//time h:13, m:7, s:55, mm:105
float hourStep1 = m/60;
float hourStep2 = h + hourStep1;
float hourStep3 = hourStep2/24;
float hourStep4 = hourStep3 * 15;
int hour1 = ceil(hourStep4);
NSLog([NSString stringWithFormat:@"hourStep1: %f, hourStep2: %f, hourStep3: %f, hourStep4: %f result: %d", hourStep1, hourStep2, hourStep3, hourStep4, hour1]);
//hourStep1: 0.000000, hourStep2: 13.000000, hourStep3: 0.541667, hourStep4: 8.125000 result: 9
float hourStep5 = ((h + (m/60))/24) * 15;
NSLog([NSString stringWithFormat:@"hourStep5: %f", hourStep5]);
//hourStep5: 0.000000
我已經計算分解成各個步驟,以得到正確的答案,但任何人都可以解釋爲什麼hourStep5不會產生什麼hourStep4產生?
這不會產生相同的結果在上面的計算,因爲原來的海報使用`米/ 60`那裏,太(情願或不小心,我不知道)。爲了模擬第一次計算,使用`(h +(m/60))/ 24.0`。 – 2011-01-25 13:24:28