我目前有一系列值在0到500000之间的NSNumber对象。它们是随机生成的值,有许多小数位。
如何打印这些值,但将其四舍五入到最接近的1000?例如,32143.8472将四舍五入到32000。为了简单起见,假设我希望它们在NSLog中。。。
例如。
NSLog(@"The number is: %@", WHATGOESHERE??)
我目前有一系列值在0到500000之间的NSNumber对象。它们是随机生成的值,有许多小数位。
如何打印这些值,但将其四舍五入到最接近的1000?例如,32143.8472将四舍五入到32000。为了简单起见,假设我希望它们在NSLog中。。。
例如。
NSLog(@"The number is: %@", WHATGOESHERE??)
NSNumber对象适合存储值,对于数字运算,应使用纯数字类型(例如int)
请尝试以下代码:
int rounded = 1000*(([number intValue]+500)/1000);
那里发生了什么:
[number intValue]
That gets integer part of our number
加500除以1000,得到我们数字中最接近的几千
乘以1000-补偿之前的除法,得到一个实际四舍五入到数千的数字
如果需要,请记录:
NSLog(@"The number is: %d", rounded)
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