[摘要]本文是對關於四捨五入的講解，對學習IOS蘋果軟件開發有所幫助,與大家分享。

1.只捨不如，保留小數點後兩位

NSString *leavemoney = @"4661998.08";

NSString *restinterest = @"44818.1283";

NSString *totalmoney = @"16808934.4083";

NSString *money = @"38675";

double leavemoneyDouble = [leavemoney doubleValue];

double restinterestDouble = [restinterest doubleValue];

double totalmoneyDouble = [totalmoney doubleValue];

double moneyDouble = [money doubleValue];

NSLog(@"%.2f", floor(leavemoneyDouble*100)/100);

NSLog(@"%.2f", floor(restinterestDouble*100)/100);

NSLog(@"%.2f", floor(totalmoneyDouble*100)/100.0);

NSLog(@"%.2f", floor(moneyDouble*100)/100.0);

2016-11-01 08:55:59.257 四捨五入[11619:4785973] 4661998.08

2016-11-01 08:55:59.258 四捨五入[11619:4785973] 44818.12

2016-11-01 08:55:59.258 四捨五入[11619:4785973] 16808934.40

2016-11-01 08:55:59.259 四捨五入[11619:4785973] 38675.00