ExclusivePrice、数量都是 NSDecimalNumbers。
NSDecimalNumber *price = [exclusivePrice decimalNumberByMultiplyingBy:quantity];
NSLog(@"%@ * %@ = %@", exclusivePrice, quantity, price);
我得到的结果：
2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = -0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007169919476068871316457914368
我所期望的：
2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = 130
谁能解释一下吗？
Edit:
完整重现：
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSDecimalNumber *n2 = (NSDecimalNumber *)[formatter numberFromString:@"2"];
NSDecimalNumber *n1 = (NSDecimalNumber *)[NSDecimalNumber numberWithInt:65];
NSDecimalNumber *n3 = [n1 decimalNumberByMultiplyingBy:n2];
NSLog(@"%@ * %@ = %@", n1, n2, n3);
似乎对我有用。
NSDecimalNumber * n1 = [NSDecimalNumber decimalNumberWithString:@"65"];
NSDecimalNumber * n2 = [NSDecimalNumber decimalNumberWithString:@"2"];
NSDecimalNumber * res = [n1 decimalNumberByMultiplyingBy:n2];
NSLog(@"%@ * %@ = %@", n1, n2, res);
Output:
2010-04-05 08:40:42.812 x[24301] 65 * 2 = 130
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