iOS 数字字符串的直接运算 + - * /
NSDecimalNumber *d1 = [NSDecimalNumber decimalNumberWithString:@"3.14"];
NSDecimalNumber *d2 = [NSDecimalNumber decimalNumberWithString:@"2"];
NSDecimalNumber *s = [d1 decimalNumberByAdding:d2];
NSLog(@"s = %@",s);
s = [d1 decimalNumberBySubtracting:d2];
NSLog(@"s = %@",s);
s = [d1 decimalNumberByMultiplyingBy:d2];
NSLog(@"s = %@",s);
s = [d1 decimalNumberByDividingBy:d2];
NSLog(@"s = %@",s);
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