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Convert string to long integer in java algorithm
Convert string to long integer in java algorithm




  1. Convert string to long integer in java algorithm how to#
  2. Convert string to long integer in java algorithm code#
  3. Convert string to long integer in java algorithm series#
  4. Convert string to long integer in java algorithm free#

* to convert String to long primitive in Java. * Java program to convert String to long in Java.

Convert string to long integer in java algorithm code#

In this Java tutorial, we will learn 3 different ways to convert String to long by code examples and we will also analyze the pros and cons of each approach.

Convert string to long integer in java algorithm how to#

This article is in continuation of our previous conversion tutorial like how to convert String to Double in Java or how to convert String to Enum in Java. Though you need to remember few things while dealing with long and String first of all long is the primitive type which is wrapped by the Long wrapper class and String is an Object in Java backed by character array.īefore Java 5 you need to take an extra step to convert a Long object into a long primitive but after the introduction of autoboxing and unboxing in Java 5, Java language will perform that conversion for you. Converting String to long is similar to converting String to Integer in Java, in-fact if you know how to convert String to Integer then you can convert String to Long by following the same procedure. An error is signalled by returning `-1'.How to convert a string to long in Java is one of those frequently asked questions by a beginner who has started learning Java programming language and is not aware of how to convert from one data type to another.

convert string to long integer in java algorithm

* newly allocated storage which is pointed to by `*o' upon successful * The number of characters from the input string `s' which were * letter characters may be in either upper or lower case. * Generates a printable binary representation of an input number * int convert_num(char const* s, int b, char** o) * convert_num - convert a numerical string (str) of base (b) to Making it really work is an exercise for the reader. It probably contains bugs in edge cases, but it does compile and work as expected at least for positive numbers. If a C/C++ solution is acceptable, I believe that the following is what you are looking for is something like the following. If you really don't need arbitrary precision, then take advantage of the runtime. I'm not sure if a lookup table approach is possible or not. I wrote this before your clarifying comment so it probably isn't quite is applicable.

convert string to long integer in java algorithm

Then, you are only reduced to adding n numbers, rather than multiplying and adding n numbers (plus the cost of the memory of the lookup table) The best you can do is have a lookup table of the form: (a,b) where a is the digit position, and b is the digit (0.9). You'll notice that the multiplication never gets simple, so you can't have any lookup tables and do bitshifts and ors, no matter how big you group them. So if you have the lookup table of A = (0b000 to 0b111), then the multiplication is always by 1 and some trailing zeros, so the multiplication is simple (just shifting left). To convert string to integer, first we need to know what place value each digit must be multiplied by. The reason that it is possible for base 8 (and 16) is that the way the conversion works is following: The parseInt method is to convert the String to an int and throws. This is not possible in bases that aren't powers of two to convert to base-2. Answer: Convert a string to an integer with the parseInt method of the Java Integer class.

Convert string to long integer in java algorithm free#

I am aware of the multiply and add solution but since these are arbitrary length numbers, the multiply and add operations are not free so I'd like to avoid them, if at all possible.

convert string to long integer in java algorithm

I know that for base 10, you can't just give it one digit at a time, so the solution would likely have to lookup a group of digits at a time. I was curious if anyone had any clever way to figure out how to generate a generic look up table for Base X -> Base 2.

convert string to long integer in java algorithm

It's definitely not so obvious with base 10, though. I know that I could write the algorithm like atoi does and do a bunch of multiplies and adds, but for this specific problem I'm trying to see if I can do it with a look up table. However, my problem is that I want to do this look up table method for odd bases, like base 10.

Convert string to long integer in java algorithm series#

I can simply use a lookup table for each digit to get a series of bits. I have found that this is simple for binary, octal, and hexadecimal. My solution now does what the atoi() function does, but I was curious purely out of academic interest if a lookup table solution is possible. I want to be able to take, as input, a character pointer to a number in base 2 through 16 and as a second parameter, what base the number is in and then convert that to it's representation in base 2.






Convert string to long integer in java algorithm