Convert Int to Char in Java

How can I convert a char to int in Java?

The ASCII table is arranged so that the value of the character '9' is nine greater than the value of '0'; the value of the character '8' is eight greater than the value of '0'; and so on.

So you can get the int value of a decimal digit char by subtracting '0'.

char x = '9';
int y = x - '0'; // gives the int value 9

Converting Integer to Character in Java

Character.forDigit(C, 10)

Try this, it should work.

Java implicit conversion between int and char

Just write the char conversion to ASCII code (below your statements)

int x = '0' + 1 - '5'
        48  + 1 - 53 = -4 

int y = '5' - 0 + '1'
         53 - 0 + 49 = 102

int y = '5' - '0' + '1'
         53 - 48  + 49 = 54

Notice it's consistent, each int remains int and each char converted to ASCII code

Java - Problem with casting an int to char

In addition to the other answers: If you know for sure that 0 <= k <= 9, you can use

System.out.println((char)(k + '0'));

to print the 'charified' version of your integer.
If k < 0 or k > 9, there isn't a single char (character) describing it. In that case, you'll have to use a string, which is basically an array of chars:

System.out.println(Integer.toString(k));

Converting a int to char and then back to int - doesn't give same result always

This is because, while an int is 4 bytes, a char is only 2 bytes. Thus, you can't represent all values in a char that you can in an int. Using a standard unsigned integer representation, you can only represent the range of values from 0 to 2^16 - 1 == 65535 in a 2-byte value, so if you convert any number outside that range to a 2-byte value and back, you'll lose data.

How to convert integer to char

Use Char(n + '0'). This will add the ASCII offset of the 0 digit and fix the rest of the digits too. For example:

julia> a = 5
5

julia> Char(a+'0')
'5': ASCII/Unicode U+0035 (category Nd: Number, decimal digit)

Also note, timing with @time is a bit problematic, especially for very small operations. It is better to use @btime or @benchmark from BenchmarkTools.jl .

---

Related Topics