Ruby has this functionality built in: Integer(‘1001’) # => 1001 Integer(‘1001 nights’) # ArgumentError: invalid value for Integer: “1001 nights” As noted in answer by Joseph Pecoraro, you might want to watch for strings that are valid non-decimal numbers, such as those starting with 0x for hex and 0b for binary, and potentially more tricky … Read more
Right-click your Watch Window or Immediate Window and uncheck Hexadecimal Display option.
You do this using the modulus operator, % n % k == 0 evaluates true if and only if n is an exact multiple of k. In elementary maths this is known as the remainder from a division. In your current approach you perform a division and the result will be either always an integer … Read more
double supports Infinity double inf = Double.POSITIVE_INFINITY; System.out.println(inf + 5); System.out.println(inf – inf); // same as Double.NaN System.out.println(inf * -1); // same as Double.NEGATIVE_INFINITY prints Infinity NaN -Infinity note: Infinity – Infinity is Not A Number.
Numpy arrays have an astype method. Just do y.astype(int). Note that it might not even be necessary to do this, depending on what you’re using the array for. Bool will be autopromoted to int in many cases, so you can add it to int arrays without having to explicitly convert it: >>> x array([ True, … Read more
ASCII to int: ord(‘a’) gives 97 And back to a string: in Python2: str(unichr(97)) in Python3: chr(97) gives ‘a’
Yes, it is possible. For example, for gcc you can use __builtin_unreachable to tell the compiler about impossible conditions, like so: if (value < 0 || value > 36) __builtin_unreachable(); We can wrap the condition above in a macro: #define assume(cond) do { if (!(cond)) __builtin_unreachable(); } while (0) And use it like so: assume(x … Read more
CStr(45) is all you need (the Convert String function)
There’s a striking difference here. valueOf is returning an Integer object, which may have its values cached between -128 and 127. This is why the first value returns true – it’s cached – and the second value returns false – 128 isn’t a cached value, so you’re getting two separate Integer instances. It is important … Read more
The JVM is caching Integer values. Hence the comparison with == only works for numbers between -128 and 127. Refer: #Immutable_Objects_.2F_Wrapper_Class_Caching