number-systems

I read that the range of an int is dependent on a byte. So taking int to be 4 bytes long, thats 4 * 8 bits = 32 bits. So the range should be : 2 ^ (32-1) = 2 ^ (31) Why do some people say its 2^31 - 1 though? Thanks! Because the counting starts from 0 And the range of int is 2,147,483,647 and 2^32 which is 2,147,483,648 . hence we subtract 1 Also the loss of 1 bit is for the positive and negative sign Check this interestinf wiki article on Integers:- The most common representation of a positive integer is a string of bits, using the binary numeral system. The order of the memory bytes storing

So I'm creating a program to show number systems, however I've run into issues at the first hurdle. The program will take a number from the user and then use that number throughout the program in order to explain several computer science concepts. When explaining my first section, number systems, the program will say what type of number it is. I'm doing this by converting the string into a float number. If the float number only has '.0' after it then it converts it into a integer. Currently I'm using this code while CorrectNumber == False: try: Number = float(NumberString) - 0 print (Number)

In the given program: int main() { char *p = "\0777"; printf("%d %d %d\n",p[0],p[1],p[2]); printf("--%c-- --%c-- --%c--\n",p[0],p[1],p[2]); return 0; } It is showing the output as: 63 55 0 --?-- --7-- ---- I can understand that it is converting the first two characters after \0 (\077) from octal to decimal but can any one explain me why 2 characters, why not 1 or 3 or any other ? Please explain the logic behind this. char *p = "\07777"; Here a string literal assigned to a pointer to a char. "\07777" In this string literal octal escape sequence is used so first three digits represents a octal

According to Apache Commons Lang's documentation for StringUtils.isNumeric() , the String '१२३' is numeric. Since I believed this might be a mistake in the documentation, I ran tests to verify the statement. I found that according to Apache Commons it is numeric. Why is this String numeric? What do those characters represent? Because that "CharSequence contains only Unicode digits" (quoting your linked documentation ). All of the characters return true for Character.isDigit : Some Unicode character ranges that contain digits: '\u0030' through '\u0039', ISO-LATIN-1 digits ('0' through '9') '