How can we tell if 11111111 represents: 255 (in the binary number system used to represent unsigned values) -1 (in the 2s complement code used to represent signed values) 127 (in the Excess-128 code) 128 (in the Excess-127 code) values)

In this case: the data type information provides the context to use the correct encoding method.

short x = -1; // signed numeric variable in C++ // It stores 11111111 11111111 in x cout << x; // Prints -1 unsigned short y; // unsigned numeric variable in C++ y = x; // Stores 11111111 11111111 in y cout << y; // Prints 65535 (2^16 - 1)

The variable type information gives the context to the program on how to interprete the representation

Each data type uses its own code:

unsigned int uses the binary number system unsigned short uses the binary number system int uses the 2s complement code short uses the 2s complement code

Because each variable in Java (and C) must be defined using a data type, the Java compiler can know which code it needs to use to interpret the binary number stored in a variable.

• Prog file: /home/cs255001/demo/C++/context-info.C

• Compile: g++ context-info.C
• Run: a.out

Make a correct English sentence that start with: You is ....

Answer:

You is an English word.

You can be used as a personal pronoun (this is the most frequent scenario - so frequent, that you don't realize there is another context !!!) You can be an English word !!!

The context in which you used the word "you" has always been as a personal pronoun You was not aware that the word you can be used in a different context.

(Millie is in Kindergarten,,,,) TEACHER: Millie, give me a sentence starting with 'I. ' MILLIE: I is.. TEACHER: No, Millie..... Always say, 'I am.' MILLIE: All right... 'I am the ninth letter of the alphabet.'