What does 0xFE mean in a C program?

Question

In the given program below,

void main()
{

       int x=0xFE;

       int y=0xF3;
      .....
}

What values are assigned by x=0xFE and y=0xF3? What does 0x represent?

Answer 1

Writing a value with 0x before means it is written in hexadecimal notation, where the numbers 0-9 and additional "number" A-F are used to get a number system with the base 16. The big advantage of this is that each hexadecimal digit represents exactly 4 bits.

0xFE = 254
0xF3 = 243

So x = 254 and y = 243.