Weekly Programming Exercise #5

Not graded. 
Solution will be discussed on Monday, 10/19. 


1) Convert the following decimal numbers into binary numbers in signed 2's complement system.

  a. 27  
  b. -6
  c. 64
  d. 255
  e. -24 

2) Binary numbers are inconvenient because they're too long and not easy to read. A hexadecimal notation is a base-16 system frequently used in its place. One hexadecimal digit represents four bits.   

   Binary       Hexadecimal       Decimal 
     1111              F             15
     1110              E             14
     1101              D             13
     1100              C             12
     1011              B             11
     1010              A             10
     1001              9              9 
     1000              8              8
     0111              7              7 
     0110              6              6 
     0101              5              5 
     0100              4              4 
     0011              3              3 
     0010              2              2 
     0001              1              1 
     0000              0              0 

  Note that the alphabet A ~ F is used as a digit in the hexadecimal system to express values that are greater or equal to 10.

  To print an integer in hexadecimal notation, use %x or %X within printf().

  Try to write the decimal numbers from problem 1 in hexadecimal format. 
  Then use printf to check your answer.