Section 14: Flags218
Hexadecimal/Decimal Equivalents  
  Hexadecimal   Decimal  
  0   0  
  1   1  
  2   2  
  3   3  
  4   4  
  5   5  
  6   6  
  7   7  
  8   8  
  9   9  
  A   10  
  B   11  
  C   12  
  D   13  
  E   14  
  F   15  
Jill’s program initializes itself by storing the letters A through E in storage registers R10 through R15. The program then uses the storage register number to assign a value to the hexadecimal letter that is input.
Here is a flow chart that will help you understand how the program uses the data input flags to determine whether numeric data or ALPHA data was input.