Clear Buttons
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The clear buttons delete all or a portion of the calculator's numeric display. Some clear buttons also remove pending operators and tape entries. The buttons are defined below in order of least impacting to most impacting:

btnback Backspace Button  
Clears the last digit entered.  
Keyboard = Backspace  
 
 
btnce Clear Entry Button  
Clears the value in the numeric display.  
Keyboard = Delete  
 
 
btnc Clear Button  
Clears the current calculation and totals.  
Keyboard = Esc  
 
 
btnct Clear Tape Button  
Clears the tape entries, current calculation, and totals. The Clear Tape Button is disabled when the tape is off.  
Keyboard = Shift + Delete  


See also:
Numeric Buttons  
Operator Buttons  
Function Buttons  
Memory Buttons