Casio SF-7100SY - Manual (Page 68)

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To correct errors in calculations
If you enter a wrong value, press C/AC once and then enter the correct value.
If you press the wrong arithmetic operator key (
!, @, #, $), simply press the correct
key before entering anything else.
About calculation errors...
Whenever an error occurs, the indicator “ERROR” appears on the display.
•
When the number of digits in the mantissa of an intermediate or a final result
exceeds 12 digits
•
When the number of digits in the mantissa of a value stored in memory exceeds
12 digits. In this case, the Digital Diary automatically retains the last value stored
that did not exceed 12 digits.
•
Division by zero
•
Attempting to calculate the square root of a negative value
To clear errors
Press C/AC once to continue with the same calculation. If you want to clear the
calculation and start again, press C/AC twice.
To enter the Calculator Mode
Press
} to display the initial Calculator Mode screen.
Example 1: 21 + 3 = 24
Example 2: 11 + 10% = 12.1