IGCSE COMPUTER SCIENCE PAPER #2
EXAM GUIDE QUESTIONS AND
ANSWERS
Double entry - Answer-Data is entered twice, sometimes by different operators; the
computer system compares both entries and outputs an error message requesting that
the data is entered again if they are different.
Screen check - Answer-is a manual check completed by the user who is entering the
data. When the data entry is complete the data is displayed on the screen and the user
is asked to confirm that it is correct before continuing.
The effectiveness of a solution
- 4 factors - Answer-1. Does the solution work for all sets of data?
2. Does the solution have any unnecessary processes that are never used?
3. Are any actions repeated more often than necessary?
4. Can the solution be simplified and still work as well?
Begin/end flowchart - Answer-
Process flowchart - Answer-Shows when values are assigned to a variable
Input/output flowchart - Answer-
Decision flowchart - Answer-
Flow lines - Answer-
Constant - Answer-A named data store that contains a value that does not change
during execution of a program
Variable - Answer-A named data store that contains a value that may change during
execution of a program
Integer - Answer-whole number
Real - Answer-Positive/negative number with fractional part
Char - Answer-single character
String - Answer-A sequence of characters
EXAM GUIDE QUESTIONS AND
ANSWERS
Double entry - Answer-Data is entered twice, sometimes by different operators; the
computer system compares both entries and outputs an error message requesting that
the data is entered again if they are different.
Screen check - Answer-is a manual check completed by the user who is entering the
data. When the data entry is complete the data is displayed on the screen and the user
is asked to confirm that it is correct before continuing.
The effectiveness of a solution
- 4 factors - Answer-1. Does the solution work for all sets of data?
2. Does the solution have any unnecessary processes that are never used?
3. Are any actions repeated more often than necessary?
4. Can the solution be simplified and still work as well?
Begin/end flowchart - Answer-
Process flowchart - Answer-Shows when values are assigned to a variable
Input/output flowchart - Answer-
Decision flowchart - Answer-
Flow lines - Answer-
Constant - Answer-A named data store that contains a value that does not change
during execution of a program
Variable - Answer-A named data store that contains a value that may change during
execution of a program
Integer - Answer-whole number
Real - Answer-Positive/negative number with fractional part
Char - Answer-single character
String - Answer-A sequence of characters
