How can the defensive programming be entered into a Raptor program? How does it work within a loop?

How can this defensive programming be incorporated within the Raptor program???

Question: How can defensive programming be added to this in case the user enters a negative number for a sc...

How can defensive programming be added to this in case the user enters a negative number for a score?

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// Add while Loop to defensive programming in case the user enters a negative number for a score

while(Marks

// user enters a negative number for a score

Write "Invalid input!! Marks should not be negative"

Write "Please re-enter the marks in subject:"+J

// read and store the input in variable Marks

Input Marks

End while

Set Sum Sum+ Marks End For (J) calculate the average of marks for each student Set StAvg Sum /3 I display the average marks Write "The average marks of the student"sStAvg calculate the sum of marks of all the students in I the class Set Total Total + Sum Set Sum 0 End For (I) calculate the class average Set ClsAvg-Total/ NumStudent Idisplay the class average Write "The average marks of the class is"ClsAvg Set Sum Sum+ Marks End For (J) calculate the average of marks for each student Set StAvg Sum /3 I display the average marks Write "The average marks of the student"sStAvg calculate the sum of marks of all the students in I the class Set Total Total + Sum Set Sum 0 End For (I) calculate the class average Set ClsAvg-Total/ NumStudent Idisplay the class average Write "The average marks of the class is"ClsAvg