Page 278 - Computer Science V2.0 Class 11

01 '''
02 Objective: To display a student's grade, based on his/her percentage
03 User input: percentage of marks obtained by the student
04 Output: Student's grade: A, B, C, D, or F
05 '''
06 #Approach: First write a function to compute student's grade
07 def grade(percentage):
08 '''
09 Objective: To compute a student's grade, base d on his/her percentage
10 Input: percentage: percentage of marks obtained by t he student
11 Return Value: grade: A, B, C, D, F
12 cutoffs 75, 60, 50, 33, respectively
13 '''
14 cutOffA = 75
15 cutOffB = 60
16 cutOffC = 50
17 cutOffD = 33
18 if percentage >= cutOffA:
19 return 'A'
20 elif percentage >= cutOffB:
21 return 'B'
22 elif percentage >= cutOffC:
23 return 'C'
24 elif percentage >= cutOffD:
25 return 'D'
26 else :
27 return 'F'
28 percentage = int(input("Enter student's percentage: "))
29 yourGrade = grade(percentage)
30 print('Your grade is : ', yourGrade)
In the example given above, if percentage is 54, each of the the conditional expressions percentage >=
cutOffA, and percentage >= cutOffB yields (on evaluation) False, but the conditional expression
percentage >= cutOffC yields (on evaluation) True, so the statement:

return 'C'
is executed and the value of yourGrade is set equal to 'C'. Finally, on the execution of the statement:

print('Your grade is', yourGrade)
Python interpreter outputs the message:
Your grade is C

Sample Output:
>>> Enter student's percentage: 54
Your grade is C

Program 10.7 Write a program that checks whether a number is positive, negative, or zero, and displays an appropriate
message.

Solution:
01 #Objective: To check whether a number is positive, negative or zero
02 num = int(input("Enter a number : "))
03 if num > 0:
04 print("POSITIVE")
05 elif num < 0:
06 print("NEGATIVE")
07 else:
08 print("Number is ZERO")

264 Touchpad Computer Science (Ver. 2.0)-XI