Iteration and Conditions

#Count and print the numbers that are either divisible by 3 or 5 or both, from 1 to 30.

count = 0
for i in range (0,31):
    if i%3==0 or i%5==0 :
        count += i
        print (i,"=",count)
print("Total amount:",count)

#--------------------------------------------------------------------------------------

#Find the maximum number among three numbers. [N.B: you do not know whether they are unique in value or not. Therefore, check all the possible conditions.]

num1 = int(input("Enter a number: "))
num2 = int(input("Enter a number: "))
num3 = int(input("Enter a number: "))
if num1 > num2 and num1 > num3:
    max = num1
elif num2 > num1 and num2 > num3:
    max = num2
else:
    max = num3
print("Maximum Number is: ",max)
if max % 2!= 0 and max % 3!= 0:
    print(max,"is a unique value.")
else:
    print(max,"is not a unique value.")
    
#--------------------------------------------------------------------------------------

#BRAC UNIVERSITY has following rules for grading system: (a. Equal to or above 90 - A)
#(b. Greater than or equal to 85 - less than or equal to 89 - A-) (c. Greater than or equal to 80 - less than or equal to 84 - B+) 
#(d. Greater than or equal to 75 - less than or equal to 79 - B) (e. Greater than or equal to 70 - less than or equal to 74 - B-)
#(f. Greater than or equal to 65 - less than or equal to 69 - C+) (g. Greater than or equal to 60 - less than or equal to 64 - C)
#(h. Greater than or equal to 57 - less than or equal to 59 - C-) (i. Greater than or equal to 55 - less than or equal to 56 - D+)
#(j. Greater than or equal to 52 - less than or equal to 54 - D) (k. Greater than or equal to 50 - less than or equal to 51 - D-)
#(l. Less than 50 - F) Ask users to enter marks and print the corresponding grade.

marks = int(input("Enter your marks: "))
if marks < 50:
    print("You got F.")
elif marks >= 85 and marks <= 89:
    print("You got A-.")
elif marks >= 80 and marks <= 84:
    print("You got B+.")
elif marks >= 75 and marks <= 79:
    print("You got B.")
elif marks >= 70 and marks <= 74:
    print("You got B-.")
elif marks >= 65 and marks <= 69:
    print("You got C+.")
elif marks >= 60 and marks <= 64:
    print("You got C.")
elif marks >= 57 and marks <= 59:
    print("You got C-.")
elif marks >= 55 and marks <= 56:
    print("You got D+.")
elif marks >= 52 and marks <= 54:
    print("You got D.")
elif marks >= 50 and marks <= 51:
    print("You got D-.")
else:
    print("You got A.")
    
#--------------------------------------------------------------------------------------

#Determine whether a number is prime or not. [N.B. prime number is divisible by 1 and the number itself]

num = int(input("Enter a number: "))  
if num > 1:
   for i in range(2,num):
       if (num % i) == 0:
           print(num,"is not a prime number")
           print(i,"times",num//i,"is",num)
           break
   else:
       print(num,"is a prime number")  
else:  
   print(num,"is not a prime number")
   
#--------------------------------------------------------------------------------------

#Print all the fibonacci numbers from 0 - N, where N is a user defined number. ( Fibonacci numbers is a number which is the summation  of 
#the previous two fibonacci numbers starting from 0. Like 0 1 1 2 3 5...)