Day4 branch and loop jobs

Basic questions

1. Print according to the range of grades entered pass perhaps fail, .

   achievement = int(input(' Please enter the grade ：'))
   
   

2. Print according to the entered age range adult perhaps A minor , If the age is not within the normal range (0~150) Print This is not a person !.

    age = int(input(' Please enter age ：'))
    if age > 150 or age < 0:
        print(' This is not a person ')
    elif age >= 18:
        print(' adult ')
    else:
        print(' A minor ')
   
   

3. Enter two integers a and b, if a-b The result is an odd number , The result is output , Otherwise, the prompt message will be output a-b The result is not an odd number

   a = int(input(' Please enter an integer ：'))
   b = int(input(' Please enter an integer ：'))
   if (a - b) % 2 == 0:
       print('a - b The result is not an odd number ')
   else:
       print(a - b)
   

4. Use for Cyclic output 0~100 All in 3 Multiple .

   for i in range(0, 101, 3):
      print(i)
   

5. Use for Cyclic output 100~200 The inner single digit or ten digit can be 3 Divisible number .

   for i in range(100, 201):
      if i // 10 % 10 % 3 == 0 or i % 10 % 3 == 0:
          print(i)
   
   

6. Use for Cycle statistics 100~200 The median ten is 5 The number of

   for i in range(100, 200):
       if i // 10 % 10 == 5:
           print(i)
   

7. Use for Loop printing 50~150 All can be 3 Divisible but not by 5 Divisible number

   for i in range(51, 151, 3):
       if i % 5 != 0:
           print(i)
   

8. Use for Cycle calculation 50~150 All can be 3 Divisible but not by 5 The sum of divisible numbers

   count = 0
   for i in range(51, 151, 3):
       if i % 5 != 0:
           count += i
   print(count)
   

9. Statistics 100 The inner single digits are 2 And can be 3 The number of integers .

   for i in range(12, 101, 3):
       if i % 10 == 2:
           print(i)
   

Advanced questions

1. Enter any positive integer , Ask him how many digits ？

   Be careful : You can't use strings here , Only loop

   num = int(input(' Please enter a positive integer ：'))
   
   for i in range(0, num):
       if num // 10 ** i == 0:
           break
           
    print(i)
   

2. Print out all the daffodils , The so-called narcissus number refers to a three digit number , Its figures ⽴ The sum of the squares is equal to the number itself .例 Such as :153 yes

   ⼀ individual ⽔ Fairy flower number , because 1³ + 5³ + 3³ be equal to 153.

   for i in range(100, 1000):
       bw = i // 100
       sw = i // 10 % 10
       gw = i % 10
       if bw ** 3 + sw ** 3 + gw ** 3 == i:
           print(i)
   

3. Judge whether the specified number is a prime number （ Prime numbers are prime numbers , In addition to 1 A number other than itself that cannot be divided by other numbers ）

   num = int(input(' Please enter one digit ：'))
   
   for i in range(2, num):
       if num % i == 0:
           print(f'{
           num} Not primes ')
           break
       else:
           print(f'{
           num} Prime number ')
   

4. Output 9*9 formula . Program analysis ： Branch and column considerations , common 9 That's ok 9 Column ,i The control line ,j Control the column .

   for i in range(1, 10):
       for j in range(1, i + 1):
           print(f'{
           i}* {
           j}= {
           i * j} ', end=' ')
       print()
   

5. This is the classic " A hundred horses and a hundred burdens " problem , There are a hundred horses , Carry a hundred loads , Big horse, big horse 3 Dan , On the back of a horse 2 Dan , Two ponies carry 1 Dan , How big is it , in , How many ponies each ？（ You can directly use the exhaustive method ）

   for i in range(34):
       for j in range(51):
           if i * 3 + j * 2 + (100 - i - j) / 2 == 100:
               print(f' Malaysia {
           i} A medium horse {
           j} A pony {
           100- i - j } horse ')