How to answer these questions

Question

Chapter 3, Section 3.1 for Loop

Note: they use xrange in the book we will use range

Reading 3.1, Exercises 3.1

1. Write the outputs of the following loops
2. a.   for count In range(5):

         print count + 1

    b.  for count in range(1,4):

         print count

     c.  for count in range(1,6,2):

          print count

      d. for count in range(6,1,-1):

          print count

1. Write a loop that prints your name 100 times. Each output should begin

   on a new line.

 3. Explain the role of the variable in the header of a for loop.

1. Write a loop that prints the first 128 ASCII values followed by the

   corresponding characters (see the section on characters in Chapter 2).

1. Assume that the variable testString returns to a string. Write a loop

   that prints each character in this string, followed by its ASCII value.

Answer 1

There are compiler errors that need to be

addressed. Parenthesis are required in the

print statement and the indentation is in quetion

for each of these exercises.

Part A:

Actually it is a compiler error!

The parenthesis are missing around count+1,

the argument to the print statement...

The indentation is also in question.

Once added the code fragement becomes:

for count in range(5):

print(count+1)

which produces output:

1

2

3

4

5

note that range(5) is actually the set {0,1,2,3,4};

to which one is added to get the output. The loop

is zero based, which means it stops ONE LESS than

the parameter of 5.

So range(10) as an addition example is 0,1,2,3,4,5,6,7,8,9

and range(100) is 0,1,2,3,....,97,98,99

---------------------------------------------------

Part B:

again, parenthesis are needed and the indentation is in question.

once fixed the output shall be:

1

2

3

because it is instructed to stop at 1 and end at 4-1=3.

Part C:

Barring the compiler errors, the RANGE statement says

to begin at 1, end at 5 increasing by 2. so the output is:

1

3

5

Part D:

Again, barring the compiler errors, once fixed, the

RANGE statement instructs to begin at 6, stops at 2,

a DECREASES by 1.

the output is:

6

5

4

3

2

(1)

for count in range(100):

print ("your name")

(3) it's the loop counter

(1)

for count in range(128):

print (str(count) + " = " + str(chr(count)))

(1)

for count in range(128):

print (str(count) + " = " + str(chr(count)))

print("------ printables only ----------------")

for count in range(32,127):

print (str(count) + " = " + str(chr(count)))

(1)

# A FUNCTION returns values; A variable does not return

# values, but rather STORES a value in memory....

# anyways....

def AsciiDump(strbuff):

n = len(strbuff)

print("-----------------------------------------------")

for i in range(n):

print(str(strbuff[i]) + " = " + str(ord(strbuff[i])))

testString = "The quick brown fox jumped over the lazy dogs."

AsciiDump(testString)

testString="THE QUICK BROWN FOX JUMPED OVER THE LAZY DOGS."

AsciiDump(testString)