While, If, Count Statements

[Cai Gengyang]

On Tuesday, November 28, 2017 at 6:09:17 AM UTC+8, Ned Batchelder wrote:
> On 11/27/17 7:54 AM, Cai Gengyang wrote:
> > Input :
> >
> > count = 0
> >
> > if count < 5:
> >    print "Hello, I am an if statement and count is", count
> >
> > while count < 10:
> >    print "Hello, I am a while and count is", count
> >    count += 1
> >
> > Output :
> >
> > Hello, I am an if statement and count is 0
> > Hello, I am a while and count is 0
> > Hello, I am a while and count is 1
> > Hello, I am a while and count is 2
> > Hello, I am a while and count is 3
> > Hello, I am a while and count is 4
> > Hello, I am a while and count is 5
> > Hello, I am a while and count is 6
> > Hello, I am a while and count is 7
> > Hello, I am a while and count is 8
> > Hello, I am a while and count is 9
> >
> > The above input gives the output below. Why isn't the output instead :
> >
> > Hello, I am an if statement and count is 0
> > Hello, I am a while and count is 0
> > Hello, I am an if statement and count is 1
> > Hello, I am a while and count is 1
> > Hello, I am an if statement and count is 2
> > Hello, I am a while and count is 2
> > Hello, I am an if statement and count is 3
> > Hello, I am a while and count is 3
> > Hello, I am an if statement and count is 4
> > Hello, I am a while and count is 4
> > Hello, I am a while and count is 5
> > Hello, I am a while and count is 6
> > Hello, I am a while and count is 7
> > Hello, I am a while and count is 8
> > Hello, I am a while and count is 9
> 
> It's easy to imagine that this sets up a rule that remains in effect for the
> rest of the program:
> 
>  â â â  if count < 5:
>  â â â â â â â  print "Hello, I am an if statement and count is", count
> 
> But that's not how Python (and most other programming languages) works.â Python
>  reads statements one after another, and executes them as it encounters them.â 
>  When it finds the if-statement, it evaluates the condition, and if it is true
> *at that moment*, it executes the contained statements.â  Then it forgets all
> about that if-statement, and moves on to the next statement.
> 
> --Ned.



Sure, so how would the code look like if I want the "if" statement to be nested inside the "while" loop and give me the result :


Hello, I am an if statement and count is 0 
Hello, I am a while and count is 0 
Hello, I am an if statement and count is 1 
Hello, I am a while and count is 1 
Hello, I am an if statement and count is 2 
Hello, I am a while and count is 2 
Hello, I am an if statement and count is 3 
Hello, I am a while and count is 3 
Hello, I am an if statement and count is 4 
Hello, I am a while and count is 4 
Hello, I am a while and count is 5 
Hello, I am a while and count is 6 
Hello, I am a while and count is 7 
Hello, I am a while and count is 8 
Hello, I am a while and count is 9