Conditional statement while

#looping/iteration

  def: to repeat instruction of set of instruction(program)

  C/C++/java/javascript/php

   1.while        2.do..while    3.for    4.(C++/java) for each

   1.while   ---> Iteration

      syntax:
          1.
          Declaration loop var
          while test-condition:
              -------------------
              -------------------
              modify/update counter
              ------------------
          2.
          Declaration loop var
          while test-condition:
              -------------------
              -------------------
              modify/update counter
              ------------------
          else:
              --------------
              --------------
   2.for each----


                       (i).(for range()  )
                                a.          //group of value
                                for var in range(start,stop,end):   #for(start;test;modify(indecrement)
                                    -----------------------------
                                    -----------------------------
                                    -----------------------------

                                b.          //group of value
                                for var in range(start,stop,end):   #for(start;test;modify(indecrement)
                                    -----------------------------
                                    -----------------------------
                                    -----------------------------
                               else: #(optional)
                                   ------------------
                                   ------------------
                                   ------------------
                       ---- each
                       (ii).(for  each)
                                                //List,Tuple,set,dict(keys/values)
                             a.
                             for  var in groupofvalue:
                                 --------------------
                                 --------------------
                                 --------------------
                                 --------------------
                                
                            b.
                             for  var in groupofvalue:
                                 --------------------
                                 --------------------
                                 --------------------
                                 --------------------
                            else:
                                ----------------
                                ----------------
                                ----------------
                                
                                
                                
                                
                                
  count=1
while count<=3:
    print("sushil")
    #count=count+1 ---shorhand--->count+=1
    count+=1 # count++ (wrong) no increment and decrement operator found in python

''' tracing----strong----looping very very strong
count=1
while   1<=3: #true
    print("sushil")  ---sushil
    #count=count+1 ---shorhand--->count+=1
    #count=1+1---=2
    count+=1 # count++ (wrong) no increment and decrement operator found in python

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

count=2
while   2<=3: #true
    print("sushil")  ---sushil
    #count=count+1 ---shorhand--->count+=1
    #count=2+1---=3
    count+=1 # count++ (wrong) no increment and decrement operator found in python
-----------------------------------------

count=3
while   3<=3: #true
    print("sushil")  ---sushil
    #count=count+1 ---shorhand--->count+=1
    #count=3+1---=4
    count+=1 # count++ (wrong) no increment and decrement operator found in python
--------------------------------------

count=4
while 4<=3: #false
   --------------
   --------------
   ---------------

exit from loop  '''


n=1
while n<=10:
    print(2**n,end=' ')
    n+=1

print()
n=1
while n<=10:
    print(pow(2,n),end=' ')
    n+=1
print()
import math
n=1
while n<=10:
    print(math.pow(2,n),end=' ')
    n+=1
    
    
    
    
    
    cont=0;
while True:
    n=int(input("Enter any number:"))
    i=1
    while i<=10:
        print(n,"x",i,"=",n*i)
        i+=1
    cont=int(input("press 1 to cont.."))
    if cont!=1:
        break
        
        
        
        
        ''sum of series ----> even number print
                              find of even number

                              fixed range  //1-20----even value sum---2,4,6,....18,20
                              Dynamic end
                              dynamic start end of range'''

r=1
sum=0
while r<=20:
    if r%2==0:
        print(r,end=" ")
        sum+=r
    r+=1
print("Sum of  Even value=",sum)
print()
r=2
last=int(input("Enter range end point:"))
while r<=last:
    print(r,end=" ")
    r+=2
print()
first=int(input("Enter range end point:"))
last=int(input("Enter range end point:"))
while first<=last:
    print(first,end=" ")
    first+=2
    
    
    
    
    sum=0
st=int(input("Enter range end point:"))  #5
ed=int(input("Enter range end point:")) #7
while st<=ed:  # 8<=7  --5 6,7  8(end)
    sqr=st*st     #7*7=49
    sum+=sqr   #sum+=49==sum=sum+sqr=61+49=110
    print(sqr,end=" ") #49
    st+=1           #8
    

print("Sum of square of given range value:",sum)



'''find factorial of number----> import math-----math.factorial(5)---120

//input-----  -ve value are not allowed to factorial
num=5     n*(n-1)*(n-2) ...(n-(n-1))
                5*4*3*2*1  --*1 one loop cycle waste
                5*4*3*2

                f=1                       
                //reverse loop  5----->2(end) fix
                f*=num
                num-=1
                '''
num=int(input("Enter any value:"))
if num>=0:
    #find factorial
    f=1
    while num>=2:
        f*=num
        num-=1
    print("Factorial of number=",f)
        
else:
    print("-ve value is not allwoed to calc factorial")
    
    
    
    
    #print factorial between range----nested while loop
                                                # range-----2-10---while  ----Outter
                                                #---calc---while factorial   ---inner
H\W
while  range:

    while factorial:
        calc
        modify/udpate inner loop
    print("Factoril",f)
    modify/update outter loop