Learning Python- Day 3

DAY 3

             

Today we will be doing Loops. There are 2 types of loops 1) for 2) while.

Todays focus is for loop

i in the for loop is a variable with values between 0 and n-1

n=int(input("Enter a number"))
for i in range(n):
    print("hello")

run the function CTL+shift+fn+F10

Enter a number10

hello

hello

hello

hello

hello

hello

hello

hello

hello

hello

n=int(input("Enter a number"))
for i in range(n):
    print(i)

run the function CTL+shift+fn+F10

Enter a number7

0

1

2

3

4

5

6

n=int(input("Enter a number"))
for i in range(1,n+1):
    print(i)

run the function CTL+shift+fn+F10

Enter a number7

1

2

3

4

5

6

7

n=int(input("Enter a number"))
for i in range(1,n+1,2):
    print(i)

run the function CTL+shift+fn+F10

Enter a number7

1

3

5

7

If we look at the above program,and look at the line for i in range(1,n+1,2): Here 1 is start, n+1 is the end and 2 is the step

Table example

n=int(input("enter a number"))

print("table of",n,"is")

for i in range(1,11):

    print(n*I, end=" ")

run the function CTL+shift+fn+F10

enter a number7

table of 7 is

7 14 21 28 35 42 49 56 63 70

Use end=" " to have output in same line or row

Even number example

n=int(input("enter a number"))
print("even no. from 1 to",n,"are")
for i in range(1,n+1):
    if(i%2==0):
        print(i)

run the function CTL+shift+fn+F10

enter a number7

even no. from 1 to 7 are

2

4

6

Even numbers within a range

l=int(input("enter a lower range number"))

u=int(input("enter a upper range number"))

print("even no. from ",l,"to",u,"are")

for i in range(l,u+1):

    if(i%2==0):

        print(I,end=" ")

run the function CTL+shift+fn+F10

enter a lower range number5

enter a upper range number15

even no. from  5 to 15 are

6 8 10 12 14

Sum of natural numbers

n=int(input("enter a number"))
s=0
for i in range(1,n+1):
    s=s+i
    print("sum=",s,end=" ")

run the function CTL+shift+fn+F10

enter a number5

sum= 1 sum= 3 sum= 6 sum= 10 sum= 15

Whether given no is prime or  not example

n=int(input("enter a number"))
f=0
for i in range(2,n):
    if(n%i==0):
        f=1
        break
if(f==0):
    print("prime no")
else:
    print("not a prime no")

run the function CTL+shift+fn+F10

p

enter a number7

prime no

Prime no. within range

l=int(input("enter a lower range number"))
u=int(input("enter a upper range number"))
print("Prime no. from",l,"to",u,"are")
for i in range(l,u+1):
    f=0
for j in range(2,i//2+1):
    if(i%j==0):
        f=1
        break
if(f==0):
    print(i)

Backward loop

n=int(input("Enter a number"))
for i in range(n,0,-1):
    print(i,end=",")

run the function CTL+shift+fn+F10

Enter a number9

9,8,7,6,5,4,3,2,1,

Learning python- Day 4