Assignment/Assignment 11.py at main · Soumen3/Assignment · GitHub

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        # Assignment - 11

# 1. Write a python script to calculate sum of first N natural numbers

N=int(input('Enter the value of N:\t'))
sum=0
while N:
    sum=sum+N
    N-=1
print('The sum is:',sum)


# 2. Write a python script to calculate sum of squares of first N natural numbers

N=int(input('Enter the value of N:\t'))
sum=0
while N:
    sum=sum+(N**2)
    N-=1
print('The sum is:',sum)


# 3. Write a python script to calculate sum of cubes of first N natural numbers

N=int(input('Enter the value of N:\t'))
sum=0
while N:
    sum=sum+(N**3)
    N-=1
print('The sum is:',sum)


# 4. Write a python script to calculate sum of first N odd natural numbers

N=int(input('Enter the value of N:\t'))
sum=0
N=(2*N)-1
while N>0:
    sum=sum+N
    N-=2
print('The sum is:',sum)


# 5. Write a python script to calculate sum of first N even natural numbers

N=int(input('Enter the value of N:\t'))
sum=0
N=(2*N)
while N>0:
    sum=sum+N
    N-=2
print('The sum is:',sum)


# 6. Write a python script to calculate factorial of a given number

n=int(input("Enter the number:\t"))
f=1
for r in range(1,n+1):
    f=f*r
print("the factorial of given number is:",f)


# 7. Write a python script to count digits in a given number

num=int(input('Enter a number:\t'))
len=0
while num!=0:
    len+=1
    num=num//10
print('The length of the number is:',len)


# 8. Write a python script to calculate sum of digits of a given number

num=int(input('Enter a number:\t'))
l=0
while num!=0:
    l=l+(num%10)
    num=num//10
print('The sum of the digits is:',l)


# 9. Write a python script to print binary equivalent of a given decimal number. (do not use bin() method).

# decimal to binary convert
n=int(input('Enter the number:\t'))
re=""
while n>0:
    re=re+str(n%2)
    n//=2
re=re[::-1]
print(re)


# 10. Write a python script to print the octal equivalent of a given decimal number. (do not use oct() method)

n=int(input('Enter the number:\t'))
re=""
while n>0:
    re=re+str(n%8)
    n//=8
re=re[::-1]
print(re)