List of loop programming exercises
1) Write a
Python program to print all natural numbers from 1 to n. - using
while or for loop.Answer :
#Using for loop
for i in range(1,11,1):
print(i,end=" ")
#Using while loop
print()
i=1
while(i<11):
print(i,end=" ")
i=i+1
2) Write a Python program to print all natural numbers in reverse (from n to 1). - using while or for loop.
Answer:
#Using for loop
n=int(input("Enter the limit to print all natural numbers :"))
for i in range(n,0,-1):
print(i,end=" ")
#Using while loop
print()
while(n>=1):
print(n,end=" ")
n=n-1
3) Write a Python program to print all alphabets from a to z. - using while or for loop.
Answer:
#Using for loop
for i in range(65,91,1):
print(chr(i),"->",i)
#Using while loop
print()
i=65
while(i<=90):
print(chr(i),"->",i)
i=i+1
4) Write a Python program to print all even numbers between 1 to 100. - using while or for loop
Answer:
#Using for loop
for i in range(0,101,2):
print(i,end=",")
#Using while loop
print()
i=2
while(i<=100):
print(i,end=",")
i=i+2
5) Write a Python program to print all odd number between 1 to 100.
Answer:
#Using for loop
for i in range(1,100,2):
print(i,end=",")
#Using while loop
print()
i=1
while(i<=100):
print(i,end=",")
i=i+2
6) Write a Python program to find sum of all natural numbers between 1 to n.
Answer:
#Using for loop
n=int(input("Enter the limit : "))
s=0
for i in range(1,n+1,1):
print(i,end=",")
s=s+i
print("Sum=",s)
#Using while loop
print()
n=int(input("Enter the limit : "))
s=0
i=1
while(i<=n):
print(i,end=",")
s=s+i
i=i+1
print("Sum=",s)
7) Write a Python program to find sum of all even numbers between 1 to n.
Answer :
#Using for loop
n=int(input("Enter the limit : "))
s=0
for i in range(2,n+1,2):
print(i,end=",")
s=s+i
print("Sum=",s)
#Using while loop
print()
n=int(input("Enter the limit : "))
s=0
i=2
while(i<=n):
print(i,end=",")
s=s+i
i=i+2
print("Sum=",s)
8) Write a Python program to find sum of all odd numbers between 1 to n.
Answer :
#Using for loop
n=int(input("Enter the limit : "))
s=0
for i in range(1,n+1,2):
print(i,end=",")
s=s+i
print("Sum=",s)
#Using while loop
print()
n=int(input("Enter the limit : "))
s=0
i=1
while(i<=n):
print(i,end=",")
s=s+i
i=i+2
print("Sum=",s)
9) Write a Python program to print multiplication table of any number.
Answer :
#Using for loop
n=int(input("Enter the limit : "))
t=1
for i in range(1,11,1):
print(i,'x',n,'=',i*n)
#Using while loop
print()
n=int(input("Enter the limit : "))
i=1
while(i<=10):
print(i,'x',n,'=',i*n)
i=i+1
10) Write a Python program to count number of digits in a number.
Input
Enter a number : 3457
Output
Count of digits : 4
Answer :
n=int(input("Enter the number: "))
rem=count=sum1=0
while(n>0):
rem=n%10
n=n//10
count=count+1
print("Count of digits :",count)
11) Write a Python program to find first and last digit of a number.
Input
Enter a number : 3457
Output
First digit = 3
Last digit = 7
Answer :
import math
n=int(input("Enter a number :"))
# Find last digit
lastDigit = n % 10
# Total number of digits - 1
digits = (int)(math.log10(n))
# Find first digit
firstDigit = (int)(n // math.pow(10, digits))
print("First digit = ", firstDigit)
print("Last digit = ", lastDigit)
12) Write a Python program to find sum of first and last digit of a number.
Input
Enter a number : 3457
Output
First digit = 3
Last digit = 7
Sum of First digit and Last digit :10
Answer
import math
n=int(input("Enter a number :"))
# Find last digit
lastDigit = n % 10
# Total number of digits - 1
digits = (int)(math.log10(n))
# Find first digit
firstDigit = (int)(n // math.pow(10, digits))
print("First digit = ", firstDigit)
print("Last digit = ", lastDigit)
s=firstDigit+lastDigit
print("Sum of First digit and Last digit :",s)
13) Write a Python program to swap first and last digits of a number.
Example :
Input
Input any number : 12345
Output
Number after swapping first and last digit : 52341
Answer :
import math
num=int(input("Enter any number: "))
# Find last digit
lastDigit= num%10
# Find total number of digit - 1
digits = (int)(math.log10(num))
# Find first digit
firstDigit = (int)(num // math.pow(10, digits))
swappedNum = lastDigit
swappedNum *= (int) (math.pow(10, digits))
swappedNum += num % ((int) (math.pow(10, digits)))
swappedNum -= lastDigit
swappedNum += firstDigit
print("Original number = ", num)
print("Number after swapping first and last digit: ", swappedNum)
14) Write a Python program to calculate sum of digits of a number.
Example : 235=2+3+5=10 # sum of digits
Answer :
n=int(input("Enter any number :"))
s=r=0
while(n>0):
r=n%10
s=s+r
n=n//10
print("The sum of digits :",s)
15) Write a Python program to calculate product of digits of a number.
Example : 235=2*3*5=30 # sum of digits
Answer :
n=int(input("Enter any number :"))
r=0
s=1
while(n>0):
r=n%10
s=s*r
n=n//10
print("The sum of digits :",s)
16) Write a Python program to enter a number and print its reverse.
Example :
Input
Input any number : 12345
Output
The Reverse number is : 54321
Answer:
n=int(input("Enter any number :"))
s=r=0
while(n>0):
r=n%10
s=s*10+r
n=n//10
print("The Reverse number is :",s)
17) Write a Python program to check whether a number is Armstrong or not.
Example : 153=1*1*1+5*5*5+3*3*3 # 153 is an Armstrong number.
Answer:
n=int(input("Enter any number :"))
r=s=0
m=n
while(n>0):
r=n%10
s=s+r**3
n=n//10
if(m==s):
print(m, " is armstrong number.")
else:
print(m, " is not armstrong number.")
18) Write a Python program to enter a number and print it in words.
Input
Enter any number to print in words: 3462
Output
Three Four Six Two
Answer:
import math
n=int(input("Enter any number to print in words: "))
##Store reverse of n in num
num=0
#Find total digits in n
digits = (int) (math.log10(n))
while(n != 0):
num = (num * 10) + (n % 10)
n //= 10
#Find total trailing zeros
digits = digits - (int) (math.log10(num))
#Extract last digit of number and print corresponding digit in words till num becomes 0
while(num!=0):
rem=num % 10
if (rem==0):
print("Zero ",end='')
if (rem==1):
print("One ",end='')
if (rem==2):
print("Two ",end='')
if (rem==3):
print("Three ",end='')
if (rem==4):
print("Four ",end='')
if (rem==5):
print("Five ",end='')
if (rem==6):
print("Six ",end='')
if (rem==7):
print("Seven ",end='')
if (rem==8):
print("Eight ",end='')
if (rem==9):
print("Nine ",end='')
num = num // 10
# all trailing zeros
while(digits):
print("Zero ")
digits=digits-1
19) Write a Python program to print all ASCII character with their values.-using for or while loop.
Answer:
#Using for loop
for i in range(0,256,1):
print(i,"->",chr(i))
#Using while loop
print()
i=0
while(i<=256):
print(i,"->",chr(i))
i=i+1
20) Write a Python program to find power of a number using for loop.
Example
Input
Input base: 2
Input exponent: 5
Output
2 ^ 5 = 32
Answer:
#Input base and exponent from user
base=int(input("Enter base: "))
exponent=int(input("Enter exponent: "))
power = 1
#Multiply base, exponent times
for i in range(1,exponent+1, 1):
power = power * base
print(base,"^", exponent,"=", power)
21) Write a Python program to find all factors of a number
Example
Input number: 12
Output
Factors of 12: 1, 2, 3, 4, 6, 12
Answer:
num=int(input("Enter any number to print Prime factors: "))
print("All Prime Factors of ",num," are: ",end="")
# Find all Prime factors
for i in range(2, num+1, 1):
# Check 'i' for factor of num
if(num%i==0):
# Check 'i' for Prime
isPrime = 1
for j in range(2, i+1//2,1):
if(i%j==0):
isPrime = 0
break
# If 'i' is Prime number and factor of num
if(isPrime==1):
print(i,end=",")
22) Write a Python program to calculate factorial of a number.
Factorial -> 5= 5*4*3*2*1=120
Example
Enter the number : 5
Output
The factorial of 5 is 120
Answer :
num=int(input("Enter the number : "))
fact=1
if (num < 0):
print("Sorry, fact does not exist for negative numbers")
elif (num == 0):
print("The fact of 0 is 1")
else:
for i in range(1,num + 1):
fact = fact*i
print("The factorial of",num,"is",fact)
23) Write a Python program to find HCF (GCD) of two numb
Input
Input first number: 12
Input second number: 30
Output
HCF of 12 and 30: 6
Answer:
num1=int(input("Enter any first number : "))
num2=int(input("Enter any second number : "))
# Find minimum between two numbers
if(num1<num2):
mx=num1
else:
mx=num2
for i in range(1, mx+1,1):
# If i is factor of both number
if(num1%i==0 and num2%i==0):
hcf = i
print("HCF of ",num1, "and",num2, "=" , hcf)
24) Write a Python program to find LCM of two numbers.
Example
Input
Enter any first number : 12
Enter any second number : 30
Output
Answer:
num1=int(input("Enter any first number : "))
num2=int(input("Enter any second number : "))
# Find maximum between num1 and num2
if(num1<num2):
mx=num1
else:
mx=num2
# First multiple to be checked
i = mx
# Run loop indefinitely till LCM is found
while(True):
if(i%num1==0 and i%num2==0):
#If 'i' divides both 'num1' and 'num2' then 'i' is the LCM.
lcm = i
# Terminate the loop after LCM is found
break
#If LCM is not found then generate next multiple of max between both numbers
i += mx
print("LCM of ",num1, "and",num2 ," = ",lcm)
25) Write a Python program to check whether a number is Prime number or not.
Example
Input any number: 17
17 is prime number
Answer:
num=int(input("Enter any number to check prime: "))
isPrime = 1
for i in range(2,num//2+1,1):
# Check divisibility of num
if(num%i==0):
# Set isPrime to 0 indicating it as composite number
isPrime = 0
# Terminate from loop
break
#If isPrime contains 1 then it is prime
if(isPrime == 1 and num > 1):
print(num," is prime number", )
else:
print(num," is composite number" )
26) Write a Python program to print all Prime numbers between 1 to n.
Input
Find prime numbers between 1 to : 20
Output
All prime numbers between 1 to 20 are: 2, 3, 5, 7, 13, 17, 19
Answer:
end=int(input("Find prime numbers between 1 to : "))
print("All prime numbers between 1 to ",end," are: ")
# Find all Prime numbers between 1 to end
for i in range(2, end+1,1):
# Assume that the current number is Prime
isPrime = 1
# Check if the current number i is prime or not
for j in range(2, i//2+1,1):
# If i is divisible by any number other than 1 and self then it is not prime number
if(i%j==0):
isPrime = 0
break
# If the number is prime then print
if(isPrime==1):
print(i,end="\t")
27) Write a Python program to find sum of all prime numbers between 1 to n.
Answer:
end=int(input("Find prime numbers between 1 to : "))
print("All prime numbers between 1 to ",end," are: ")
# Find all Prime numbers between 1 to end
s=0
for i in range(2, end+1,1):
# Assume that the current number is Prime
isPrime = 1
# Check if the current number i is prime or not
for j in range(2, i//2+1,1):
# If i is divisible by any number other than 1 and self then it is not prime number
if(i%j==0):
isPrime = 0
break
# If the number is prime then print
if(isPrime==1):
s=s+i
print(i,end="\t")
print("\nSum of all prime numbers between 1 to ",end," = ",s)
Program to find sum of prime numbers in given range
Answer:
start=int(input("Enter lower limit: "))
end=int(input("Enter upper limit: "))
sum1=0
#Find all prime numbers in given range */
for i in range(start, end+1,1):
#Check if the current number i is Prime or not */
isPrime = 1
for j in range(2, i//2+1,1):
if(i%j==0):
# 'i' is not prime */
isPrime = 0
break
# If i is Prime then add to sum1
if(isPrime==1):
sum1 += i
print("sum1 of all prime numbers between ", start," to ", end," = ", sum1)
28) Write a Python program to check whether a number is Armstrong number or not.
Answer:
What is Armstrong number?
An Armstrong number is a n-digit number that is equal to the sum of the nth power of its digits. For example -
153 = 13 + 53 + 33 = 153
Source Code
num=int(input("Enter any number to check Armstrong number: "))
sum1 = 0
# Copy the value of num for processing
Num1 = num
# Calculate sum of power of digits
while(num > 0):
# Extract the last digit
rem = num % 10
# Compute sum of power of last digit
sum1 = sum1 +rem**3
# Remove the last digit
num = num // 10
# Check for Armstrong number
if(Num1 == sum1):
print(Num1," is ARMSTRONG NUMBER.")
else:
print(Num1," is NOT ARMSTRONG NUMBER.")
29) Write a Python program to print all Armstrong numbers between 1 to n.
Answer:
limit=int(input("Enter upper limit: "))
print("Armstrong number between 1 to ",limit, " are: ", end="")
for i in range(1, limit+1,1):
sum1 = 0
# Copy the value of num for processing
num = i
# Calculate sum of power of digits
while(num > 0):
# Extract last digit
rem = num % 10
sum1 = sum1 + rem**3
# Remove the last digit
num = num // 10
# Check for Armstrong number
if(i == sum1):
print(i,end=",")
30) Write a Python program to check whether a number is Perfect number or not.
What is Perfect number?
Perfect number is a positive integer which is equal to the sum of its proper positive divisors.
For example: 6 is the first perfect number
Proper divisors of 6 are 1, 2, 3
Sum of its proper divisors = 1 + 2 + 3 = 6.
Hence 6 is a perfect number.
Answer:
num=int(input("Enter any number to check perfect number: "))
# Calculate sum of all proper divisors
sum1=0
for i in range(1, num//2+1,1):
# If i is a divisor of num
if(num%i == 0):
sum1 += i
# Check whether the sum of proper divisors is equal to num
if(sum1 == num):
print(num," is PERFECT NUMBER")
else:
print(num, " is NOT PERFECT NUMBER")
31) Write a Python program to print all Perfect numbers between 1 to n.
Answer:
limit=int(input("Enter limit number: "))
# Calculate sum of all proper divisors
sum1=j=0
for i in range(1, limit+1,1):
sum1=0
for j in range(1, i//2+1,1):
# If i is a divisor of num
if(i%j == 0):
sum1 += j
# Check whether the sum of proper divisors is equal to num
if(sum1 == i):
print(i,end=",")
…………………other source code………………………………………….
start=int(input("Enter Start number: "))
limit=int(input("Enter limit number: "))
# Calculate sum of all proper divisors
sum1=j=0
for i in range(start, limit+1,1):
sum1=0
for j in range(1, i//2+1,1):
# If i is a divisor of num
if(i%j == 0):
sum1 += j
# Check whether the sum of proper divisors is equal to num
if(sum1 == i):
print(i,end=",")
32) Write a Python program to check whether a number is Strong number or not.
What is Strong number? Strong number is a special number whose sum of factorial of digits is equal to the original number.
A strong number is one in which the factorial of the digits equals the number itself. 1, 2, 145, and 40585 are some examples of strong numbers.
For example: 145 is strong number. Since, 1! + 4! + 5! = 145
Answer:
temp=n
s=0
while n!=0:
r=n%10
f=1
for i in range(1,r+1):
f=f*i
s=s+f
n=n//10
if temp==s:
print("Strong")
else:
print("Not Strong")
33) Write a Python program to print all Strong numbers between 1 to n.
Answer:
limit=int(input("Enter limit: "))
print("All Strong numbers between 1 to",limit, " are: ", end=" ")
# Copy the value of num to a temporary variable
for i in range(1,limit+1,1):
sum1 = 0
currentValue=i
# Find sum of factorial of digits
while(currentValue > 0):
# Get last digit of num
lastDigit = currentValue % 10
# Find factorial of last digit
fact = 1
for j in range(1, lastDigit+1,1):
fact = fact * j
# Add factorial to sum
sum1 = sum1 + fact
currentValue = currentValue // 10
# Check Strong number condition
if(sum1 == i):
print(i,end=",")
34) Write a Python program to print Fibonacci series up to n terms.
The first two terms are 0 and 1. All other terms are obtained by adding the preceding two terms. This means to say the nth term is the sum of (n-1)th and (n-2)th term.
Answer:
limit=int(input("Enter the limit to print febonacci series.."))
a,b=0,1
c=0
for i in range(limit):
c=a+b
print(c,end=",")
a,b=b,c
35) Write a Python program to find one's complement of a binary number.
Ones complement of a binary number is defined as value obtained by inverting all binary bits. It is the result of swapping all 1s to 0s and all 0s to 1s.
Example
Input binary number: 01000011
Output
Ones complement: 10111100
Answer:
# one's compement
binary=input("Enter number in bit binary value :")
f=0
size=len(binary)
oneComp=""
for i in range(size):
if(binary[i]=='1'):
oneComp+='0'
elif(binary[i]=='0'):
oneComp+='1'
else:
print("Invalid input")
f=1
break
if(f==0):
print("Original binary :",binary)
print("Ones Compelement :", oneComp)
36) Write a Python program to find two's complement of a binary number.
Twos complement of an N-bit number is defined as the complement with respect to 2n. It is the result of subtracting the number from 2N, which in binary is one followed by n zeroes.
In simple words twos complement is defined as sum of ones complement of a binary number and 1.
Input
Input binary number: 01101110
Output
Twos complement: 10010010
Answer:
# twos compement
binary=input("Enter number in bit binary value :")
f=0
SIZE=len(binary)
onesComp=twosComp=""
carry=1
# Find ones complement of the binary number
for i in range(SIZE):
if(binary[i] == '1'):
onesComp+='0'
elif(binary[i] == '0'):
onesComp+='1'
#Add 1 to the ones complement
for i in range(SIZE-1, -1,-1):
if(onesComp[i]=='1' and carry == 1):
twosComp+='0'
elif(onesComp[i] =='0' and carry==1):
twosComp+='1'
carry = 0
else:
twosComp+= onesComp[i]
print("Original binary = ", binary)
print("Ones complement = ", onesComp)
print("Twos complement = ", twosComp)
37) Write a Python program to convert Binary to Octal number system.
Answer:
octalConstant = [0, 1, 10, 11, 100, 101, 110, 111]
# Input binary number from user
binary=int(input("Enter any binary number: "))
octal = 0
place= 1
# Copy original binary value to temp variable
tempBinary = binary
while(tempBinary != 0):
# Extract last three digit of binary
digit = tempBinary % 1000
# Find octal equivalent of 3 digit binary
for i in range(0,8,1):
if(octalConstant[i] == digit):
octal = (i * place) + octal
break
# Remove the last three digit of binary
tempBinary //= 1000
# Increase the place value
place *= 10
print("Original binary number = ", binary)
print("Octal number = ", octal)
38) Write a Python program to convert Binary to Decimal number system.
Answer:
import math
binary=int(input("Enter any binary number: "))
N=decimal=0
BASE=2
tempBinary = binary
while(tempBinary!=0):
# If current binary digit is 1
if(tempBinary % 10 == 1):
decimal+=math.pow(BASE,N)
N+=1
tempBinary //= 10
print("Binary number = ", binary)
print("Decimal number= ",round(decimal))
39) Write a program to input a number and check whether it is 'Magic Number' or not. Display the message accordingly.
A number is said to be a magic number if the eventual sum of digits of the number is one.
Sample Input : 55
Then, 5 + 5 = 10, 1 + 0 = 1
Sample Output: Hence, 55 is a Magic Number.
Similarly, 289 is a Magic Number.
Ans:
n=int(input("Enter no. "))
while n>9:
s=0
while n!=0:
s=s+n%10
n=n//10
n=s
if n==1:
print("Magic Number")
else:
print("Not Magic Number")
very informative sir...well done!!
ReplyDeletethank you sir
ReplyDelete