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**Write a program to compute the area and volume of a sphere whose radius is entered by the user. Use functions to compute area and volume.**

#Area and volume of a sphere #Author: Mukesh N Tekwani #Function to compute the area of a sphere #Input parameter: radius r def Area(r): a = 4 * 3.142 * r * r return a #returns area # End of function #Function to compute the volume of a sphere #Input parameter: radius r def Volume(r): v = 4/3 * 3.142 * r * r * r return v #returns volume # End of function #Take input rad = int(input("Please enter the radius of the sphere ")) #Store area in variable ar ar = Area(rad) #Now use the value in ar to print area print("Area = ", ar) #Call the function Volume from print function print ("Volume = ", Volume(rad)) #EndOfProgram

**Write a program to reverse a string and check if it is a palindrome.**

#Simple trick to reverse a string str = "debug" #declare string revstr = str[::-1] print("Reversed string is ", revstr) #Now check if str is palindromic #words which remain the same when spelt backwards are called palindromes #E.g. madam, noon, radar, refer, stats if str == revstr: print(str, " is a palindrome") else: print(str, " is not a palindrome") #EndOfProgram

**Write a program to compute the factorial of a number entered by the user. **

#Factorial of a number def factorial(n): f = 1 for i in range(1, n+1): f = f * i print ("Factorial = ", f) #EO Function - end of function. It helps to put this comment at #the end of a function to know where a function has ended. #The braces { and } in C, C++ #and Java were useful in that #sense to identify a block of code. n = int(input("Enter a no. ")) factorial(n) # call the function #EndOfProgram

**Write a program to count the number of digits in an integer.**

#To count the digits in a number #E.g., Input 2387, output : 4 #input 23986, output 5 num = int(input('Enter a number ')) ctr = 0 # to keep a count of digits in the given number while num > 0: r = num % 10 #% operator gives remainder after division by 10 ctr = ctr + 1 num = num // 10 #truncate the given number as last digit is used #EOWhileLoop This comment helps to identify the end of a loop print ("There are ", ctr, " digits in that number") #EndOfProgram

**Write a program to create complex numbers and perform addition and subtraction on these numbers.**

#Complex numbers representation #Author : Mukesh N Tekwani #Create a complex no with real part 2 and imaginary part 3 #Complex number is denoted in the form a + ib #a and b are real numbers and i is square root of -1 (imaginary) x = complex(2,3) print (type(x)) #print type of variable x print (x) #print value of x y = complex(4, 2) print (y) z = x + y #add the two complex numbers print (z) d = x - y #difference of two complex numbers print (d) #End of program

**Write a program to compute and print the first 10 Fibonacci numbers.**

#Fibonacci numbers #Author : Mukesh N Tekwani a = 1 b = 1 ctr = 2 print (a, end = ' ') #end = ' ' means print value of a & stay on same line print (b, end = ' ') while ctr < 10: sum = a + b print (sum, end = ' ') ctr += 1 a = b b = sum #EOWhileLoop #End of program

**Write a program to check if a number entered by the user is a prime number.**

#Prime number check #Author : Mukesh N Tekwani #Function to check if a number entered by the user is a Prime number #A prime number is one that is divisible only by 1 and itself. # 5, 11, 29 are prime numbers but 6, 45, 216 are not prime numbers def IsPrime(n): flag = 0 for i in range(2, n): if (n % i) == 0: flag = 1 break #End of if stmt # End of for loop if flag == 1: return False else: return True # End of function n = int(input("Pls enter a number ")) if IsPrime(n): print (n, " is a Prime number") else: print (n, " is not a Prime number") #End of if stmt #EO Program