Chapter 6, Problem 4PE

Program Plan Intro

Calculate the sum of first n natural numbers and sum of cubes of first n natural numbers

Program plan:

• The function named “sumN()” is defined and inside the “sumN()”,
  • Declare and initialize the variable named “fact” and store the calculated area value in it.
  • Initialize a for loop which ranges from 1 to -1
    • Add the value of factor to fact.
    • Return the value stored in the “fact” variable.
• The function named “sumNCubes()” is defined and inside the “sumNCubes()”,
  • Declare and initialize the variable named “cube” and store the calculated area value in it.
  • Initialize a for loop which ranges from 1 to -1
    • Multiply the value of factor with 3 and then add that value to “cube”.
    • Return the value stored in the “cube” variable.
• In the “main()” function,
  • Generate a prompt to take the user input.
  • Call the method named “sumN()” with user input as the argument.
  • Call the method named “sumNCubes()” with user input as the argument.
• Print the output statement and output value.
• Call the function “main()”.