In Class Lab 1(short lab) (Taken from Prof Tausner)

- a short programming project to be done in one lab session

This lab has three parts:

• First, copy the C++ program shown below, and get it to run.
• Second, experiment with the output manipulators as described below.
• Third, modify the program as described below.

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// Programmer: type your name here
// Date completed: type today's date
// Program to obtain a decimal number from the user and
// and display the number squared and to the 3rd power.

#include <iostream>
#include <iomanip>
using namespace std;

int main ( )
{

double num; // decimal number variable
double numsq; // will hold number squared
double num_3rd; // will hold number cubed


// Obtain a decimal number
cout << "Please type a decimal number: " ;
cin >> num;

numsq = num * num; // compute num squared
num_3rd = numsq * num; // compute num to the 3rd power

// Display the results
cout << fixed << setprecision(2);
cout << setw(40) << left << "The number = " << num << endl;
cout << setw(40) << left << " The number squared = " << numsq << endl;
cout << setw(40) << left << " The number cubed = " << num_3rd << endl;
cout << endl;

return 0;
}

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After the program successfully runs, experiment with it as described here:

1. delete the fixed manipulator and run the program again. What happens?
2. put the deleted manipulator(s) back into the program, delete the setprecision manipulator and run the program again. What happens?
3. put the deleted manipulator(s) back into the program, delete the setw manipulator and run the program again. What happens?
4. put the deleted manipulator(s) back into the program, delete the left manipulator and run the program again. What happens?
5. put all manipulators back into the program, and continue by modifying the program as described below

Add the following to the program

6. Declare 3 additional double variables to hold
• num to the 4th power (i.e. num⁴ )
• num to the 5th power (i.e. num⁵ )
• num to the 6th power (i.e. num⁶ )

Give these new variables meaningful names.

1. Add statements to compute these 3 additional values. Each should be computed using only one multiplication.
   For example,
              num⁴ can be computed by multiplying num_3rd by num or by multiplying numsq by numsq
   Figure out how you will compute num⁵ and num⁶
2. Then output the values computed with appropriate messages telling what is being printed.
3. Add and/or change comments to match the updated program.

Here is an example of the results you will get:
Assume the number input is 5
then      number squared will equal 25.00
             number cubed will equal 125.00
             number⁴ will equal 625.00
             number⁵ will equal 3125.00
             number⁶ will equal 15625.00