Hello people, I was busy for a long time but here I am. This post is about my first quiz of the second partial of the semester. It was not too difficult but I got in trouble with some parts of the code but I finally did it. Well, the instructions for the quiz were:

Create a function called euler_calc with a single parameter precision. The value of precision is used to determine when to stop calculating. Your calculation will stop when the two consecutive values estimating e differ by less than precision (remember to use absolute value when calculating the difference between two values here).

I search information on Wikipedia about the Euler number to get the idea, and I found interesting information about it: The number e is an important mathematical constant that is the base of the natural logarithm. It is approximately equal to 2.71828,[1] and is the limit of (1 + 1/n)n as n approaches infinity, an expression that arises in the study of compound interest. It can also be calculated as the sum of the infinite series.

Thanks Euler for doing our life easier and harder at the same time.

Here the code of my program.

The new thing here was the SET PRECISION function that I used to call to the user for the number of decimals that he wants to use.

It has to look like that:

#include <iomanip>      // std::setprecision

int main () {
  double f =3.14159;
  std::cout << std::setprecision(5) << f << 'n';
  std::cout << std::setprecision(9) << f << 'n';
  std::cout << std::fixed;
  std::cout << std::setprecision(5) << f << 'n';
  std::cout << std::setprecision(9) << f << 'n';
  return 0;
}

**Don't forget to use the iomanip library to run it without problem.

And the program running:




 Continue reading "Quiz 4 Euler Number" →

Simplicity is the ultimate sophistication.DaVinci

Hello people. I made my third and the last one of the first partial. We have to create two programs: the first program, may calculate the distance between two points (x1,y1) & (x2,y2). In the second one, we have to create the Fibonacci sequence on C++ and ask to the user for the value that he/she wants. To make that, we use our previous knowledge about it, like conditionals, loops, functions, etc. so it wasn’t difficult.

The instructions were:

1. Write a function called distance(x1, y1, x2, y2) which receives four numbers which represent two points in the cartesian plane. The function should return the distance between the two points (x1,y1) and (x2,y2). Remember that the square of the hypotenuse of a right angle triangle is equal to the sum of the squares of the two other sides. Also, don’t forget to declare the variables with FLOAT to use decimal numbers.

**The new thing here, was the use of the math library, to can execute the square (SQRT in C++). The math library is using like this:

#include <cmath>

And now you can use the formula of the Pitagoras Theorem :

Distance= sqrt((x2-x1)^2+(y2-y1)^2)

Here my code with comments to make it understandable.

And the program running:

2. Write a function called fibonacci which receives a single parameter “n” (a non-negative integer) and returns the nth number in the fibonacci series which is: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89………… So, fibonacci(0) would return 0. fibonacci(5) would return 5 fibonacci(8) would return 21. Note that the first two fibonacci numbers are 0 and 1. All others are the sum of the previous two fibonacci numbers. int fibonacci(int n){ }

Here I got a headache with the Fibonacci Formula, but once

Continue reading “Quiz 3” →

Hello my friends. I had to mention that we made this quiz some weeks ago, and here is my post about it. I fell nervous when we made the quiz, but after doing my WSQ09 I learned how to use the for Loop and it safe my life. Also lynda (A platform where you can search for information about everything -www.lynda.com-). And if you want to learn more, I suggest to visit this page who helps a lot with C++ (and obviusly to make the programs of this quiz) http://www.cplusplus.com/doc/tutorial/control/ ; on this link, you can find useful information about the loops, who are always necesary, and here another link to understand the functions (I have to read it sometimes because I really get in trouble with it, but now I’m a master on functions ;D). The links:

http://www.lynda.com/C-tutorials/Creating-user-defined-functions/167922/181569-4.html

http://www.cplusplus.com/doc/tutorial/functions/

But well, let’s go to the important think, the quiz.

The instructions were:

1. Create a program with the following function. Write a function called superpower that has receives two parameters (ints) and returns an integer which is first parameter raised to the power of the second, which is to say it returns a b . There are many ways to do this, but the intent is for you to use a loop or recursion.

So to do that, at first, we have to use the function SUPERPOWER and inside of it, we have to do the operation (a^b) -I had a headache doing that- because it wasn’t too difficult but i had my for loop wrong so I had to start again and make it functional. So, here my code with some comments to make it easier.

And the exe.

2. Create a program with the following function. Write a function called

Continue reading “Challenge accepted, Quiz 2.” →

Hello people! I made my first quiz of the class and it was not difficult. It was about the topics that we saw before so I did it so fast.

I felt nervous when Ken gave us the quiz, but after read it I made it without problem. It consists in three programs:

1. Make a program that calculates the volume of a cylinder.
2. Make a program that does basic arithmetic operations.
3. The same as the second but using float (Float uses the numbers with decimals)

Here we used a new command (FLOAT) that is necessary when you want to use decimals numbers on your operations. You have to declare your variables with Float at the begin.

Also I learnt a new command that helps you to separate the message you’re printing to the user. It was (n) and you have to put in the begin of the line that you’re going to print on the board.

For example:

cout<<“Hi my name’s Eduardo.”;

cout<<“nI’m happy with my Flipped Learning.”;

And that runs like that:

Hi, my name’s Eduardo.

I’m happy with My Flipped Learning.

 

And here the screenshot of my programs.

1. Here we ask to the user for the radius and the height of the cylinder, and then, the program do the operation. Remember that we have to declare the variable PI(3.1416) using the command FLOAT to use decimals numbers.

The screenshots:

Running:

2)On this program (It’s the same that the WSQ03 Fun with numbers) we make basic arithmetic operations asking to the user for 2 differents numbers and then make the product, the division and the remainder of the last. Remember that we are using integers numbers so we have to use the command INT.

The screenshots:

Running:

3) On the last program, we

Continue reading “Quiz time, not really bad.” →