Author Archives: carlos green

#TC1017 #QUIZ09

This program will print out the fibonacci series of a number given by the user. In order to make this program better, it should print out all the fibonnacci values until geting the one the user entered. Here is an example:

fibonacci of 10:
1, 1, 2, 3, 5, 8, 13, 21, 34, 55
the 10th value of your number in the fibonacci series is: 55.

In order to do this, we will need 4 variables:

• long a=1;
• long b=0;
• long fibo;
• long value;

For this program to work, frist, lets remember how fibonacci works…  photo by: http://en.wikipedia.org/wiki/Recurrence_relation

In order to follow this mathematical formula, we will use a “for” loop, that sums our variables a and b (fibo= a+b) after giving “a” the value of “b” and “b” the value of “fibo” for many times. 

Here is how the loop should look:

for(int i=0; i<value; i++){

  fibo=a+b;

  a=b;

  b=fibo;

  cout<<fibo<<endl;

 }

Remember that the variable “i” in the loop, will work until its equal  or bigger than the initian value. 

The (cout<<fibo<<endl;) part inside the loop, is created in order to print out all values of the fibonacci series until it gets the one given by the user.

After creating this loop, you only have to print out “fibo” which will work as your result.

Here is a picture of how the program should run:

#TC1017 #QUIZ09 

Here is how to do exponentiation asking the user for two numbers:

The program should ask the user for two numbers “a” and “b”, and then, raise “a” to the power of “b”. In order to do this, we will be using 4 variables:

• long a;
• long b;
• long power=1;
• long counter=0; 

We will be using a “do, while” loop, therefore, we need a variable to use as a counter and asign to it the value of 0. 
After asking the user for both numbers a and b, you will create a “do while” loop that works (while counter < b), because we will need the loop to work until we get to the value of b.

Lets remember the formula for exponentiation:   photo by:  http://en.wikipedia.org/wiki/Exponentiation

Our do while loop, will multiply “a”, “b” times, which means that the loop should multiply “a x a” as many times as the variable “b” states.

Here is how it should look:

  do{

power=power*a;

counter=counter+1;

       }while(counter < b); 

After that you can print out the new value of your variable “power” in order to show your result. 

Here is a picture of the code and how it should run:

#TC1017 #QUIZ09 

Here is a code to make a triangle with a “char”  or one string.  The program itself, is able to print one character by just asking the user for the number of rows.
For this program you need:

• 4 variables:
• 1-> string T= “T”;
• 2-> int rows, cols, norows;

where norows are the number of rows you will ask for, to the user. 
Now that we have our variables, it is also important to use the correct libraries. In this case we used:

• <iostream>
• <sstream>

In order to make the program, we will use nested “for” loops, where the first loop, will have our variable “rows”,  and “norows”, and the nested one (second one) will have our variables “cols” and “rows”. The first loop should work by asigning the value “1” to cols, then, our conditional will be that “rows” has to be smaller than ” therefore, rows++. The second loop will look like this: for (cols=1; cols<=rows; cols++).

inside the second loop, we will print out our variable T, and then, inside the first loop we will print <<endl; <– to separate each string.

After this step, the program should print a triangle like this:

T
TT
TTT
TTTT
TTTTT

 In order to complete the final triangle, we will have to do 2 “for” nested loops again, but this time, make it backwards.
These loops should look like: 

for(rows=norows-1; rows>0; rows–){

  for(cols=1; cols<rows; cols++){

  cout<<T;
               }

   cout<<endl;

}

Here is a picture of the code and how it should run: