Help to understand the program

[pavel]

2) Write a simple C++ program that inputs a positive integer n and then prints
2n -1 lines of asterisks with width increased from 1 through 2n -1 asterisks
then decreased back to 1 in a way to form a parallelogram. For example,
if the input is 5 then the output should be


*
***
*****
*******
*********
*******
*****
***
*

[Chris McGinlay]

pavel wrote:

>
> 2) Write a simple C++ program that inputs a positive integer n and then
> prints 2n -1 lines of asterisks with width increased from 1 through 2n -1
> asterisks
> then decreased back to 1 in a way to form a parallelogram. For example,
> if the input is 5 then the output should be
>
>
> *
> ***
> *****
> *******
> *********
> *******
> *****
> ***
> *

To get you started:

int main()
{
int n=0;
std::cout << "Please enter n \n";
std::cin >> n;

//wax
for (int i=1; i <= 2*n-1; i+=2)
{
for (int k=1; k <= i; k++) std::cout << "*";
std::cout << std::endl;
}

//wane
//TODO

return 0;
}

--
www.ascent.zetnet.co.uk
Standards Compliant Web Design

[Dennis]

Chris McGinlay <ascent@zetnet.co.uk> wrote:
>pavel wrote:
>
>>
>> 2) Write a simple C++ program that inputs a positive integer n and
then
>> prints 2n -1 lines of asterisks with width increased from 1 through 2n
-1
>> asterisks
>> then decreased back to 1 in a way to form a parallelogram. For example,
>> if the input is 5 then the output should be
>>
>>
>> *
>> ***
>> *****
>> *******
>> *********
>> *******
>> *****
>> ***
>> *
>
>To get you started:
>
>int main()
>{
> int n=0;
> std::cout << "Please enter n \n";
> std::cin >> n;
>
> //wax
> for (int i=1; i <= 2*n-1; i+=2)
> {
> for (int k=1; k <= i; k++) std::cout << "*";
> std::cout << std::endl;
> }
>
> //wane
> //TODO
>
> return 0;
>}
>
>--
>www.ascent.zetnet.co.uk
>Standards Compliant Web Design

[Dennis]

Chris McGinlay <ascent@zetnet.co.uk> wrote:
>pavel wrote:
>
>>
>> 2) Write a simple C++ program that inputs a positive integer n and
then
>> prints 2n -1 lines of asterisks with width increased from 1 through 2n
-1
>> asterisks
>> then decreased back to 1 in a way to form a parallelogram. For example,
>> if the input is 5 then the output should be
>>
>>
>> *
>> ***
>> *****
>> *******
>> *********
>> *******
>> *****
>> ***
>> *
>
>To get you started:
>
>int main()
>{
> int n=0;
> std::cout << "Please enter n \n";
> std::cin >> n;
>
> //wax
> for (int i=1; i <= 2*n-1; i+=2)
> {
> for (int k=1; k <= i; k++) std::cout << "*";
> std::cout << std::endl;
> }
>
> //wane
> //TODO
>
> return 0;
>}
>
>--
>www.ascent.zetnet.co.uk
>Standards Compliant Web Design

The second for loop could look like the following... but try to use your
own otherwise you will never be what you want to be...

for (int j = 1; j < n; j++)
{
cout << setw(2 * j + 1);
for (int k = (2 * n - 1) - (2 * j); k > 0; k--)
cout << "*";
cout << endl;
}