C++ help please :)

[Soybomb]

Okay I spent like 4 hours on this last night and its still not working out for me, so any help you guys can give me would be greatly appreciated.

I'm trying to make a program that will take a odd interget as input and through the use of nested loops make a christmas tree design. All my asterisks must be printed by a single instance of cout<<"*";

l
here is my code so far, please excust how sloppy it is now

i've got it printing out the right number of lines, but if I could just figure out how to write a loop that would make it print the right number of asterisks on each line I could figure out the spaces and formatting myself i think

#include <iostream>
using namespace std;

int main() {

int width;
int blanks;
int quotient;
int product;
int result;
int rows;
int counterw;
int ast;
int rownumber;
int nextline;
int number;

cout << "Enter the width of the base of the tree and press enter.\n";
cin >> width;

counterw = 1;
ast = 1;
number = 1;
nextline = ast;
rows = (width/2) + 1;
rownumber = 1;
blanks = width / 2;

quotient = width / 2;
product = quotient * 2;
result = width - product;

if (result == 0 || width==0 || width >= 80) {
cout << "The number entered was not odd, was 0, or was greater than 80, and a tree will not be drawn. \n";
}
else
cout << "*";
cout << "\n";
while (rows > 1) {
while (ast >=2 ) {
cout << "*";
ast--;
}
nextline = nextline +2;
rows--;
cout << "\n";


}










return EXIT_SUCCESS;
}

 

[iamwiz82]

i had to do a program like this in java for a test. I believe you need 3 nested for loops, one to one for the left side spaces, one for the right side spaces, and one for the astericks. I cant remember how i did it though.

 

[notfred]

for(int i = width;i>0;i--){
for(int j = 0; j<=i;<j++){
cout << "*";
}
cout << "\n";
}

Something like that? that's all it looks like you're trying to do.

 

[doublec16]

What is the output of your program as it is now?

 

[crystal]

I think there is a command in c/c++ where you in a number and letter, symbol, etc. and it will make that many copies. It is been ages since I touch c/c++.

 

[Soybomb]

With the input of 5 it give me a
*
blank
blank

Okay notfred, I just checked out that chunk of code and get syntax errors on the second for line for "missing '(' before '<'". To my knowledge that looks like the correct structure

 

[notfred]

oops, typo

there should be no '<' before the j++

edit:

I changed my code to:

for(int i = 0;i<width;i++){
for(int j = 0; j<=i;j++){
cout << "*";
}
cout << "\n";
}

cause the tree was printing upside down.

when I had a tree base width of 15, it printed out the tree 7 times... dont know what's up with that, but it worked.

 

[Soybomb]

Nevermind I see you beat me to it

I'm gonna try to tweak it now for it prints the right number of rows and stars per row....i hate nested stuff

 

[iamwiz82]

now, make one that is the exact opposite of fred's and place it in front of the code you already have.

 

[notfred]

ugh... be glad you're not writing assembly....

 

[Soybomb]

Lol I know this is about all the prgramming fun I can stand for a while

Alright, I think I'm still a little lost, how can I convince it to print the number of rows I have defined, or for that matter add two asterisks to each line it prints instead of one? I'm coming out with some really nasty looking stufff

edit: WAIT WAIT!! !I Got the right number of rows...now to get asterisks...

 

[notfred]

if you want it to print two asteriksa instead of one, change: cout << "*"; to: cout << "**";

the number of rows it prints is defined by the number of values in (int i = 0;i<width;i++)

if you want it to print more rows, make width bigger, if you want it to print fewer rows, make width smaller.

 

[Soybomb]

Actually I changed it to
for(int i = 0;i<rows;i++){
for(int j = 0; j<=i;j++){
cout << "*";
}
cout << "\n";
}
for the right number of rows, but I'm still fighting asterisks.

I also can't put in cout<<"**"; because we can only use cout <<"*"; and it would also ruin the first line

I think this homework has taken too long..perhpas I shall just skip

 

[notfred]

.globl main
.text
main: addi $v0, $zero, 4
la $a0, ask
syscall
addi $v0, $zero, 5
syscall
add $s1, $zero, $v0

addi $v0, $zero, 4
la $a0, ask2
syscall
addi $v0, $zero, 5
syscall
add $s2, $zero, $v0

addi $v0, $zero, 4
la $a0, ask3
syscall
addi $v0, $zero, 5
syscall
add $s3, $zero, $v0


slt $t1, $s1, $s2
beq $t1, $zero, next
slt $t2, $s2, $s3
beq $t2, $zero, next
add $s1, $zero, $zero
j end

next: slt $t1, $s2, $s1
beq $t1, $zero, next2
slt $t2, $s2, $s3
beq $t2, $zero, next2
add $s2, $zero, $zero
j end

next2: slt $t1, $s3, $s2
beq $t1, $zero, end
slt $t2, $s3, $s1
beq $t2, $zero, end
add $s3, $zero, $zero
j end

end: addi $v0, $zero, 4
la $a0, res
syscall

add $a0, $s1, $s2
add $a0, $a0, $s3

addi $v0, $zero, 1
syscall

.data
ask: .asciiz "\nenter 1st number:"
ask2: .asciiz "\nenter 2nd number:"
ask3: .asciiz "\nenter 3rd number:"
res: .asciiz "\nresult: "





MIPS assembly - it takes 3 user inputted vales (integers) and adds up the two biggest ones... fun.

 

[Soybomb]

You broke my head

 

[notfred]

<< You broke my head >>



yeah, assembly language blows

 

[Descartes]

<< yeah, assembly language blows >>



assembly can be great, but... what you posted isn't assembly language...

[edit]correction, it could be a form of assembly language, but most likely w/ some higher level constructs used by your assembler, so it can still technically be assembly I suppose[/edit]

 

[hominid skull]

Try this for size Soyobomb..

// tree2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>

using namespace std;

void main(void)
{

int i;
int width;
int blanks;
int ast;

ast = 1;
width = 0;

cout << "Enter the width of the base of the tree and press enter.\n";
cin >> width;

blanks = (width - 1) / 2;


while (ast != width)
{
for (i=0; i<blanks; i++)
{
cout<<" ";
}
for (i=0; i<ast; i++)
{
cout<<"*";
}
for (i=0; i<blanks; i++)
{
cout<<" ";
}
cout<<"\n";
blanks = blanks - 1;
ast = ast + 2;
}
}


works a treat!

good luck

 

[hominid skull]

This is my revised version as the first had a bug that excluded the last line of asterisks, it also contains error checking of the input width.


#include "stdafx.h"
#include <iostream>

using namespace std;

void main(void)
{

int i;
int width;
int blanks;
int ast;

ast = 1;
width = 0;

cout << "Enter the width of the base of the tree and press enter.\n";
cin >> width;

blanks = (width - 1) / 2;


if (width <=79 && width % 2 == 1 && width >0)
{
while (ast <= width)
{
for (i=0; i<blanks; i++)
{
cout<<" ";
}
for (i=0; i<ast; i++)
{
cout<<"*";
}
for (i=0; i<blanks; i++)
{
cout<<" ";
}
cout<<"\n";
blanks = blanks - 1;
ast = ast + 2;
}
}
else
{
if (width >79)
{
cout<<"the number was greater than 79\n";
}
if (width % 2 ==0)
{
cout<<"the number was even\n";
}
if (width < 0)
{
cout<<"the number was lest than 0\n";
}
}
}