Need help with void function please!

[bknick24]

Ultimately, I am trying to get this to display a rocket using the void function making two triangles and three rectangles using the "*" character but I can't seem to get the void triangle to work. I am getting a invalid function declaration, does anyone have an idea to help me fix this so that I can get this to output correctly?

#include<cmath>
#include<string>
#include <iostream>

using namespace std;
void triangle;

int main()
{
    triangle;
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

void triangle
{

cout <<"  *   "<<endl;
cout <<" * *  "<<endl;
cout <<"*   * "<<endl;
}

[1v5E3TCk]

it must be like that:

#include<cmath>
#include<string>
#include <iostream>

using namespace std;
void triangle();

int main()
{
    triangle();
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

void triangle()
{

cout <<"  *   "<<endl;
cout <<" * *  "<<endl;
cout <<"*   * "<<endl;
}

dont forget to put "()" after the name of function when you declare, define or call it

[Josue Molina]

In both line 10 and line 16, write () after triangle.

[bknick24]

Thanks guys! I may post again later if I have anymore trouble finishing it

[bknick24]

Ok, I am stumped now.. For the second part of this program I have to ask the user to enter in a symbol to make a second rocket, and I will show you what I have so far... It came up with a bunch of errors that I can't figure out at all. If anyone could help me out it would be extremely appreciated. Thank you here is my code:

#include<cmath>
#include<string>
#include <iostream>

using namespace std;
void triangle();
void rectangle();
void rocket(char);

int main()
{
    triangle();
    rectangle();
    rectangle();
    rectangle();
    triangle();
    
    char sym;
    
    cout<<"Enter in a symbol: "<<;
    cin>>sym>>;
    
    rocket(sym);
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

void triangle()
{

cout <<"  *   "<<endl;
cout <<" * *  "<<endl;
cout <<"*   * "<<endl;
}

void rectangle()
{
cout <<"*****"<<endl;
cout <<"*   *"<<endl;
cout <<"*   *"<<endl;
cout <<"*****"<<endl;
}

void rocket(char sym)
{
     cout << "3-2-1-Blast off!! " << sym << endl;
     
     cout <<  sym   <<endl;
     cout << sym<< sym<<  <<endl;
     cout <<sym<<   sym<< <<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<   <<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<  sym   <<endl;
     cout << sym<< sym<<  <<endl;
     cout <<sym<<   sym<< <<endl;
}     

[Uk Marine]

hey, seems like you don't quiet understand the concept of functions, here take a quick look at this tutorial:
http://www.cprogramming.com/tutorial/lesson4.html

bye :)

[Chervil]

There are lots of errors in the cin and cout statements.

In main(),

    cout<<"Enter in a symbol: "<<;
    cin>>sym>>;

should be:

    cout<<"Enter in a symbol: ";
    cin>>sym;

Further down the code there are lines like this:

     cout <<sym<<   sym<< <<endl;

there, you are asking the program to output something, but didn't specify what:

     cout <<sym<<   sym<< "what do you want here?" <<endl;

If you want a space, then put ' ',
or if you want several spaces, then put "      " etc.

[bknick24]

Thanks, I found where a lot of my errors were. I got everything simplified down to just one error in line 21.. It says it expected a primary expression before ";" in line 21. Does anyone see where I went wrong with this now?

Thanks again

#include<cmath>
#include<string>
#include <iostream>

using namespace std;
void triangle();
void rectangle();
void rocket(char);

int main()
{
    triangle();
    rectangle();
    rectangle();
    rectangle();
    triangle();
    
    char sym;
    
    cout<<"Enter in a symbol: ";
    cin>>sym>>;
    
    rocket(sym);
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

void triangle()
{

cout <<"  *   "<<endl;
cout <<" * *  "<<endl;
cout <<"*   * "<<endl;
}

void rectangle()
{
cout <<"*****"<<endl;
cout <<"*   *"<<endl;
cout <<"*   *"<<endl;
cout <<"*****"<<endl;
}

void rocket(char sym)
{
     cout << "3-2-1-Blast off!! " << sym << endl;
     
     cout <<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<sym<<sym<<sym<<endl;
     cout <<sym<<endl;
     cout <<sym<<sym<<endl;
     cout <<sym<<sym<<endl;
}     

[Chervil]

Line 21 I covered in my previous post, but here it is again:

  cin>>sym>>;

Change to:

  cin>>sym;

[Chriscpp]

Use whatever character you want :)

#include<iostream>
#include<iomanip>
using namespace std;
void triangle(char);
void rectangle(char);
int main()
{
char sym;
cout<<"Enter in a symbol: ";
cin>>sym;
triangle(sym);
rectangle(sym);
rectangle(sym);
rectangle(sym);
triangle(sym);
return 0;
}
void triangle(char s)
{
int x=3;
cout<<setw(x)<<s<<endl;
    for(int i=1;i<x;i++)
    {
        cout<<setw(x-i)<<s;
        cout<<setw(i*2)<<s<<endl;
    }
}
void rectangle(char s)
{
    for(int a=0;a<5;a++)
    cout<<s;
    for(int b=0;b<2;b++)
    cout<<endl<<s<<setw(4)<<s;
    cout<<endl;
    for(int c=0;c<5;c++)
    cout<<s;
    cout<<endl;
}