Thread: Compiling all i understand so far

I made a simple program that encompasses all of the knowledge that I feel i understand so far. There is one problem though, I tried to break it up into different blocks but after the first block it dosnt seem to move onto the next. I was wondering if someone could help me get it to read from block to block.

Code:

#include <iostream>

using namespace std;

int mult ( int x, int y );

int main()
{
    cout<<"I hope your are doing well today\n";        /*basic hello*/
}

int questioning()               /*input and if statement*/
{
    char color;

        cout<<"What is your favorite color?\n";
        cin>>color;
        cin.ignore();
        cout<<"I wonder why your favorite color is" << color << "\n";

    char reply;

        cout<<"Are you sure your favorite color isn't Lavender?  (Y or N)\n";
        cin>>reply;
        cin.ignore();
        if ( reply == 'Y' || 'y' ) {
            cout<<"Your read my mind.\n";
        }
        else if ( reply == 'N' || 'n' ) {
            cout<<"I might just download you a virus, but as a second chance you can halp me solve a problem.\n";
        }
        cin.get();
}

int gears()            /*loops*/
{
    cout<<"To help me switch gears.\n";
    cin.get();

    for ( int x = 0; x < 15; x++ ) {
        cout<<x<<endl;
    }
    cin.get();
}

int multiplecation()   /*funtions*/
{
    int x;
    int y;

    cout<<"Can you please tell me two large numbers to divide.\n";
    cin>> x >> y;
    cin.get();
    cout<<"The divident of those numbers are" << ( x / y ) <<"\n";
    cin.get();
}

int mult ( int x, int y)
{
    return ( x / y );
}

getting to switch blocks might be ahead of where im at but at the moment i am intrigued and would like to learn.

it get to the program without errors but it just wont continue and stops after
"I hope you are doing well today"
any help is appreciated. thank you

so if i change all of my

Code:

int questioning()
int gears()
//etc.

to have void infront like

Code:

void questioning()
void gear()

the program should run all the way through or do i still have to name everything off before main()

well i wasnt 100% sure on what you were saying but i did change some things around so it will run through the whole program. I also added <string> so the program will repead the full word replies when asking for the favorite color.

the new working code looks like this:

Code:

#include <iostream>
#include <string>

using namespace std;

int mult ( int x, int y );

int main()
{
    cout<<"I hope your are doing well today\n";             /*basic hello*/


               /*input and if statement*/
{
    string color;
    color = color;
        cout<<"What is your favorite color?\n";
        cin>>color;
        cin.ignore();
        cout<<"I wonder why your favorite color is:  " << color << "\n";

    char reply;

        cout<<"Are you sure your favorite color isn't Lavender?  (Y or N)\n";
        cin>>reply;
        cin.ignore();
        if ( reply == 'Y' || reply == 'y' ) {
            cout<<"Your read my mind.\n";
        }
        else if ( reply == 'N' || reply == 'n' ) {
            cout<<"I might just download you a virus, but as a second chance you can halp me solve a problem.\n";
        }
        cin.get();
}

            /*loops*/
{
    cout<<"To help me switch gears.\n";
    cin.get();

    for ( int x = 0; x < 15; x++ ) {
        cout<<x<<endl;
    }
    cin.get();
}

   /*funtions*/
{
    int x;
    int y;

    cout<<"Can you please tell me two large numbers to divide.\n";
    cin>> x >> y;
    cin.get();
    cout<<"The divident of those numbers are:   " << ( x / y ) <<"\n";
    cin.get();
}

{cout<<"THANK YOU. Your are now safe from viruses.\n";   /*basic thank you*/
}
}

int mult ( int x, int y)
{
    return ( x / y );
}

not exactly what i wanted but it works

The flow of a C++ program isn't to start at the top and work your way down. The program starts (and usually ends) in the main() function. That means that if you want something done after you print your first message, you need to specifically tell the computer to do so.

Each of your "blocks" of code (called functions) need to be called in order for the program to execute them. So, for example, in order to have your questioning functioning do its thing, you need to call it like so:

Code:

int main()
{
    cout<<"I hope your are doing well today\n";        /*basic hello*/
    questioning();
}

Functions can be called from any block of code - you can have gears() called from main(), or from questioning().

Now, there are two other things you need to do. First, you need to declare your functions before main(). You did this for your mult() function. For your questioning() function, the first line in your definition is:

Code:

int questioning()

You need to add that line (followed by a semi-colon) before your main() function. This tells the compiler that you have a function, called questioning, that takes no parameters, and returns an int, and that this function is defined later (that is, after main()). But here's the other part: your questioning() function does not return an int. When a function doesn't return anything, you need to declare it as returning type void. Now your function prototype looks like this:

Code:

void questioning();

Originally Posted by Mostly Harmless

Now, there are two other things you need to do. First, you need to declare your functions before main(). You did this for your mult() function. For your questioning() function, the first line in your definition is:

Code:

int questioning()

You need to add that line (followed by a semi-colon) before your main() function. This tells the compiler that you have a function, called questioning, that takes no parameters, and returns an int, and that this function is defined later (that is, after main()). But here's the other part: your questioning() function does not return an int. When a function doesn't return anything, you need to declare it as returning type void. Now your function prototype looks like this:

Code:

void questioning();

What this person is saying - in a nutshell, is that functions generally have what are called 'declarations' at the top of the file to let the compiler know a little about the function - most importantly, that it exists. Functions can be 'defined' at the same time they are declared, but they can also be defined anywhere.