C++ Function Trouble(I'm having trouble with my program).

dmb2140 · #1 23-Nov-2007, 21:42

C++,CPP

I'm having trouble tripleing my out put. The program works, but I'm having trouble figuring out how to triple the out put. I do have a function listed in my program as void triple(int & number_used), but it doesn't seem to effect the program at all. I need some help with this function. So far my out put looks like this.
Enter up to 10 nonnegative numbers.
Mark the end of list with neg number
1
2
3
4
5
Array Values ......
1 2 3 4 5 Press any key to continue . . .

I need help or guidence with getting the out put to triple its out put as in...
Enter up to 10 nonnegative numbers.
Mark the end of list with neg number
1
2
3
4
5
Array Values ......
3 6 9 12 15 Press any key to continue . . .

Here is my c++ code in cpp format.
C++,CPP

CPP / C++ / C Code:

#include <iostream>

void triple(int& number_used);
void fill_array(int a[], int size, int& number_used);


int main ()
{
    using namespace std;       
    int sample_array[5], number_used;    
    fill_array(sample_array, 5, number_used);      
        cout << "The array values are:\n";    
    for (int index = 0; index < number_used; index++)       
        cout << sample_array[index] << " ";    
        cout << endl;   
    system("pause");
    return 0;
}

void triple(int & number_used)
{
    number_used *= 3;
}


void fill_array(int a[], int size, int& number_used)
{    
    using namespace std;    
    cout << "Enter up to " << size 
         << " nonnegative whole numbers.\n"         
         << "Mark the end of the list with a neg number.\n";    
    int next, index = 0;    
    cin >> next;      
    while ((next >= 0) && (index < size))    
    {   
        a[index] = next;        
        index++;        
        cin >> next;    
    }    
    
    number_used = index;
}

//C++, CPP
End of code

fakepoo · #2 24-Nov-2007, 12:00

I could not find anywhere in your code where you actually call the function triple(). Call it like this:

CPP / C++ / C Code:

int a = 5;
triple(a);
cout << a;

knightstorm · #3 25-Nov-2007, 10:27

Your problem is that you did not call the triple function in your code like the example here:

CPP / C++ / C Code:

#include <iostream>

void triple(int& number_used);
void fill_array(int a[], int size, int& number_used);


int main ()
{
    using namespace std;       
    int sample_array[5], number_used;    
    fill_array(sample_array, 5, number_used);      
        cout << "The array values are:\n";    
    for (int i = 0; i < 5; i++)
    {
         triple(sample_array[i]);
    }
    for (int index = 0; index < number_used; index++)       
        cout << sample_array[index] << " ";    
        cout << endl;   
    system("pause");
    return 0;
}

void triple(int & number_used)
{
    number_used *= 3;
}


void fill_array(int a[], int size, int& number_used)
{    
    using namespace std;    
    cout << "Enter up to " << size 
         << " nonnegative whole numbers.\n"         
         << "Mark the end of the list with a neg number.\n";    
    int next, index = 0;    
    cin >> next;      
    while ((next >= 0) && (index < size))    
    {   
        a[index] = next;        
        index++;        
        cin >> next;    
    }    
    
    number_used = index;
}

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C++ Function Trouble(I'm having trouble with my program).

Re: C++ Function Trouble(I'm having trouble with my program).

Re: C++ Function Trouble(I'm having trouble with my program).