Recursive function and apvector

Niranjan · 04-04-2002

I have the task of creating a program that lets the user input numbers into an apvector then let them enter a goal(final number), and have a recursive function tell whether or not the numbers in the apvector can add up to be exactly the goal number. Im not sure where to start but this is what i have done so far.

Code:

bool IsPossible(const apvector <int> &A, int goal)
{
  
// I think i need code to add the elements of an apvector but 
//I dont know how to do something like that

if( *****  == goal)  
  return true;
else 

     

}

**xlnk** · 04-04-2002

try this example for adding elements of apvector:

Code:

bool IsPossible(const apvector <int> &A, int goal)
{
  
    A.resize(20);  // resize comes with apvector, the 20 can replaced by how large you want the array to be
    
    cout << "Enter number 1: ";
    cin >> A[0];   
    cout << endl;

    cout << "Enter number 2: ";
    cin >> A[1];
    cout << endl;

    // To add elements of an array;
    A[0] + A[1] = A[2];
    
    // You can also do something like this
    int Num;
    A[0] + A[1] = Num;

/*
    if( *****  == goal)  
    return true;
    else 
*/
     

}

**SilentStrike** · 04-04-2002

You can't do this..

A[0] + A[1] = A[2];
A[0] + A[1] = Num;

You cannot assign to a temporary variable. The result of A[0] + A[1] is a tempoarry. Perhaps you wanted the reverse?

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