please answer me,,

[dreams]

hi evryone..
i've couple quistions for you.. and i hope you answer it,,

1\ my dear computer dosen't run the c++ source file..even there is no error..
and that file is the only one i open..if there is any one know..please help me..

2\ i have an array of objects and i want the user to enter the size of the array ..
how am i going to do that..???
thats all...thank you

[Ganon11]

I can help you with number 2:

In order to allow the user to input the size of the array, you have 2 options:

1) Create a very large array, such as int array[1000]. Ask the user for input into a variable size, and then perform operations only on array[0]...array[size-1]; For example:

 int array[1000]; 
int size;
cout << "How many values? ";
cin >> size;
for (int i = 0; i < size; i++) {
   cout << "Enter value " << i + 1 << ": ";
   cin >> array[i];
}

However, there is a lot of wasted computer space, since a user may enter a small value (such as 10) for size and leave 990 integer values unused.

Therefore, the much better solution is

2) Use pointers. A pointer is a special type of variable most useful for this type of array and large data structures. It would be impossible for me to fully explain pointers to you, so I will limit my description to pointer arrays.

You know that you cannot execute the following statements:

 int size; 
cout << "Please enter the size: ";
cin >> size;
int array[size];  // Error!  C++ requires a constant

However, by making array a pointer, you can do this. To make array a pointer, use this statement:

 int *array; // NOT int array[whatev];

Then you can prompt the user for input into size, and finally say

 array = new int[size];

For general purposes, these are the only changes you need to know about for pointers. You can now treat array the same as a regular integer array.

Your resulting code would be:

 int size; 
int *theArray;
cout << "Please input the size: ";
cin >> size;
theArray = new int[size];
 
for (int i = 0; i < size; i++) {
   cout << "Please enter value " << i + 1 << ": ";
   cin >> theArray[i];
}