Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Help please my program does not 'cout' results
int partition(int a[], int f, int r) {
int pivot = a[f]; // pivot is the first element
int small = f; // small pointer from the left
int large = r; // large pointer from the right
while (small <= large) { //until they cross // until the small and large cross
// loop for finding out-of-place pairs and swap them
// if both are bad (and not crossed yet), swap and then move
// if a[small] is OK, move small
// if a[large] is OK, move large
// TODO: **
while (small <= large && a[small] < pivot) { //you will be checking a[small] and a[large] against pivot
small++;
}
while (small <= large && a[large] >= pivot) { // TODO:**// return the partition point where
// those smaller than pivot are before what is returned
// there is a special cases (small is at the beginning)
large--;
}
if (small <= large) {
swap(a[small], a[large]);
}
}
return small;
}
//and a regular case
//end of while
int main()
{
int x; // number of elements
int nums[10];
cout << "How many elements? (must be less than 10) ";
cin >> x;
cout << "Enter elements one per line.." << endl;
for (int i = 0; i < x; i++)
{ cin >> nums[i]; }
// the pivot is always the first element
cout << "Ok the pivot is " << nums[0] << endl;
int part = partition(nums, 0, x-1);
cout << "Results..." << endl;
// display up to the partition without endl
for (int i = 0; i < part; i++)
cout << nums[i];
cout << "|";
// display from the partition on.. without endl
for (int i = part; i < x; i++)
cout << nums[i];
cout << endl;
}
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