c++ - What does "cannot Convert vector<int>* to int" mean? -

i have error:

error 1 error c2664: 'int practicemergesort(int,int,std::vector>)' : cannot convert argument 1 'std::vector> *' 'int'

i have no idea may cause of error or error telling me.

edit:

function prototypes int practicemergesort(int, int, vector<int>); int practicemerge(vector<int>, int, int, int);  int main() {     int numofitems;     srand(int(time(0))); // initialize random number generator     printf("algorithm comparison\n\n");      printf("selection sort\n");     //selectionsort();     practiceselectionsort(); // functioning version      //------------------------------------------------------------------     cout << "\nmerge sort\n";      cout << "enter number of items sorted: ";     cin >> numofitems;      vector<int> mergearray(numofitems);      cout << "value of numofitems: " << numofitems << "\n";      cout << "array values: \n";     (int x = 0; x < numofitems; x++)     {         mergearray[x] = rand();         cout << mergearray[x] << "\n";     }      practicemergesort(&mergearray, 0, numofitems);     //------------------------------------------------------------------      // testing of array filler     //printf("\narray filler\n");     //arrayfiller();      cout << "\n\n";      system("pause");      return 0; }  int practicemergesort(vector<int> mergearray[], int low, int high) {     if (low < high) {         int mid = (high + low) / 2;         practicemergesort(mergearray, low, mid);         practicemergesort(mergearray, mid + 1, high);         practicemerge(mergearray, low, mid, high);     }     return 0; }  int practicemerge(vector<int> mergearray[], int low, int mid, int high) {     vector<int> b[10000];     int = low, j = mid + 1, k = 0;      while (i <= mid && j <= high) {         if (mergearray[i] <= mergearray[j])             b[k++] = mergearray[i++];         else             b[k++] = mergearray[j++];         }     while (i <= mid)         b[k++] = mergearray[i++];      while (j <= high)         b[k++] = mergearray[j++];      k--;     while (k >= 0) {         mergearray[low + k] = b[k];         k--;     }     return 0; } 

your problem function prototypes don't match actual function definitions:

//function prototypes int practicemergesort(int, int, vector<int>); int practicemerge(vector<int>, int, int, int);  // functions int practicemergesort(vector<int> mergearray[], int low, int high) { //... }  int practicemerge(vector<int> mergearray[], int low, int mid, int high) { //... } 

change prototypes to:

int practicemergesort(vector<int> mergearray[], int low, int high); int practicemerge(vector<int> mergearray[], int low, int mid, int high); 

or if want keep using prototypes unnamed arguments:

int practicemergesort(vector<int> [], int, int); int practicemerge(vector<int> [], int, int, int); 

that make compile.