0

Below is the code for my merge sort - It doesn't like my temporary array c and I can't get anything to sort - I get all 0 in my output.

```
void merge(int low,int mid,int high)
{ int size, p, q, i, r;
size = high - low + 1; //size of array c
int c[size]; //array c - the temporary array for sorting
p=low; //index for a[i]...a[mid]
q=mid+1; //index for a[mid + 1]...a[j]
while((p<=mid)&&(q<=high))
{ if(a[p]<=a[q]) //copy smaller value to local array c
{ c[i]=a[p];
p++;
}
else
{ c[i]=a[q];
q++;
}
i++;
}
while (a[p]<= mid)//copy the rest of the longer array
{ c[i] = a[p];
}
while (a[q]<=high)//copy the rest of the larger array
{ c[i]=a[q];
}
for (i=low; i<=high; i++)//copy back from temp array to main array
{ a[i]=c[i];
}}
void merge(int low,int mid,int high)
{ int size, p, q, i, r;
size = high - low + 1; //size of array c
int c[size]; //array c - the temporary array for sorting
p=low; //index for a[i]...a[mid]
q=mid+1; //index for a[mid + 1]...a[j]
while((p<=mid)&&(q<=high))
{ if(a[p]<=a[q]) //copy smaller value to local array c
{ c[i]=a[p];
p++;
}
else
{ c[i]=a[q];
q++;
}
i++;
}
while (a[p]<= mid)//copy the rest of the longer array
{ c[i] = a[p];
}
while (a[q]<=high)//copy the rest of the larger array
{ c[i]=a[q];
}
for (i=low; i<=high; i++)//copy back from temp array to main array
{ a[i]=c[i];
}}
int main()
{ long timeElapsed;
timeElapsed = clock();
int num,i,elem, percent;
//a[num];
cout<<"*********************************************************************"<<endl;
cout<<" MERGE SORT PROGRAM"<<endl;
cout<<"**********************************************************************"<<endl<<endl<<endl;
cout<<"Please Enter THE NUMBER OF ELEMENTS you want to sort[THEN PRESS ENTER]:"<<endl;
cin>>num;
cout<<"Please Enter THE PERCENTAGE you want to sort[THEN PRESS ENTER]:"<<endl;
cin>>percent;
//for (i=1; i<=num; i++)
for (i=0; i<num; i++)
{ elem =(rand()+1);
cout<<endl<<"element "<<i<<"is "<<elem<<endl;
a[i]= elem;
cout<<"When i is "<<i<<" ai is "<<a[i];
}
merge_sort(0,num);
cout<<endl<<"So, the sorted list (using MERGE SORT) will be : "<<endl;
for(i=0;i<num;i++)
{ cout<<a[i]<<" ";
}
cout<<endl<<endl<<"Time Elapsed is: "<<timeElapsed<<endl<<endl<<endl<<endl;
system("PAUSE");
```