# Thread: Insertion Sort Counting Comparisons

1. ## Insertion Sort Counting Comparisons

I'm trying to print the number of comparisons made when doing an insertion sort and the program compiles without a problem but after being prompted to type in however many numbers are necessary, when I input numbers nothing happens.

Code:
```#include<iostream>
using namespace std;

#define MAX_LIST_LEN  100

int main(){

int    n,                    // list length
j,                    // loop control
L,                   // index of maximum element in unsorted section
a[MAX_LIST_LEN];   // array to be sorted
// Get values for n and list.
cout << "Enter list length (must be less than or equal to "
<< MAX_LIST_LEN << "): ";
cin  >> n;
cout << "Enter " << n << " numbers:" << endl;
int count = 0;
for (int L = 2; L<n; L++){
while (L <= n)
j = L;
while (j>=2
)a[j]<a[j-1];
a [j] == a[j-1];
j = j-1;
int L = L+1;
while (L>=1&&++count&&a[j]<a[j-1]
)cout << count << " ";

return(0);
}
}```

2. How many different variables called L do you have?

How many do you need?

Which one is in scope at any given point in the code?

3. I cut the variables down to one but now the program won't compile at all:

Code:
```#include<iostream>
using namespace std;

#define MAX_LIST_LEN  2000

int main(){

int    n,                    // list length
j,
L,                    // loop control
a[MAX_LIST_LEN];   // array to be sorted
int count = 0;
for (L = 2){
while (L <= n)
j = L;
while (j>=2
)a[j]<a[j-1];
a [j] == a[j-1];
j = j-1;
while (L>=1&&++count&&a[j]<a[j-1]
)cout << count << " ";

return(0);
}
}```
When I try to compile I receive these errors:

Code:
```InsertionSort.cpp:22: error: expected `;' before â)â token
InsertionSort.cpp:34: error: expected primary-expression before â}â token
InsertionSort.cpp:34: error: expected `;' before â}â token
InsertionSort.cpp:34: error: expected primary-expression before â}â token
InsertionSort.cpp:34: error: expected `)' before â}â token
InsertionSort.cpp:34: error: expected primary-expression before â}â token
InsertionSort.cpp:34: error: expected `;' before â}â token```

4. > for (L = 2)