How to make the code with Random numbers and Time Executation?

```
#include <iostream> /* cout */
#include <cstdlib> /* srand, rand */
#include <ctime> /* time() */
#include <list> /* list */
#define BASE 10 // # of buckets to use
#define ARRAY_SIZE 50 // max # of elements in array
using namespace std;
// function prototypes
void radix(int* nums, int length, int max);
int main() {
int nums[ARRAY_SIZE];
int i;
int max=0;
srand(time(NULL));
// store random numbers to array, print their current order
cout << "Before:\r\n";
for (i=0; i<ARRAY_SIZE; i++) {
// generate random #, 1-1000
nums[i] = rand()%1000 + 1;
// determine max element upon addition to array
max = (nums[i] > max)? nums[i]: max;
cout << "\t" << nums[i] << "\r\n";
}
cout << endl << endl;
// sort using radix algorithm, passing max element
radix(nums,ARRAY_SIZE,max);
// print sorted array
cout << "After:\r\n";
for (int i=0; i<ARRAY_SIZE; i++)
cout << "\t" << nums[i] << "\r\n";
return 0;
}
void radix(int* nums, int length, int max) {
list<int> bucket[BASE];
int i;
// iterate through each radix until n>max
for (int n=1; max >= n; n *= BASE) {
// sort list of numbers into buckets
for (i=0; i<length; i++)
bucket[(nums[i]/n)%BASE].push_back(nums[i]);
// merge buckets back to list
for (int k=i=0; i<BASE; bucket[i++].clear())
for (list<int>::iterator j = bucket[i].begin(); j != bucket[i].end(); nums[k++] = *(j++));
}
}
```