insertion_sort, C++ (gcc)

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#include <iostream>
#include <cstdlib>
using std::cout;
//Template, sorts in nondecreasing order for anything where ">" and "<" are defined
template<class T>
T* insertion_sort1(T array[], int size)
{
    int j = 1,i;
    T key;
    while(j < size)
    {
        key = array[j];
        i = j - 1;
        while(i >= 0 && array[i] > key)
        {
            array[i+1] = array[i];
            array[i] = key;
            i--;            
        } j++;
    } return array;
}
// Sorts in nonincreasing order for anything where ">" and "<" are defined
template<class T>
T* insertion_sort2(T array[], int size)
{
    int j = 1,i;
    T key;
    while(j < size)
    {
        key = array[j];
        i = j - 1;
        while(i >= 0 && array[i] < key)
        {
            array[i+1] = array[i];
            array[i] = key;
            i--;            
        } j++;
    } return array;
}
template<class T>
void print(T array[], int size)
{
    int i = 0; size--;
    cout<<"{";
    while(i < size)
        cout<< array[i++] <<",";
    cout<<array[i]<<"}";
}
int main(int argc, char* argv[])
{
    int length = argc-1;
    if(length == 0)
    {
        cout<<"Enter elements of the array to be sorted via the CLI thus: ";
        cout<<"\"./a.out 31 4 59 26 41 58\"\n";
		return 0;
    }
    //int a[length];
    float b[length];    
    int i = 0;
    
    while(i < length)
    {
       // a[i] = atoi(argv[i+1]);
        b[i] = atof(argv[i+1]);
        i++;
    }
    
    cout<<"Sorting array: "; print(b,length);
    cout<<"\n";

cout<<"(increasing order) --> "; 
    print(insertion_sort1(b, length),length); 
    cout<<"\n";

cout<<"(decreasing order) --> ";
    print(insertion_sort2(b, length),length);
    cout<<"\n";

return 0;
}

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Compilation time: 0.44 sec, absolute running time: 0.11 sec, cpu time: 0.06 sec, memory peak: 3 Mb, absolute service time: 0,57 sec