transmission a function pointer to another program file - c++

Question

i want to create a link between two programs throughout the execs functions .
my idea is to create function then point on it by a function pointer then send it to the other program to test it . this is my first programenter code here
1- is this possible ?
2- how ?
i get this idea because i find each time to change the function name in the main function but the remainning still as it was but if i send a pointer function as a character pointer then my programm still as it without changing
#include <iostream>
#include <cstdlib>
#include <unistd.h>
using namespace std;
void
Random(int* ,const int );
int*
selection_sort(int *arr ,const int length)
{
int i = 0,minIndex{0},tmp{0},k{0};
while(i < length-1) // T(n-1) * C1
{
minIndex = i; // Tn * C2
for(int j = i+1 ; j < length ; j++ ) // som(Ti) from i = 0 to i = length-1 )*C3.
{
if((arr)[j] < (arr)[minIndex])
minIndex = j;
}
if(minIndex != i) // Tn * C4
{
tmp = (arr)[i];
(arr)[i] = (arr)[minIndex];
(arr)[minIndex] = tmp;
}
i++;
}
return arr;
}
void
Random(int* array,const int length)
{
srand(time(nullptr));
int i{-1};
while(i++ < length)
{
array[i] = rand()%100;
sleep(0.2);
}
}
int main(int argc,char* argv[])
{
int* (*ptr)(int*,const int ) = selection_sort;
execl("/home/hellios/Documents/Algorithms/sort_Algorithms/main",(char*)ptr,0); // complete the call
return EXIT_SUCCESS;
}
sort_Algorithms/main.c
#include <iostream>
#include <unistd.h>
#include <stdlib.h>
#include <ctime>
using namespace std;
void
Random(int* array,const int length);
int
main(int argc,char* argv[])
{
int* (*ptr)(int *,const int ) =(int* (*) (int*,const int)) argv[1];
int arr1[100],k{0},*arr;
Random(arr1,100);
arr = (*ptr)(arr1,100);
//selection_sort(arr,100);
cout<<"out of selection_sort"<<endl;
for(int j = 0 ; j < 100 ; j++ )
{
printf("[%d]\t", arr[j]);
if(!(++k %10))
cout<<endl;
}
printf("\n");
return EXIT_SUCCESS ;
}
void
Random(int* array,const int length)
{
srand(time(nullptr));
int i {-1};
while(i++ < length)
{
array[i] = rand()%100;
sleep(0.2);
}
}