TemplateRemove, C++ (gcc)

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//g++  7.4.0

//Template remove: remove item from an array of chosen data type
//this code is created by Rezaul Hoque on June 09,2021;  contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their  learning;

//in C++, template allows a program to use the same function or class for different data types 
//the function del written in C in previous program is used here in template form to demonstrate one of the strong features of C++

#include <iostream>
using namespace std;
int n=10;
template <class T>//template declaration: keyword template, then typename/class followed by type parameter( a placeholder for other data types) in the angle brackets 
int retPos(T [], T);//the function 
template <class T>
void del(T [],  int (*f)(T [],T ));

template <class T>

int retPos(T a[],T q){
cout<<"\nItem to be deleted:\n";
cin>>q;
for (int i=0; i<n;i++)
if(a[i]==q)
     return i;
}
template <class T>
void del(T  a[],   int (*f)(T a[],T q))
{
int b,x;
T q;//item to be deleted of the type chosen by user
x=(*f)(a,q);

for (b=x;b<n;b++)
a[b]=a[b+1];

}

int main ()  
{  
    int a[10]= {101,123,124,6,5,90,76,67,45,65};  //an array of integers
char c[10]={'k','n','z','y','t','d','s','g','p','q'}; //an array of chars
    cout<<"\nInitial array:\n";
for(int i=0;i<n;i++)
cout<<" "<<a[i];
cout<<"\n";
for(int i=0;i<n;i++)
cout<<" "<<c[i];
cout<<"\n";
del(a,retPos);
del(c,retPos);
cout<<"\nNew array:\n";
for(int i=0;i<n;i++)
cout<<" "<<a[i];
cout<<"\n";
for(int i=0;i<n;i++)
cout<<" "<<c[i];
cout<<"\n";
return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 6 Mb, absolute service time: 0,63 sec