Reverse a String ??

#include <iostream>
using namespace std ;
//Instead of using length functon you can use a inbuilt function called 'strlen' but if you want to
//use it then you must include <cstring> library. Program will become lot easier.
int length(char input[]) {
    int count{0};
    for (int i = 0; input[i] != '\0'; ++i) {
        count++;
    }
    return count;
}

void reverse(char input[]){
    int start{0} ;
    int end{length(input) - 1} ;
    while (start < end){
        swap(input[start],input[end]);
        start ++ ;
        end -- ;
    }
}

int main(){
    char name[100] ;
    cout << "Enter string : " ;
    cin.getline(name,100);
    reverse(name) ;
    cout << "Reversed string is " << name ;


}