how to set char [ ] so it will give output if we enter any character or any no. Code is given below

Question

So main line is 8 Code is given below and program is about reversing the string. Basically I have given the character value 80 I want help so If I enter value it will reverse the string

#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;
void reverse(char[], int);
int main()
{
    char a[80];
    int length;
    cout << "\n Enter text:";
    cin >> a;
    length = strlen(a);
    cout << "\n The orginal string is:";
    puts(a);
    reverse(a, length);
    cout << "\n The modified string is:";
    puts(a);
}
void reverse(char str[], int l)
{
    char temp;
    for (int i = 0; i < l / 2; i++) {
        temp = str[i];
        str[i] = str[l - i - 1];
        str[l - i - 1] = temp;
    }
}