Use strlen() to get the length of a char array buffer

  
#include <iostream>
#include <string.h>
using namespace std;
int main()
{
   char buffer[80];
   do
   {
      cout << "Enter a string up to 80 characters: ";

      cin.getline(buffer,80);

      cout << "Your string is " << strlen(buffer);

      cout << " characters long." << endl;
   }while (strlen(buffer));
   return 0;
}

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Use strlen() to get the length of a char array buffer : char array string « String « C++

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