main.cpp

#include <iostream>
using namespace std;

char x[27];
char c = 'a';

int main()
{
  for (int i = 0; i < 26; i++) {
    x[i] = c;
    c++;
  }

  string str;
  cout << "Please enter a string: ";
  cin >> str;
  bool pangram;
  size_t found;

  for(int i = 0; i < 26; i++) {
    found = str.find(x[i]);
    
    if (found != string::npos){  
      pangram = true;
    }
    else {
      cout << x[i];
      pangram = false;
      break;
    }
  }
  if(pangram == 0)
    cout << "String is not a pangram.";
  else
    cout << "String is indeed a pangram.";
  return 0;
}