:cheesy: thank you harshchandra :cheesy:

>if( s=="pass")
If we could do this, why would we need strcmp?

>gets(s);
gets is evil. There's no way to make it safe, so you would do well to forget it even exists.

Let's get you started off in the right direction. Unless you're a stubborn C programmer who can't see the benefit of C++ I/O, use iostreams for you input and output:

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#include <cstdlib>
#include <iostream>

using namespace std;

bool is_valid ( const char *pass );

int main()
{
  char pass[80];

  cout<<"Password: ";
  if ( !cin.getline ( pass, sizeof pass ) ) { //What does "!" do in !cin.getline...check private messages and I'll tell you why I ask
    cerr<<"Input error"<<endl; //what does cerr do?
    return EXIT_FAILURE;  //Where is EXIT_FAILURE returned to?
  }

  if ( is_valid ( pass ) )
    cout<<"Logged in"<<endl;
  else
    cout<<"Invalid password"<<endl;

  return EXIT_SUCCESS;  
}

#include <cstdlib> #include <iostream> using namespace std; bool is_valid ( const char *pass ); int main() { char pass[80]; cout<<"Password: "; if ( !cin.getline ( pass, sizeof pass ) ) { //What does "!" do in !cin.getline...check private messages and I'll tell you why I ask cerr<<"Input error"<<endl; //what does cerr do? return EXIT_FAILURE; //Where is EXIT_FAILURE returned to? } if ( is_valid ( pass ) ) cout<<"Logged in"<<endl; else cout<<"Invalid password"<<endl; return EXIT_SUCCESS; }

strcmp is just a loop that goes over both strings and terminates early if they're not equal at any point:

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bool is_valid ( const char *pass )
{
  const char *sys_pass = "pass";

  while ( *pass == *sys_pass ) {
    if ( *pass == '\0' ) //I know what \n means, but what does \0 mean?
      break;

    ++pass;
    ++sys_pass;
  }

  return *pass == *sys_pass;
}

bool is_valid ( const char *pass ) { const char *sys_pass = "pass"; while ( *pass == *sys_pass ) { if ( *pass == '\0' ) //I know what \n means, but what does \0 mean? break; ++pass; ++sys_pass; } return *pass == *sys_pass; }

>no one can answer me
Be patient and someone competent will happen by. Sometimes this takes days.