Thread: How to give three attempt's to entered password

I wrote program to match password it works. I want to improve it. When user enter wrong password just give him three attempt's. I am stuck I don't have idea how to do it.

Code:

#include<stdio.h>

int main (void)


{
	int password = 123, EnteredPassowrd;
	
	printf("Please Enter Password : ");
	
	scanf("%d", &EnteredPassowrd );
	
	printf("Number enterd by you : %d \n", EnteredPassowrd);
	
	if(password == EnteredPassowrd)
	{
		printf("log in successful \n");


	}
	
	else
	{
		printf("log in faild \n");
	}
	return 0;
}

Originally Posted by stahta01

Learn about loops For, While and Do While Loops in C - Cprogramming.com

And, give it a try.

Tim S.

I have given my best try. I understand while and for loop. I am having problem to apply in program. It will appreciate if you can give some clues

Originally Posted by Salem

Perhaps post your best try.

I am thinking in this way but it's not what I want to do

Code:

#include<stdio.h> 
int main (void)
 
 
{
    int password = 123, EnteredPassowrd;
	
	int i = 0;
     
    printf("Please Enter Password : ");
     
    scanf("%d", &EnteredPassowrd );
     
    printf("Number enterd by you : %d \n", EnteredPassowrd);
     
    if(password == EnteredPassowrd)
    {
        printf("log in successful \n");
 
 
    }
     
    else
    {
        printf("log in faild \n Please try again \n");
		
		for ( i = 0; i < 3; i++)
			
			{
				 printf("Please Enter Password : ");
     
                 scanf("%d", &EnteredPassowrd );
     
     
                  if(password == EnteredPassowrd)
                   {
                        printf("log in successful \n");
				   }
				
			}
    }
    return 0;
}

Originally Posted by Salem

Change this

Code:

                  if(password == EnteredPassowrd)
                   {
                        printf("log in successful \n");
                        break;
                   }

Thanks Salem. It works but Is it possible without using break statement.

I think it can be using while loop. I understand how while loop work But I don't understand where to use it program

Originally Posted by Salem

Sure, you can make your conditional something like

Code:

int passwordCorrect = 0;
for ( i = 0; i < 3 && !passwordCorrect ; i++)

Thanks a lot for suggestion

Now just set the boolean at the appropriate moment in the code.

Please look at my flow chart

I made flow chart for program. If you see there, when false condition happen program start form beginning. how to repeat this process in three time if condition is false

Originally Posted by stahta01

do while loop

Basically I was trying to implement flow chart into program

this isn't my program suppose to do

Code:

#include<stdio.h> int main (void)
  
  
{
    int password = 123, EnteredPassowrd;
     
    int i = 0;
      
    printf("Please Enter Password : ");
      
    scanf("%d", &EnteredPassowrd );
      
    printf("Number enterd by you : %d \n", EnteredPassowrd);
      
    do 
    {
        if(password == EnteredPassowrd)
		{
		
		  printf("log in successful \n");
		 
		  printf("log in faild \n Please try again \n");
		}         
        else 
			
			{
				
				
				for ( i = 0; i < 3; i++)
             
                {
                    printf("Please Enter Password : ");
      
                    scanf("%d", &EnteredPassowrd );
      
      
                    if(password == EnteredPassowrd)
                       {
                          printf("log in successful \n");
                       }
				}
            }
    }
  
      
   while (password != EnteredPassowrd);
    
    
    return 0;
}

Originally Posted by Salem

OK, so where do you see a for loop in your flow chart?

Also, where on your flowchart is 'number of attempts'?

I suggest you start with an empty shell of a program just containing comments taken directly from your flowchart.

Code:

do {
// prompt user to enter password
// get password
// check password

// true: success
// false: print error message and try again
} while ( 0 );

I don't understand how to convert this statement into program

Code:

// false: print error message and try again
} while ( 0 );

just in case you still need help here is the c++ solution using a while loop. C++ and C are similar so it may help you find a solution. I would have done it in C but i thought this would be a more helpful way to learn. Or at least see the structure of the program.

Code:

#include <iostream>#include <string>


int main()
{
    //keep track of while loop
    bool correct = true;
    //Password user must enter to unlock
    int password = 123;
    //password user is entering
    int enteredPassword;
    //number of times user can enter password
    int numTries = 0;
    //continue asking until correct or 3 limit reached. 
    while(correct == true)
    {
        std::cout << "Password Checker" << std::endl;
        std::cout << "Please enter your password." << std::endl;
        std::cin >> enteredPassword;
        if(enteredPassword == password)
        {
            std::cout << "Correct password!" << std::endl;
            correct = false;
        }
        else
        {
            std::cout << "Wrong password!" << std::endl;
            numTries++;
            std::cout << "Attempted ";
            std::cout << numTries;
            std::cout << " out of 3." << std::endl;
            if(numTries == 3)
            {
                std::cout << "Too many password attempted!" << std::endl;
                std::cout << "Exiting program" << std:endl;
                correct = false;
            }
        }
        
    }
}