Thread: very noobie simple login

Code:

#include <stdio.h>
#include <string.h>


int main(void)
{
char name1, name2, pass1, pass2;

printf("input username: ");
scanf("%s", &name1);
printf("input password: ");
scanf("%s", &pass1);

puts("registration successful");
printf("USERNAME: ");
scanf("%s", &name2);
if(strcmp(name1, name2)==0)
{
puts("good now input your password");
}
else
printf("badbye\n");

printf("PASSWORD: ");
scanf("%s", &pass2);
if(strcmp(pass1, pass2)==0){
puts("logging in successful");
}
else
{
puts("wrong password");
}

getchar();
return 0;
}

anyone there?? i need help here can't get it right....

Use something like:

Code:

char name1[20], name2[20], pass1[20], pass2[20];

instead of

Code:

char name1, name2, pass1, pass2;

I'm learning c as well, and thought I'd have a go at this. Took your code and came up with this.

Code:

#include <stdio.h>
#include <string.h>

int main(void)
{
	char name1[15], name2[15], pass1[15], pass2[15]; //create char arrays
	int validUser=0;

	// Register a username and password
	printf("input username: ");
	scanf("%s", name1);
	printf("input password: ");
	scanf("%s", pass1);
	puts("registration successful");

	// Check for registered username
	printf("USERNAME: ");
	scanf("%s", name2);
	if(strcmp(name1, name2)==0)
	{
	validUser=1; // flag as good username
	puts("good now input your password");
	printf("PASSWORD: ");
	scanf("%s", pass2);
	}
	else
	{
	printf("Invalid user byebye !!\n");
	}
	
	// If we have a valid username, check the password
	if(validUser==1)
	{
		if(strcmp(pass1, pass2)==0)
		{
		puts("logging in successful");
		}
		else
		{
		puts("wrong password");
		}
	}
	getchar();
	return 0;
}

Code:

#include <stdio.h>
#include <string.h>




int main(void)
{
char name1[15], name2[15], pass1[15], pass2[15];

printf("input username: ");
scanf("%s", name1);
printf("input password: ");
scanf("%s", pass1);

puts("registration successful");
printf("USERNAME: ");
scanf("%s", name2);
if(strcmp(name1, name2)==0)
{
puts("good now input your password");
}
else
{
printf("badbye\n");
return 0;
}
printf("PASSWORD: ");
scanf("%s", pass2);
if(strcmp(pass1, pass2)==0){
puts("logging in successful");
}
else
{
puts("wrong password");
return 0;
}


return 0;
}

i have questions why do i have to remove the & sign......and sorry i dont know how to use the fgets() function i don't understand it i want to learn the use of fgets() but im having a hard time understanding it and i dont even know how to pause at the end the... pause that i know is getch() but i want to learn the code that you gave me dwks... i already read it in the faq but can't get it right.....help me in understanding...need help....if its okey can you modify my code, change scanf() to fgets() and using the cool pause at the end....thanks

1. scanf takes pointers as arguments. http://c-faq.com/stdio/scanf1a.html

2. fgets works by grabbing characters until it encounters and includes a newline character or until the buffer you supplied is filled (which is why you must pass its size), from the FILE *

Code:

/* For example: */
char str[40];
puts("Enter your name, stranger");
fgets(str, sizeof(str), stdin);

3. Programs only really pause for input. Use getchar or something like that to simlate a pause.

Just use a getchar (); before the return statement in main()
I think orange already showed that in code !!

Code:

int main()
{

/* Your code Here*/

getchar();   // The program waits for a user key press before it exits

return 0;
}

> btw can i put anything else instead of stdin as the third argument??
Sure you can. stdin is just a #defined FILE pointer after all; use any valid FILE pointer as the third argument. I don't think it matters for this program though.

okey understood thanks i really appreciate it......till next time...