Password Creator Checker

[moiron]

i need help making a password program. it lets the use input a password and check it if it is following the password rules, which are the following:

must have exactly 7 characters, only alphabets and digits are allowed.

i don't exactly know how to put that in an if else function, but i know i have to use that.

i also don't know if the string.h library is needed but, in our book, the question was from a chapter with strings.

[jephthah]

use "strlen" and check character ranges. look at your ascii table.

post some code if you want any more advice.

[moiron]

i guess i can use that to check the length, and use the if else to see if the length is exactly 7.
and since the password is supposed to be 7 would i need to make the array size 8 for the \0 part of the string?

since u told me to post a code im gonna try but i know its wrong.

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

int main (void)
{
	int length;
	char pass[8];
	printf("Enter a password with 8 characters.");
	printf("It must have at least 1 digit and 1 alphabet.");

	fgets( pass, 8, stdin);

that's what i have for now, im trying to add the if function with strlen in it

[extofer]

Use the length() function and return a boolean

string str ("pasword");

if str.length() < 7 {
return 0;
}
else{
return 1:
}

[jephthah]

that doesnt help him if his password is supposed to be EXACTLY seven characters, now does it?

and this is C, not C++

[WaltP]

After reading in the password call functions to test each individual rule. Don't try to test all things in one function, or ghod forbid right after the read.

[dmachop]

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

int main()
{
char un[7],pwd[10];
int i,f;
printf("\nEnter user name and pwd");
scanf("%s%s",un,pwd);
if(strlen(un)==7)
{
for(i=0;i<strlen(pwd);i++)
{
if(!isalnum(pwd[i]))
f=1;
}
}
if(f==1)
printf("pwd error");
else
-------proceed---------------
}

I think the question is incomplete and need more details...........

SNIP