C Project Problem Description Some Websites impose certain r

C Project

Problem Description:

Some Websites impose certain rules for passwords. Write a program and method that checks whether a string is a valid password. Suppose the password rule is as follows:

A password must have at least eight characters.

A password consists of only letters and digits.

A password must contain at least two digits.

Write a program that prompts the user to enter a password and displays \"valid password\" if the rule is followed or \"invalid password\" otherwise.

Sample 1

Enter a string for password: wewew43x

valid password

Sample 2

Enter a string for password: 343a

invalid password

Solution

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

int valid(char p[]){
int i,digit=0;
char ch;
size_t len = strlen(p);
if(len <8)
return 0;
for(i=0;i<len;i++)
{
  
ch=p[i];
if((ch >= \'a\' && ch <= \'z\') || (ch >= \'A\' && ch <= \'Z\'))
{
//do nothing
}
else if(ch >= \'0\' && ch <= \'9\')
{
digit++;
}
else
{
return 0;
}
}
  
if(digit<2)
return 0;
return 1;
}
int main(){

char password[20];
printf(\"Enter password: \");
scanf(\"%s\", password);
printf(\"Your password is %s.\", password);
if(valid(password))
printf(\"Valid Password\");
else
printf(\"Invalid Password\");
return 0;
}