Question

1. Write a program to test the correctness of a password according to some rules. If the password is not valid, print messages showing what's wrong with the password. Partial program output should look like this: Please enter a password. It must be at least 8 characters long and contain at least 2 alpha characters, at least one upper case and one lower case, at least 1 numbers, and at least 1 special character such as #, @ or $. Note that blank spaces are not permitted. Enter password: !# abcd Invalid password: >>> At least 8 characters >>> At least one upper case >>> At least one number >>> Blank spaces are not permitted Try again? Y Enter password: aBcd!2E4 Password accepted! Try again? n Goodbye and Happy Programming! 2. Write a function my_strcpy(char str1[], char str2[], int str2_size, int p1, int p2) which copies the C-string in str1 (from index p1 to index p2) to str2 (size is str2_size). Your function has to check if str2 has enough space. If there is no enough space in str2 to accommodate the string, print an error message but not copy anything to str2. Also write a driver program to test your function. Sample program output: str1 = I love C++ so much! str1 = I love C++ so much! Copy from str1 to str2 ... Copy from str1 to str2 ... Start position: 3 Start position: 3 End position: 13 End position: 10 >> Error str2 = love C++ >> str2 does not have enough space. Try again? (y/n) n >> Copy failed. Try again? (y/n) y Have a nice day!

Can I please get some assistance on this?

Answer 1

Answer:

As multiple questions are there, answering first question as per guidelines:

Here is the code:

#include <iostream>

using namespace std;

int main()
{
string password;
  
cout<<"Please enter a password. It must be at least 8 characters long and contain at least 2 alpha characters, at least one upper case and one lower case, at least 1 numbers, and at least 1 special character such as #, @ or $. Note that blank spaces are not permitted."<<endl;
  
char try_again = 'y';
  
while(try_again!='n')
{
  
cout<<"Enter password: ";
getline(cin, password);
  
int alpha_count = 0;
int upper_count = 0;
int lower_count = 0;
int numbers_count = 0;
int special_count = 0;
int blanks = 0;
  
for(int i=0; i<password.length(); i++)
{
if(password[i]>='a' && password[i]<='z')
{
alpha_count++;
lower_count++;
}
else if(password[i]>='A' && password[i]<='Z')
{
alpha_count++;
upper_count++;
}
else if(password[i]>='0' && password[i]<='9')
{
numbers_count++;
}
else if(password[i]==' ')
{
blanks++;
}
else
{
special_count++;
}
}
  
  
  
if(password.length()<8 || alpha_count<2 || lower_count<1 || upper_count<1 || numbers_count<1 || special_count<1 || blanks>0)
{
cout<<"Invalid password: "<<endl;
  
if(password.length()<8)
cout<<">>> At least 8 characters"<<endl;
if(alpha_count<2)
cout<<">>> At least 2 alpha characters"<<endl;
if(lower_count<1)
cout<<">>> At least one lower case"<<endl;
if(upper_count<1)
cout<<">>> At least one upper case"<<endl;
if(numbers_count<1)
cout<<">>> At least one number"<<endl;
if(special_count<1)
cout<<">>> At least one special character"<<endl;
if(blanks>0)
cout<<">>> Blank spaces are not permitted"<<endl;
  
}
else
{
cout<<"Password accepted!"<<endl;
}
  
cout<<"Try again?";
cin>>try_again;
cin.ignore(100, '\n');
cout<<endl;
  
}
return 0;
}

Output:

.be enter a password. It must be at least 8 characters long and contain at least 2 alpha characters, at least one upper case and one lower case, at least 1 numbers, and at least 1 special character such as #, or $. Note that blank spaces are not permitted. Enter password: !# abcd Invalid password: >>> At least 8 characters >>> At least one upper case >>> At least one number >>> Blank spaces are not permitted Try again? Enter password: abcd!2E4 Password accepted! Try again?n ... Program finished with exit code 0 Press ENTER to exit console.

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