The program that prompts the user to enter a Social Security number in the format ddd-dd-dddd, where d is a digit can be implemented in Python using regular expressions. The regular expression pattern for the SSN format can be used to validate the input.
Pythons code:
```python
import re
ssn_pattern = re.compile(r'^\d{3}-\d{2}-\d{4}$')
ssn = input("Enter your Social Security Number (format: ddd-dd-dddd): ")
if ssn_pattern.match(ssn):
print("Valid SSN")
else:
print("Invalid SSN")
```
In the above code, we first import the `re` module to work with regular expressions.
We then define the regular expression pattern for the SSN format as `^\d{3}-\d{2}-\d{4}$`. This pattern matches any string that starts with three digits, followed by a hyphen, then two digits, another hyphen, and finally, four digits.
We then prompt the user to enter their SSN using the `input()` function. We then check if the entered SSN matches the pattern using the `match()` function of the regular expression object `ssn_pattern`.
If the SSN matches the pattern, we print "Valid SSN". Otherwise, we print "Invalid SSN".
Know more about SSN,
#SPJ4
ssn = input("Enter a valid Social Security number: ")
dashes = 0
nums = 0
message = "Invalid SSN"
if len(ssn) == 11:
for x in ssn:
if x.isdigit():
nums += 1
elif x == "-":
dashes += 1
if nums == 9 and dashes == 2:
message = "Valid SSN"
print(message)
I wrote my code in python 3.8. I hope this helps!
Answer:
Explanation:A letter is a written message conveyed from one person to another person through a medium. Letters can be formal and informal. Besides a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history.
Answer:
A letter is a written message conveyed from one person to another person through a medium. Letters can be formal and informal. Besides a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history.
Answer:
The formula in Excel is:
=($B$6 - $B$5 - $B$7)* $B$8
Explanation:
Required
Use of absolute reference
To reference a cell using absolute reference, we have to include that $ sign. i.e. cell B5 will be written as: $B$5; B6 as $B$6; B7 as $B$7; and B8 as $B$8;
Having explained that, the formula in cell B13 is:
=($B$6 - $B$5 - $B$7)* $B$8
Answer:
Identify any program or services that you do not need.
Explanation:
As a network administrator, one of the preventive measures that could be adopted to complement your security system or architecture is to identify all the software applications or services that you do not need in an organization. This is because some of these programs might be a spyware, rootkit or compromised software which are used to gain unauthorized access to the network system. Also, you should identify the unused or unwanted programs or services in order to prevent redundancy and to optimize the performance of critical machines or processes in the organization's network.
Hence, for additional security and to optimize the performance of critical machines on your organization’s network, it is crucial to identify any programs or services that you don’t need.
Answer:
Following are the statement in the c++ language
ifstream inFile; // declared a variable inFile
ofstream outFile;//declared a variable outFile
Explanation:
The ifstream and ofstream is the file stream object in the c++ Programming language .The ifstream file stream object is used for reading the contents from the file whereas the ofstream file stream object is used for writting the contents into the file.
ifstream variablename;
ofstream variablename
Answer:
Explanation:
#include <iostream>
#include <string>
#include<vector>
using namespace std;
vector<int> permute(vector<int>, vector<int>);
string encrypt(vector<int>s1 , vector<int> t1, string p);
string decrypt(vector<int>s1, vector<int> t1, string p);
int main() {
string plaintext = "cryptology";
string plaintext2 = "RC4";
vector<int> S(256);
vector<int> T(256);
int key[] = { 1,2,3,6 };
int key2[] = { 5,7,8,9 };
int tmp = 0;
for (int i = 0; i < 256;i++) {
S[i] = i;
T[i] = key[( i % (sizeof(key)/sizeof(*key)) )];
}
S = permute(S, T);
for (int i = 0; i < 256 ;i++) {
cout << S[i] << " ";
if ((i + 1) % 16 == 0)
cout << endl;
}
cout << endl;
string p = encrypt(S, T, plaintext);
cout << "Message: " << plaintext << endl;
cout << "Encrypted Message: " << " " << p << endl;
cout << "Decrypted Message: " << decrypt(S, T, p) << endl << endl;
tmp = 0;
for (int i = 0; i < 256;i++) {
S[i] = i;
T[i] = key2[(i % (sizeof(key) / sizeof(*key)))];
}
S = permute(S, T);
for (int i = 0; i < 256;i++) {
cout << S[i] << " ";
if ((i + 1) % 16 == 0)
cout << endl;
}
cout << endl;
p = encrypt(S, T, plaintext2);
cout << "Message: " << plaintext2 << endl;
cout << "Encrypted Msg: " << p << endl;
cout << "Decrypted Msg: "<<decrypt(S, T, p) << endl << endl;
return 0;
}
string decrypt(vector<int>s1, vector<int> t1, string p) {
int i = 0;
int j = 0;
int tmp = 0;
int k = 0;
int b;
int c;
int * plain = new int[p.length()];
string plainT;
for (int r = 0; r < p.length(); r++) {
i = (i + 1) % 256;
j = (j + s1[i]) % 256;
b = s1[i];
s1[i] = s1[j];
s1[j] = b;
tmp = (s1[i] + s1[j]) % 256;
k = s1[tmp];
c = ((int)p[r] ^ k);
plain[r] = c;
plainT += (char)plain[r];
}
return plainT;
}
string encrypt(vector<int>s1, vector<int> t1, string p) {
int i = 0;
int j = 0;
int tmp = 0;
int k = 0;
int b;
int c;
int * cipher = new int [p.length()];
string cipherT;
cout << "Keys Generated for plaintext: ";
for (int r = 0; r < p.length(); r++) {
i = (i + 1) % 256;
j = (j + s1[i]) % 256;
b = s1[i];
s1[i] = s1[j];
s1[j] = b;
tmp = (s1[i] + s1[j]) % 256;
k = s1[tmp];
cout << k << " ";
c = ((int)p[r] ^ k);
cipher[r] = c;
cipherT += (char)cipher[r];
}
cout << endl;
return cipherT;
}
vector<int> permute(vector<int> s1, vector<int> t1) {
int j = 0;
int tmp;
for (int i = 0; i< 256; i++) {
j = (j + s1[i] + t1[i]) % 256;
tmp = s1[i];
s1[i] = s1[j];
s1[j] = tmp;
}
return s1;
}
Answer:
Centralized Processing
Explanation:
Centralized processing was developed to process all of the data in a single computer, and since the first computers were stand-alone with all input and output devices in the same room, only the largest organizations could afford to use centralized processing.