I am having trouble with the Caesar problem set, specifically with handling non-numeric keys. My code looks like the following : printf("%c", (text[i] - 97 + n) % 26 + 97 ); printf("%c", (text[i] - 65 + n) % 26 + 65); I am trying to include an isdigit() or !isdigit() somewhere outside the For loop, but anywhere I add it results in the error Segmentation Fault when I compile and run it. Demanding, but definitely doable. Would anyone be interested in being my partner for the final project and a general study buddy? #include #include #include #include #include /* *FILE : caesar.c *AUTHOR : Mahmoud Solomon *COUNTRY : Liberia *ABOUT : This program as the basis of cryptography uses a keyword to encrypt a string of text. Contribute to mareksuscak/cs50 development by creating an account on GitHub. @biplavc @Blauelf I didn't submit the scratch, but the problem was sorted out once I delinked the authorization of cs50 with GitHub, and linked it again . A focused topic, but broadly applicable skills. caesar As the title says my program compiles correctly, however when i run check50, I get "handles non-numeric key expected exit code 1, not 0." It is also known with other names like Caesar’s cipher, the shift cipher, Caesar’s code or Caesar shift. Encryption with Vigenere uses a key made of letters (and an alphabet). string plaintext = get_string("plaintext: "); for (int i = 0; i < plaintextLength; i++). Press question mark to learn the rest of the keyboard shortcuts. CS50 is the quintessential Harvard (and Yale!) Tech geek turning my hobbies into a career during a career switch point of my life. I have "return (1);" in my code. course. Press J to jump to the feed. I am having trouble with the Caesar problem set, specifically with handling non-numeric keys. TODO ¨ get the key ¨ get the plaintext ¨ encipher ¨ print ciphertext $ ./caesar 2! biplavc. Due to this simplici… This file presents a solution for the caesar problem in pset2 of CS50x. Thanks! Press J to jump to the feed. I was just missing an extra two lines of code. The key difference is that this program takes a command line argument in the form of a 26 character string which uses each letter of the alphabet exactly once in order to substitute letters based on their position in the alphabet. Let’s call this k. int k = argv[1] This thing is in the requirements we must use an integer as the key so even if a number is inputted it will be considered a ‘string’ because so we need to convert it to a number. I´m almost done. Blauelf @Blauelf. The obtained score can be seen on CS50 Gradebook(see in mentioned links below). Please help!! I have "return (1);" in my code. What is Caesar Cipher? Previous Programming in C: Implementation of caesar.c (a less secure encryption system). Harvard CS50x — 2018 solutions ‍. I am new here, Doing the Cs50 for business professionals. More formally, if p is some plaintext (i.e., an unencrypted message), p i is the i th character in p, and k is a secret key (i.e., a non-negative integer), then each letter, c i, in the ciphertext, c, is computed as More generally, Caesar’s algorithm (i.e., cipher) encrypts messages by "rotating" each letter by k positions. { // chech for non-numeric key int len_of_argv = strlen(argv[1]); for (int i = 0; i < len_of_argv; i ++) { int restz = isalpha(argv[1][i]); if (restz != 0) { printf("Usage: ./caesar key \n"); return 1; } } int k = atoi(argv[1]); // get the ceasar KEY value convert into integar string s = get_string("plaintext: "); // get text printf("ciphertext: "); // print out cipher This encryption technique is used to … add an isalpha if statement before checking for is lower, and at the end add an else for that if statement saying: New comments cannot be posted and votes cannot be cast. cs50/x. This is CS50. More formally, if p is some plaintext (i.e., an unencrypted message), p i is the i th character in p, and k is a secret key (i.e., a non-negative integer), then each letter, c i, in the ciphertext, c, is computed as caesar.c cs50 solution, I just started CS50 yesterday. A focused topic, but broadly applicable skills. I need some help with this question. ./caesar [key] This means we need to re-call for the argv[1] and put it into a new variable to use in the program as the key number. Thanks a lot! Next Implementation of Caesar in C –> CS50. I would appreciate it if you could give me a hint so I can finish the PSET2. CS50 has 225,432 members. int keyRemainder = (plaintext[i] + key) - 'Z'; keyRemainder = plaintext[i] + keyRemainder - 'Z'; int keyRemainder = (plaintext[i] + key) - 'z'; keyRemainder = plaintext[i] + keyRemainder - 'z'; You have to write a condition where your code stops by returning one when the key is not a positive numeric value. There are several ways to achieve the ciphering manually : Vigenere Ciphering by adding letters. def main(): # Gets key as int; validates while True: key = int(sys.argv[1]) if key > 0: break # Gets plaintext print("Plaintext: ", end="") ptext = cs50.get_string() print("Ciphertext: ", end="") # Enciphers while preserving case for i in range(len(ptext)): # Character is uppercase if str.isupper(ptext[i]): upper = (((ord(ptext[i]) - 65) + key) % 26) + 65 … Is it just not in the right place? Caesar Non-Numeric Key. I couldn't find a solution, as I think this requirement is only for the newer version of Caesar? More generally, Caesar’s algorithm (i.e., cipher) encrypts messages by "rotating" each letter by k positions. Thanks for any input. In cryptography, Caesar cipher is one of the simplest and most widely known encryption techniques. I started CS50 back in March when my country got shut down and I had a lot of spare time. import cs50 import sys # Implements a Caesar cipher. I have about 3 months of Python study under my belt so far via Udemy and such. ... the Caesar cipher, which takes a numeric command line argument and … Thank you! Create a free website or blog at WordPress.com. Hello! One of cryptography’s oldest and most popular ciphers, the Caesar cipher is named after the legendary Roman emperor Julius Caesar, who used it to protect his military communications. Run program and enter key.\n"); return 1; } // get the plain text string PlainText = GetString (); // convert the string/second command line argument (number) to integer key = atoi (argv [1]); // if key >= 26, use modulo 26 to wrap back to Aa after Za if (key >= 26) { key = (key % 26); } // encrypt - iterate over characters in string // print each one one at a time for (int i = 0, length = strlen (PlainText); i < length; i++) { // test - … caesar. Hello! Is it just not in the right place? This is CS50's (and CS50x's) official Facebook group. Hi guys, I´m having trouble with the non-numeric key in Caesar. Suppose that an engineer excitedly runs up to you and claims that they've implemented an algorithm that can sort n elements (e.g., numbers) in fewer than n steps. course. */ #define ALPHABET 26 int main(int argc, string argv[]) { int KEY = 0; // Check for the argument count if… New comments cannot be posted and votes cannot be cast. All posts should be directly related to CS50. People Repo info Activity. // check if the integer is non-negative if (k < 0) { printf("Usage: ./caesar key\n"); return 1; } else { // prompt user for a code to encrypt string code = get_string("plaintext: "); printf("ciphertext: "); for (int i = 0, n = strlen(code); i < n; i++) { //check if the letter is uppercase or lowercase then convert if islower(code[i]) printf("%c", (((code[i] + k) - 97) % 26) + 97); else if isupper(code[i]) printf("%c", (((code[i] … Caesar in Action Finally, the last problem (more comfortable) of the set was called Substitution, which was actually pretty similar to Caesar in a lot of ways. Social, but educational. As the title says my program compiles correctly, however when i run check50, I get "handles non-numeric key expected exit code 1, not 0." Press question mark to learn the rest of the keyboard shortcuts. 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