Questions tagged [pset2-substitution]

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Trying to do pset 2, but it doesn't even accept my input. What am I doing wrong?

#include <stdio.h> #include <cs50.h> #include <ctype.h> #include <string.h> #include <math.h> int check(int c, string key); int main(int argc, string argv[]) { int ...
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1answer
19 views

Clang can't find -lcs50.h

I am trying to compile my code and make a clang file but every time I try to do it it tells me that the cs50.h file can't be found and I don't know what I can do to fix it. Please help me. I have ...
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16 views

Program just exits instead of printing errors

#include <stdio.h> #include <ctype.h> #include <string.h> #include <stdbool.h> #include <cs50.h> int checkerrors(int argc, string argv[]); int main(int argc, string ...
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24 views

isalpha() returns non-zero integer with non-alphabetic character

#include <stdio.h> #include <ctype.h> int main(void) { char c = '+'; int example = isalpha(c); printf("%i\n", example); } It should return 0 but it gives me random ...
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1answer
19 views

PS2 - substitution

thanks for helping me out :) When I am running my code I get a weird output, an intractable char that is being added randomly to my output. The weird thing is that that the char that is being added is ...
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1answer
13 views

pset2 making a whole string uppercase for use in substitution.c

I am trying to use the following helper function inside my substitution.c script: string upper(string key) { int n = strlen(key); char key_upper[n]; for (int i = 0; i < n; i++) { ...
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0answers
17 views

How can this approach be improved upon? What are some immediate inefficiencies and things that need to be changed

So while I was able to pass all the functionality tests, I am curious about what the most serious shortcomings in my code are. It's a question I've been concerned about asking, but seeing the ...
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0answers
44 views

Encrypt plaintext in substution.c

Here is my encryption of plaintext after validation the key. //Encrypt Code string plaintext = get_string("plaintext: "); // int array[26] = {0}; string encText = plaintext; //converts user ...
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2answers
25 views

pset 2 - Substitution - “output not valid ASCII text” error

My substitution cipher is producing the correct output on my terminal when I run the same checks. I have reviewed other responses to similar issues but wasn't able to figure out how to find my error. ...
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1answer
72 views

Segmentation fault in Substitution - Problem Set 2

I have finally finished writing my code for the Substitution question in Problem Set 2, but Check50 tells me that my code has a segmentation fault when there is a lack of key. My code is as follows: #...
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2answers
45 views

How to reject repeated letters for Substitution in Problem Set 2

I am trying to write some code for the Substitution question in Problem Set 2, but I cannot figure out how to reject the case where a user gives a key with repeated letters. My code thus far is as ...
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1answer
76 views

pset2 substitution

I was trying to do substitiution on two loops but i had some issues. i found onle loop solution here https://stackoverflow.com/questions/61767483/free-invalid-pointer-aborted-core-dumped-cs50 but now ...
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2answers
65 views

pset2 substitution - isalpha doesn't seem to recognize letters

I'm relatively inexperienced at programming, but I thought I understood how to use command-line prompts well enough to try the substitution problem. I'm having an issue with isalpha that I don't ...
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1answer
42 views

Pset2 - Substitution: Output seemed correct, failed on some check50

Thanks in advance for your help. After completing Substitution, I ran check50 in terminal and was surprised to see that I had failed 4 of the checks. After debugging I located the source of the error. ...
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1answer
42 views

Why do i get these errors? i am new to programming so please be easy on me. The errors are in the body

#include<stdio.h> #include<cs50.h> #include<string.h> #include<ctype.h> bool check_validity_key(string s); int main(int argc, string argv[]) { if (!check_validity_key(argv[...
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1answer
64 views

PSET 2 Substitution

My question is about a cs50 PSET. The goal is to create some sort of encryption program. From command line arguments there is a key inputted and every key letter should be replaced with the alphabet ...
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2answers
194 views

PS2 substitution

I am trying to check that the substitution key contains all the alphabets but am getting error: expression result unused for this line of code: s, l ++; Can anyone help, this is my code as of now: ...
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1answer
1k views

Pset 2 - Substitution

I hope you are all well. Just had a quick question about CS50 Pset2's substituion problem. Please see my code below. #include <stdio.h> #include <cs50.h> #include <string.h> #...
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2answers
567 views

“Output not valid ASCII text” error with Substitution pset

i'm having these errors when i check my code. This is it: #include <stdio.h> #include <cs50.h> #include <string.h> #include <ctype.h> int main(int argv, string argc[]) { ...