Questions tagged [pset2]
The problem set for Week 2 continues with the C programming language used in problem set 1.
1,274
questions
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1
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CS50 Pset2 Substitution "expected prompt for input, found none"
When I run the code manually, everything works fine:
[snipped out code]
{
if (isalpha(argv[1][i]))
{
//Check that each character is only ...
- 5
0
votes
1
answer
21
views
Use of bool in PSET2
So i'm trying to approach this pset using functions more than i have in previous attempts. the hints suggested to use bool to check if key is valid. my code compiles and all the rest of the parts ...
- 1
0
votes
1
answer
9
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Error when calling seconnd function - expected expression
I'm trying to call my encryption function and am getting an undeclared identifier error. Not sure where i'm going wrong.
Code:
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
...
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0
votes
1
answer
21
views
CS50 Readability solution unsolvable to me
I coded this solution myself, but I really can't figure out where I did wrong, I've spent days on this, and I would really appreciate any help!! Please, 😭
#include <cs50.h>
#include <stdio.h&...
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0
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0
answers
22
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Ciphertext is not working
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, string argv[])
{
//program can only run with one ...
0
votes
1
answer
3
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PSET2 "linker command failed with exit code 1"
So I was working on the Caesars problem trying to check that every character in argv[1] is a digit when i get this error trying to compile it:
`/usr/bin/ld: /tmp/caesar-d6b46b.o: in function 'main':
/...
0
votes
2
answers
14
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Readability - use of undeclared identifier "i"
I have already identified "i" in my code, but it kept showing me error that use of undeclared identifier "i". I am not really sure how to fix it. Would appreciate if you show me ...
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23
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How do I return my array of chars in a function to a string in main()
I'm having difficulty implementing the two sections of code for the caesar pset. Individually I have made both my main() and my rotating algorithm caesar() work, but am having trouble combining them, ...
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0
votes
1
answer
35
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readability error
I keep getting this error: 'declaration shadows a variable in the global scope'
how do I fix it ?
here is my code
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <...
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0
votes
1
answer
15
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Pset 2 - Substitution: Incompatible Integer to Pointer Conversion Error
I've tried this over and over and can't get this right. This is only a snippet of my code. I keep on getting this error:
"testcode.c:21:31: error: incompatible integer to pointer conversion ...
0
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1
answer
22
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Help with cipher text in Pset2 substitution
I think I am getting close on Pset2 substitution. But every time I run this code it outputs my ciphertext as void. There's obviously something wrong with my loops converting plaintext to ciphertext ...
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0
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1
answer
180
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CS50P - Error in pset2 (Coke)
In pset2 (Loops), 2nd problem ("Coke"),
I believe there's an error in the 4th test that check50 performs: it requires an output of $0.50 after the user entered $0.30. The full price is $0.50,...
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0
votes
2
answers
37
views
check50 says i have no output on pset2 substitution, but my code does output correctly
On my end my code seems to output exactly what check50 wants, yet it says that ive outputted nothing.
e.g :( encrypts "A" as "Z" using ZYXWVUTSRQPONMLKJIHGFEDCBA as key
Cause ...
0
votes
1
answer
14
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When i try to make this string lowercase, it does it to both the one i want and another one
string key = argv[1];
string low = key;
for(int i = 0; i < strlen(low); i++)
{
low[i] = tolower(low[i]);
}
through the debugger i can see that this is correctly making &...
0
votes
0
answers
100
views
How do you call a boolean function in main?
In problem set two it asks to use a separate function outside of main to determine if the string argv[1] has digits. I believe I've done this correctly in that function, but I'm struggling to call it ...
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votes
1
answer
37
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PSET2 -CAESAR - compiler doesn't see the rest of program
i have a problem with this pset.
My program compiles properly, but when i'm launching it with key, it stops before get_string...
When i'm using the only_digits function which is commented in bottom of ...
0
votes
0
answers
48
views
pset 2, SUBSTITUTION, working according to specs EXCEPT for UPPER LOWER case spec, code review request
Could anyone please review my code? Specifically the last lines, concerning the case assignment.
I got all the other specs to work, except for that last part. I can't figure out what is it that I've ...
0
votes
1
answer
32
views
encrypts "a" as "b" using 1 as key output not valid ASCII text
I have been trying to figure out what the issue is in my Caesar code.
When I run check50, I see 2 errors -
encrypts "a" as "b" using 1 as key output not valid ASCII text
&
...
0
votes
0
answers
30
views
PSET2 SUBSTITUTION works fine ONLY if plaintext is UNDER 9 CHAR
I was approaching the end of the substitution problem of PSET2 when I hit a snag I could not solve.
I have already written the code to check the key for the various conditions they provide. My problem ...
1
vote
1
answer
25
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pset2, problem SUBSTITUTION, Is there more than 1 way to check for repeated characters in the 26-character key?
I have a question concerning pset2, SUBSTITUTION.
I finalized the 3 initial filters of this problem:
character count
argument count
non-alphabetical characters.
now I'm moving to the fourth ...
0
votes
1
answer
22
views
How to solve "error: expected expression" while doing Caesar.c
I'm trying to solve Caesar but i keep getting this error:
caesar.c:37:20: error: expected expression
s[i] = char(int(text[i]+k-97)%26+97); \\ the arrow points to the 'c' in char
#include <ctype.h&...
0
votes
1
answer
80
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Question CS50 2021 Caesar - where is the bug?
I'm currently struggling with a bug in caesar pset2. If i use check 50 everything is green except:
:( encrypts "a" as "b" using 1 as key
output not valid ASCII text
:( ...
0
votes
2
answers
43
views
Caesar project: error: redefinition of 'i'
#include<stdio.h>
#include<cs50.h>
#include<string.h>
int main(void)
{
string name = get_string("Enter: ");
printf("%s\n",name);
int n = strlen(name);
printf(&...
0
votes
1
answer
22
views
How do I assign a variable to all possible values of another variable?
I hope my question was worded right but I'm trying to solved pset2 caesar and i don't understand how to print something only if all the possible values of a variable fit the condition. If I input &...
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0
votes
1
answer
39
views
Pset 2 - Validating the Key
I'm very new to all this and so am struggling a bit with the for loop. Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <cs50.h>
#include <string.h>
#include &...
- 3
0
votes
1
answer
20
views
substitution question segmentation fault issue
I am doing the substitution question and I keep running into this segmentation fault issue but i do not understand what exactly is causing the memory access issue. once j=4, the memory fails to be ...
0
votes
1
answer
22
views
Pset 2 ceaser problem
it,s compiling but it is not checking the words are digits or alphabets neither it is printing I included all the header files I don,t know what is going on.
0
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0
answers
30
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pset2 readability critique - how does my code look?
after struggling for days on end with scrabble, I decided to really spend my time consuming all the information possible from notes/lectures/shorts etc. Just finished readability only taking a few ...
1
vote
2
answers
54
views
cs50 readability problem set 2
I was wondering if someone could help me out with my code for the readability problem set. I have another solution but I was trying to make each process for counting letters, words and sentences ...
0
votes
0
answers
27
views
One last error in pset2 Caesar regarding key 65 (barfoo) - lost for how to fix!
I have read just about every question and answer to exist on the internet about this problem, rewatched lecture segments and walkthroughs, and done additional research on the functions used to try and ...
0
votes
1
answer
34
views
Why is it asking me to declare (s) when is has been declared already?
#include <stdio.h>
#include <cs50.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
bool is_valid_key(string s);
int main(int argc, string argv[])
{
if (...
- 3
0
votes
1
answer
52
views
Question on pset2 caesar - segmentation
I am really stuck on pset2 Caesar. I can compile it, but when I try to enter valid command line argument, it keeps on saying that I have a Segmentation fault. That seems to mean that I access memory ...
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0
votes
0
answers
32
views
Readability Pset2 - check50 multiple test fail
This is the code for readability problem set 2. The code is working but not properly as it's failing test cases. the output grade is either +-1 from the expected result.
Is there something wrong while ...
0
votes
2
answers
44
views
Caeser Pset2: Segmentation Fault
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <cs50.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
if ((int)...
0
votes
1
answer
35
views
PSET2 Substitution: Trouble only in encrypts all alphabetic characters using DWUSXNPQKEGCZFJBTLYROHIAVM as key
so this is my code. All problems are compiled successfully except this one. The output is "Segmentation fault"
this is my code:
#include <stdio.h>
#include <cs50.h>
#include <...
0
votes
1
answer
30
views
Pset 2 (Substitution), time out (handling of incorrect chars)
The below code lost a mark; check50 gave the explanation just below. A different time-out query (by Abhijit) appears to have had a different cause.
The check50 line used: check50 cs50/problems/2021/x/...
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0
votes
0
answers
30
views
error: address of stack memory associated with local variable
I have the following function:
string encipher( string plaintext, string key)
{
int size = strlen(plaintext);
char ciphertext[size];
// For each alphabetic charaters determine what letter ...
- 1
0
votes
1
answer
22
views
Pset 2 Substitution Segmentation Fault
I'm currently running into a segmentation fault when I don't put a key in the command line. I'm trying to say that if argc = 1 then "Please type key in command-line." but instead I'm getting ...
- 3
1
vote
1
answer
676
views
CS50 pset2 substitution - timed out while waiting for program to exit
I tried all the provided examples on the pset2 site, and I got all of them correct. But when I used check50 to check my code, it said: "timed out while waiting for program to exit" for some ...
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0
votes
1
answer
838
views
Error: format specifies type 'char' but the argument has type 'string'
This is the code written:
#include <stdio.h>
#include <cs50.h>
int main(void)
{
string name = get_string ("what is your name\n");
scanf("%s", &name);
printf("%...
0
votes
1
answer
24
views
Why does my code count a '.' only at the end of a multi-word string, but not at the end of a single word string?
I don't want my code to count non-alphabetic characters. It doesn't if they are alone, or at the end of a single word string. Why does it count an extra character at the end of a multi-word string or ...
- 14
0
votes
1
answer
28
views
CS50 Pset2 Readability Second Argument Not Compiling
#include<stdio.h>
#include<math.h>
#include<cs50.h>
#include<ctype.h>
//prototype for a custome function
int letters, words, sentences(string text);
int main(void)
{
// ...
0
votes
1
answer
42
views
Pset 2, readability: is everything a float and rounding problems
I' at the very end of readability and am having trouble getting the math correct and rounding it. I'm getting the correct letters, words and sentences, but am getting wildly wrong values for the grade ...
0
votes
1
answer
162
views
pset1 problem set 2 readability
I completed the code for pset1 problem set 2 readability as follows
#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
int ...
0
votes
1
answer
69
views
Caesar works as intended but check50 says it doesn't
I've tested all the possibilities where check50 says my code isn't working as intended and I always get the expected result.
I can't seem to figure out what I did wrong.
Here's check50:
:) caesar.c ...
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0
votes
1
answer
45
views
Hello everyone, i have a problem with my code for caesar
So when i run the following code in the caesar.c that is located in the caesar folder, it seems to run only for the very first character of the given plaintext and then the next characters are missing....
- 1
0
votes
2
answers
35
views
Char repetition in key
I 'm trying to avoid char repetition in key
// making chars array of alphabets
string alph = "abcdefghijklmnopqrstuvwxyz";
//making sure that there is no character repitition
char rep[26] = ...
0
votes
1
answer
47
views
Implementation problem
#include <stdio.h>
#include <ctype.h>
#include <cs50.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main(int count, string input[])
{
// ...
0
votes
1
answer
85
views
caesar pset2 "expected expression and use of undeclared identifier" error
When compiling this code getting mutltiple errors any idee why is the couse of these errors thanks.
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#...
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0
votes
1
answer
149
views
incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int'
I keep getting this error when I try to compile my program: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int'
{
if (argc != 2)
{
printf(&...
- 3