Questions tagged [week1]

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Week1 Cash problem scoping issue? Cents not updating

I have been trying to solve the cash problem but i think i'm running into problems with scoping between prototype, main and function updating the cents variable. I have tried a variety of variations ...
Berry6400's user avatar
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1 answer
16 views

Cs50 week 1 problem (make: *** [ ] Error 1)

please I need some help to understand this error im I doing smth wrong ?
Firas Elechi's user avatar
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1 answer
44 views

Week-1 problem set credit

I have started taking the CS5 lessons and while I run my code for the week-1 credit problem, the terminal always shows the output as "INVALID" or anything that I insert in the second last ...
SPCS50's user avatar
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1 answer
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Can't seem to get total number of years to print properly in Lab 1

I'm new to coding and I've been having trouble with Lab 1. I was able to get the program to properly ask for a start and end size, but the number of years is not listed. Here's an example: population/ ...
Kbluhawk's user avatar
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1 answer
243 views

What is the meaning of ”can't check until a frown turns upside down“?

This is my code for the CS50 week 1 homework called Meal time and it can work correctlt. def convert(time): y,z = time.split(":") y=float(y) z=float(z) time=y+z/60 return(time) def main(): ...
Ling Captain's user avatar
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2 answers
60 views

I want to understand the int data type. Why is the range 2^-31 to 2^31 - 1 when there are total 32 bits only. Should it not be 2^-16 to 2^16-1?

So my question may be very basic. But I am pretty new to computers. If there are 32 bits in the int data type then it means there are 32 places where we can write either a zero or a one (if I am ...
Abhinay Kumar Singh's user avatar
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4 answers
2k views

Cant get Codespace to work

Im up to the "Hello" module, week 1. Ive never programmed before so setting up copespace has been quite frustrating. I cannot get it to work. Can someone please help me? I want to get ...
Tamz Hamz's user avatar
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1 answer
27 views

week 1 no workspace?

I'm trying to get through the first 15minute of the lecture and already lost :( I tried to go through other questions that recommends to find the right ~workspace and ~pset1 but I don't know how to go ...
Clo Park's user avatar
1 vote
1 answer
324 views

problem with credit with this numbers (369421438430814 & 5673598276138003)

I just finished solving the credit problem and regularly used check50 to see my results, and then this happened. check50 sees that these numbers : 369421438430814 5673598276138003 are invalid, even ...
Yassen Redwan's user avatar
0 votes
1 answer
162 views

I don't understand the comments from check50 on my lab 1 submission. could anyone help please?

This is my code #include <cs50.h> #include <stdio.h> int main(void) { // TODO: Prompt for start size int s; do { s= get_int("Start size: "); } ...
Aya Othman's user avatar
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1 answer
47 views

No such directory - Week 1

I am unsure why my mario.c and mario are not showing up as directories? I am sure this is a very simple fix. However, I seem to be at a loss of what to do! I would appreciate any feedback! Thank you!!
hudsonmae's user avatar
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1 answer
601 views

Why do I get this "expected expression" error?

Like mentioned in the title, I get this "expected expression" error when I try to convert my amount from float into int type. Am I doing the conversion wrong ? Or is there something else I'm ...
Nomad's user avatar
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1 answer
39 views

Week 1 Credit; Not Creating Variable

I'm starting the week 1 credit problem, however, when trying to set together every second digit it simply does not print. Could you help me identify where I went wrong? Thanks! #include <stdio.h>...
Anon's user avatar
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2 answers
560 views

how do i write pesudocode.txt for Mario? (less comfortable)

After I input: mkdir ~/pset1/mario its asking me to write pseudocode.txt and i am not sure how i can do that. I've tried inputting the pseudocode.txt and that gives me "command not found"
Iris A San Juan's user avatar
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2 answers
78 views

Else If Boolean Statements of Equality In the Case of Complex Numbers

In the lecture for Week 1, Professor Malan said that in an if statement, the third boolean expression (else if (x ==y)) is redundant or implied, since logically, if it is false that a number is ...
Varsha 's user avatar
1 vote
1 answer
130 views

Cant get past the ls command in hello.c

I cant get past the List command in hello.c, and i'm not sure if i'm supposed to get something in the terminal after i type in ls, so i kept going and typed clang and i get the error message. I've ...
Iris A San Juan's user avatar
0 votes
1 answer
79 views

Prompt a user for a number. My code has an endless loop

i am trying to build a code in which the user should input a number between 1-5. In any other case the program should request the user to input a new number. My problem is that the program is going ...
VAPORAS's user avatar
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1 answer
163 views

Credit.c works, but not completely?

So I finished credit.c today and was trying out different numbers from the paypal website the course provided and got some unexpected results and don't know what to do with it. When I type in valid ...
xbufu's user avatar
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1 answer
580 views

Can't use get_long_long();

So somehow I cant use the get_long_long(); function. It lets me declare the variable, but I cant get any user input for it. Here's my code: #include <stdio.h> #include <cs50.h> #include &...
xbufu's user avatar
  • 107
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1 answer
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Transform function into a loop or similar

So my problem is in problem set 1 of week 1 of the CS50 Harvard course. The task was writing a program that calculates the smallest amount of coins possible when getting change. I've already written ...
xbufu's user avatar
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1 answer
201 views

Week 1 cash.c assignment: How can I get a variable to mutate as it gets operated on?

the way my code works is to reduce c as we count out coin-types. But I'm getting errors. #include <cs50.h> #include <stdio.h> int main(void) { float c; do { ...
EB Gold's user avatar
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1 answer
462 views

get_int variable in mario causing errors

Hi I'm getting an error that says "x" is an unused variable. And I'm also getting errors every time I try to use "x". I have reviewed David's get_int example from Lecture 1: int main(void) { ...
EB Gold's user avatar
0 votes
3 answers
4k views

Week 1: get_int & get_string errors

Fro the files int.c and string.c, I copied the code from the lecture exactly, and was receiving errors, then modified the code according to suggestions online by adding #include <cs50.h>and I'm ...
Xia Liu's user avatar
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1 answer
1k views

Switch(c) undeclared identifier

I am trying to compile the example codes from the shorts with Doug Lloyd. I was putting together the switch.c example, and there seems to be a problem with the c of switch (c). Here is what I have. ...
Kelsey M. Hill's user avatar
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1 answer
64 views

Can't compile adder from week 1

im trying to compile my program but a problem keeps popping up and i cant seem to understand why. Here's the program and the problem.
Daniel Dimitriou's user avatar
3 votes
1 answer
892 views

Week 1 compiling String.c using clang instead of make

in week 1 as I understood : make= compile the file and name the compiled file with the same name. clang= compile the file with the default name. when I've used make it worked and when I used clang it ...
Yousef Gamal's user avatar
-1 votes
2 answers
74 views

Week 1 : After using the cp command and copying the file, the duplicate file does not run and prompt appears saying "Nothing can be done"

Week 1 : After copying a file, can a duplicate file be compiled and run?
Pragya's user avatar
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2 answers
137 views

Can we use math.h and strings.h for credit.c

I can only think of ways to do credit.h using functions from string.h and math.h, but they're not covered in the week's lecture. Are we allowed to use them?
Aryan poonacha's user avatar
0 votes
1 answer
448 views

the inbuilt cs50's library functions not working

For god sake this one isn't working. Can anybody help? Thanks in advance #include <stdio.h> #include <cs50.h> int main(void) { string s = get_string(); printf("Hello, %s\n", s); }...
nkrm's user avatar
  • 3
0 votes
1 answer
116 views

week 1 string.c errors

I am going through week 1, and once I enter this: #include <cs50.h> #include <stdio.h> int main(void) { string name = get_string(); ...
Gulce's user avatar
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1 answer
516 views

CS50 PSET 1 Hacker Bad Credit Code

The goal is to find if a credit card number is valid. Complete Instructions Here: https://cdn.cs50.net/2015/x/psets/1/hacker1/hacker1.html#bad_credit Can I please know what makes my code fail? (I ...
KhalidMukadam's user avatar
0 votes
2 answers
29 views

Not a problem set, but a question about the "sizeof" example from week 1 walkthroughs

I've been trying to follow along with all the examples in the walkthrough and there's something that I can't get to work and I can't for the life of me figure out WHY I keep getting this error message....
Maria Andrea's user avatar
0 votes
1 answer
55 views

Last program from the first half of the lecture in week one?

I tried to run the last program from the first lecture video of week 1, and I got this error: clang -ggdb3 -O0 -std=c11 -Wall -Werror pain.c -lcs50 -lm -o pain pain.c:61:1: error: type specifier ...
tox123's user avatar
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1 answer
52 views

Why does PrintName return void?

Okay so in the PrintName function, it contains a printf function. However, I read that printf returns a value which is the number of characters. Shouldn't PrintName hence return an int as well? Thanks!...
user107224's user avatar
-1 votes
1 answer
162 views

How to fix the "nothing to make" error? [duplicate]

I just made a new file called mickey.c (basically a version of hello.c). I went into the directory and executed the command make mickey.c it says "nothing to make". here is the output from terminal:...
The Realmccoy's user avatar
0 votes
1 answer
66 views

Trying to change directory in week1 example hello1.c

I am trying to change directory in week1 tutorial example hello1.c, but its showing an error message bash: cd: dropbox: No such file or directory
joseph's user avatar
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0 votes
1 answer
42 views

why is no "\n" needed after GetString?

Watching the first week 1 lecture, they went over how you need "\n" to print a new line. However in the example: { printf("Your name please: "); string s = GetString(); printf("hello, %s\...
lawcooper's user avatar
0 votes
1 answer
1k views

How should I take notes for the lectures?

learners! I'm glad to be a part of this community. About our course, CS50, I was frustrated because in our university we didn't learn how we could take notes from the course. Our instructors start ...
Hadjomar Sayah's user avatar
0 votes
1 answer
74 views

CS50 Appliance compiling error!

Just started cs50 on edx a week ago. Just finishing the walkthroughs for Week 1. In the walkthroughs, there is a one video about "Switch" and "Cases". Ive written the code correctly, I think, but ...
Jayadev Sreevallabhan's user avatar
0 votes
2 answers
529 views

Week 1 - Conditions - error expression result unused (expect ; at end of if else)

Error: expected expression (see photo) It's a very basic program and I'm sure I've made a simple syntax error. There shouldn't be a ";" at the end of the else line and I have included the ; at the ...
Ross Webster-Salter's user avatar
0 votes
1 answer
62 views

week 1 get 4 errors when compiling hello-1

I keep getting the following 4 errors when I try to make hello-1
kabasky's user avatar
0 votes
1 answer
327 views

The compiler Clang isn't showing

The compiler Clang isn't showing and I'm at a complete lost of why it isn't. Please help me. bash: clang: command not found cs50
Stacey's user avatar
  • 1
0 votes
0 answers
59 views

Why is -ls stdio.h not used?

During the Week 1 lecture continued at approximately 31 mins in the instructor talks about telling clang to link cs50 into his program. I was wondering why you don't need to tell clang to link in to ...
JesseJayne's user avatar
0 votes
1 answer
879 views

Permission Denied in pset1

I am stuck in week 1 lectures. Initially after watching the videos I was able to run the codes, 'make hello' and './hello.c', then after an update to the CS50 appliance the codes wouldn't run any ...
Hakeem Ajibolu's user avatar
0 votes
1 answer
41 views

Where can I download "src1m" folder of files used in week 1 lecture?

I want to download and run the files David used in the week 1 lecture, the folder's titled 'src1m'.
Hakeem Ajibolu's user avatar
2 votes
1 answer
3k views

Why do I not have to link stdio.h while compiling with clang?

To compile this source code with clang, we had to link "cs50" library like this: clang hello.c -lcs50 but we did not have to link "stdio". why? /* hello.c */ #include <stdio.h> #include <...
Hakan As's user avatar
0 votes
2 answers
405 views

CS50 commands, standard commands - is there any literature and who did that? [closed]

I am on week 1 and it is a lot frustrating to me. I certainly am not good with computers. When in first part of the lecture, teacher says things such as someone invented it, computer looks for it... I ...
Innochka 's user avatar
0 votes
2 answers
1k views

Do we need to return 0 in C?

I found a lot of C tutorials on the internet ending their main functions with return 0;, but I don't see David doing that. Can anyone explain to me please? I've only finished watching Week 1 lectures ...
Prakrit Duangsutha's user avatar
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0 answers
46 views

Pset0 isn't under Week 0 but, Week 1. Bug? [duplicate]

The Problem Set 0 which was previously under Week 0 is now displaying under Week 1. Week 0 does not display any Problem Set, and the Problem Set of Week 1 shows under Week 2? Is this some kind of bug ...
Adivir's user avatar
  • 1
0 votes
1 answer
53 views

Trying to compile f2c.c from walkthrough week1 without success [duplicate]

I'm trying to compile the programming from the walkthrough week1 f2c but it doesn't work. I don't know what I'm doing wrong. When I type in "make f2c" it returns *** No rule to make target `f2c'. ...
Socratesloco's user avatar