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What version of the CS50 IDE? You can see it in the top right next to the cloud9 icon, or run version50. Current version is 94 (as of this writing). get_string() was introduced recently, for the CS50x …

This is a great course, and if you are interested in learning C, I strongly recommend it. You can sign up here at edx.org. There is an option to audit the course. … C is a strongly typed language, and as such it is not possible to create variable names dynamically. …

When the user chooses an option (w), they have type two characters: the option and enter. You need to "consume" the enter from stdin lest it be assigned to q. Reference this SO post or this one.

One issue is here: // stop on newline if (chr == '\n') break; When the input is "enter", the for loop "breaks", and is done. The dilemma: how to enter a list of numbers, when y …

This int printf(const char *format, ...); is the function signature of printf. The ... represents the data arguments used by the format. Since argv[1] is the argument for %s in the format, it needs t …

The "slug" refers to the command line argument supplied to cs50, not to anything in the code. The command from the spec is check50 cs50/problems/2020/x/readability Verify it is typed correctly (or …

This answer: If you have locate command available you can simply use locate: -bash-3.2$ locate sys/types.h /usr/include/sys/types.h /usr/lib/syslinux/com32/include/sys/types.h -bash-3.2 …

Welcome to the wonderful, wacky, wtf world of memory leak! This allocation char title[7]; is causing the problem. This sprintf(title, "00%i.jpg", jpgCount); is stomping on jpgCount's memory. How so? L …

At least two things going on here. First, unless I've misread something, this else if (board[i+1][j] == -1) will never be true (nor any of the else that compare a board location to -1). All of the i …

You have changed the board logging routine and that is what check50 is complaining about. check50 depends on that output (log.txt) to verify the result. Here is the routine from the distribution code: …

If you are doing "more" version, you'll likely run into trouble here printf("%c", toupper(name[i])); (the first one). When it executes that line, i = 0. If name[i] is space, it will print space. …

This !isalpha(argv[1][0]) is only testing the first character of argv[1]. Your statement "The check50 checks expect the key to be iterated through then immediately rejected" is quite true. The program …

int is matching on in. org is matching on or. Why? Because it is checking is_word on the second-to-last letter. When check process the t in int, it will not move crawler because of if(word[i+1] != '\0 …

There's a couple of problems. First, height is essentially a constant after it is entered by the user. It represents the number of rows to print, and as such, shouldn't be changed by the program. It …

If you look into the large dictionary, you will discover "i" is the first i entry and "ca" is the first c entry. cursor->word is always the first entry. What happens with "is"? …