2
votes
error at while loop cs50 Pset1 credit
The compiler is actually giving a warning, but the compiler flags are set up to treat all warnings as errors. It's still best to eliminate all warnings.
Here's the reason. For clarity, let's ...
- 67.4k
2
votes
Credit Problem: what does "number’s second-to-last digit" mean?
Agreed that the example used can be ambiguous. We have updated the AP Credit problem spec with a better example that makes it clear that you must start from the last digit (and the first number to be ...
- 18.5k
2
votes
Credit Problem: what does "number’s second-to-last digit" mean?
For the sake of discussion, let’s first underline every other digit,
starting with the number’s second-to-last digit:
378282246310005
Second to last digit is the digit before the last digit, in ...
- 67.4k
2
votes
Accepted
Credit.c is my nemesis
Your counting loop destroys the number. Destroy a copy instead.
And stack variables are not initialised by default, so you end up with some arbitrary data as the array isn't filled at all due to your ...
- 20.9k
1
vote
pset1 Credit: how to write it shorter
Edit to rephrase, I hope this one is ok with the admin.
Operate on a copy of the number (so that you can use the number later for other things). Use a loop, can be a pretty simple while loop, and ...
- 20.9k
1
vote
Accepted
Credit task problem
One of the hidden lessons in the first few psets is to write to the specification exactly. That means that anything extra, missing or misplaced, including prompts, output, whitespace, line feeds, ...
- 67.4k
1
vote
credit.c I don't understand how to fix my code
It looks like you expect ^ to do exponentiation. It doesn't; it is the Bitwise XOR operator in C. You can use the pow function in the math library instead.
- 27.6k
1
vote
Accepted
credit pset1 bruteforcing doesn't work
This is because you've overlooked an important piece of information provided with the explanation of Luhn's algorithm. It actually says in the algorithm to add the products' digits to the checksum and ...
- 126
1
vote
Accepted
ProblemSet1 - Another Credit.c issue - Can't convert the floating value of my variables into an integer value
Having problems with this?
temp_b /= (10 ^ 14);
That would be because the ^ operator is not an exponent operator as it is in mathematics. It's the exclusive or operator. You might try a call to pow()....
- 67.4k
1
vote
Accepted
ProblemSet1 - Credit.c - Issues assigning the sum of the numbers on a variable
When you say number /= 10, you are actually reducing the number variable itself.
So after counting and getting the value for count, the value of number is equal to zero
- 26
1
vote
Accepted
cs50 pset1 credit expected expression error
Look at the line in question:
if(askPositiveLong >= 340000000000000 && askPositiveLong < 350000000000000)
|| (askPositiveLong >= 370000000000000 && askPositiveLong < ...
- 67.4k
1
vote
Credit.c is my nemesis
I got you, man. A little more experience with programming and you'll get there. Try including math.h and using some of its methods for counting and sorting through the digits. Here's my code as an ...
- 11
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