Questions tagged [credit]
149
questions
0
votes
1
answer
33
views
Credit : the checksum is correct for <10 digits, but for14,15,16 digits getting negative checksum
The checksum is correct for less than 10 digits but for 14-16 digits it is coming back negative. What am I doing wrong?
#include <cs50.h>
#include <stdio.h>
#include <math.h>
int ...
0
votes
0
answers
29
views
What do you think about my code here?
#include <cs50.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
long long credit_num;
credit_num = get_long_long("credit number: "...
0
votes
1
answer
19
views
For Loop to look through all values of an Array
So, I am learning C using cs50 and a problem I have run into is that although i have yet to learn about arrays, I need to use arrays for my problem set. I would really appreciate it if someone could ...
- 3
0
votes
1
answer
23
views
How to Solve : expected identifier or '('
here is my code:
#include <stdio.h>
#include <cs50.h>
//Declaring User-Defined Functions
int last_digit(int sum3);
int main(void)
{
//Promting the user for credit card number
...
- 3
0
votes
0
answers
32
views
pset 1 credit 2022
At the outset, I want to say that I tried to complete this task with arrays and don't know how to make it witout them.
Here is my code:
#include <cs50.h>
#include <stdio.h>
int main(void)...
- 7
0
votes
2
answers
41
views
pset1-credit I can't find the issue with my code
the program prints invalid for valid card I know that my mistake is probably really dumb, but I can't find it (sorry for bad english)
#include <cs50.h>
#include <stdio.h>
int main(void)
{
...
- 3
0
votes
1
answer
38
views
pset1 credit 2023 , do while loop with arrays/intervals
#include <cs50.h>
#include <stdio.h>
int main(void)
{
long n;
do
{
n = get_long("13 digits or at max 15, 16 card number: ");
}
while(n < ...
- 7
0
votes
0
answers
15
views
Unpredictable counter behavior - pset1
I am working on the problem set 1, the credit problem.
My plan is to split the user entered number into individual digits, and put them in an array.
To start
int l = 0; // length of number
int count = ...
0
votes
1
answer
28
views
Getting "use of undeclared identifier" and can't solve it without ruining my code
i've been working on the mechanism to get every other number of the credit card number, and this is what i've come up with so far:
int get_credit(void);
int check_sum(int number, int a);
int ...
- 35
0
votes
1
answer
91
views
pset1:Credit (always outputs INVALID)
Whenever I input any card number into the program it outputs INVALID. I think the issue has something to do with not finding the first digits (int fdig) correctly because I used a print function ...
0
votes
1
answer
37
views
there is a logical error I can't really catch up with
Output:
Results for cs50/problems/2022/x/credit generated by check50 v3.3.7
:) credit.c exists
:) credit.c compiles
:) identifies 378282246310005 as AMEX
:) identifies 371449635398431 as AMEX
:) ...
0
votes
1
answer
44
views
Output problem credit
Finished my credit problem, whit the code below, but when I check it with check50 everything fails despite the output on the terminal being correct when I check manually.
Code:
#include <cs50.h>
...
- 1
0
votes
1
answer
93
views
credit.c I don't understand how to fix my code
I've been trying to figure out what's wrong with my code. I used printf so I could confirm whether or not the value of N is correct but it's coming out as completely different as what I would expect ...
- 1
0
votes
2
answers
107
views
Pset1 credit, checksum value gives wrong value
I find myself stuck on credit. Can't figure out where the problem lies in my logic. Checksum gives 4 where it should give out 0. Ideas appreciated.
//calculate checksum value
int sum1, ...
0
votes
1
answer
78
views
Week 1 - Problem concerning question on 'credit'
#include <cs50.h>
#include <stdio.h>
int main (void)
{
//User's Input
long n = get_long("Number: ");
int sum_of_odds = 0;
int sum_of_evens = 0;
int count = ...
0
votes
1
answer
131
views
CS50 problem set 1 CREDIT works sometime but not always
I am very new at coding and taking CS50. I am currently working on the credit problem in week 1. I finished coding but when I ran check 50 my code only seemed to work for some of the card numbers and ...
1
vote
1
answer
298
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 ...
0
votes
1
answer
123
views
Need help with the Credit Problem for Week 1
I have signed up for this year's CS50x, and I am stuck on the problem where we are meant to validate a credit card. The problem requires that we check the amount of digits, the first digits and use ...
- 1
0
votes
1
answer
34
views
Recalling the function for output changes the input
#include <stdio.h>
#include <cs50.h>
#include <math.h>
int procedure (int array[] , int length);
int input_length ( long input );
int main (void)
{
long card = get_long("...
- 86
0
votes
1
answer
66
views
credit pset1 cs50 sum while loop
I was doing the credit problem with the visa test card in the page: 4003600000000014
It passed that test, however in other tests it doesn't pass.
I think it's a matter of the sum that it can't compute ...
- 1
0
votes
1
answer
41
views
I have to enter any letter to get the result
I am currently doing the problem set 1 credit in cs50 program. I managed to write the code. It's compiles fine however once I enter the credit card number it stops, i must type any letter to get the ...
0
votes
1
answer
107
views
Credit Card Check
So I am on pset6 trying to implement the credit card check.
I've already completed working through the numbers and am not having any issue with the actual algorithm.
But for some reason my if ...
- 107
0
votes
1
answer
73
views
PSET 1 Credit Card Checksum doesn't add up
I'm having my issues finding the right answer as this is non code related.
The checksum says: "If the total’s last digit is 0, the number is valid!"
This is a credit card number that is ...
- 3
0
votes
1
answer
150
views
Credit (Pset1) - Checksum problem
so I have a problem with the Credit exercise from pset1. I updated my code today after realizing that I didn't split up the digits of the product of the current digit in the card number and 2 and ...
- 137
0
votes
1
answer
107
views
My do-while loop does not work
do
{
number = get_long_long("What is your credit card number? ");
}
while((number < 1000000000000) || (number >= 10000000000000000));
This loop is not accepting inputs. I do not ...
0
votes
1
answer
96
views
pset6 credit help with calculations in python
I am trying to convert my credit solution from C to python, but for some reason it is not working. Attached is my code and the problems
from cs50 import get_int
card, a, m, v = False, False, False, ...
- 5
0
votes
1
answer
47
views
Pset1 Credit - Why is my code bypassing the Floor function inside If statement?
Here's my code-
int f_1 = floor(N / 1000000000000000);
int f_2 = floor(N / 1000000000000);
int f_3 = floor(N / 100000000000000);
int f_4 = floor(N / 10000000000000);
if (...
0
votes
1
answer
81
views
pset1 credit: I am unable to identify what's wrong in the logic of my code?
Kindly tell me what mistake have I made in this program? pset1 Credit: (my code) https://pastebin.pl/view/5646dbf1
0
votes
1
answer
63
views
credit pset1 bruteforcing doesn't work
I was trying out credit and tried to write a code for all 15 digit cards so if a AMEX card exists it should work in theory. However even with valid cards I'm getting the input invalid. I have not ...
- 156
0
votes
0
answers
131
views
Can anyone help me troubleshoot my code for the CS50 Credit problem? (**not trying to cheat, just need some help!)
This is the code I have written in c for the cs50 credit pset 1 problem.
I am checking the length of numbers entered, and the first digits (AMEX 15 digits, starts with 34 or 37; MC 16 digits, starts ...
- 3
0
votes
1
answer
44
views
trouble summing the sides on credit
I have made it to the point it separates every digit into two sides so as to have two different sums, but then It gives me the wrong value of the sum. I'm pretty sure there is a bug in therms of it ...
- 107
0
votes
1
answer
91
views
Question about Pset1 - credit
I had work on the credit for 3 hours, and I had reach to most of the function - and I checked that the number received from:
Luhn (a)
last digit(c) and
digit count (cc)
are right by using ...
0
votes
1
answer
124
views
PSet1 Credit Invalid VISA that shows as Valid. My checksum must be wrong but dont know why
*/Here is the error I get:
:( identifies 4111111111111113 as INVALID
expected "INVALID\n", not "VISA\n"
:( identifies 4222222222223 as INVALID
expected "INVALID\n", not &...
- 1
0
votes
1
answer
75
views
PSET6 Credit - checksum not giving the correct number
list1 = list(input("Number: ").strip())
even_count, odd_count, count = 0, 0, 0
# if the length is even
if len(list1)%2 == 0:
# iterating each number in list
for num in list1:
...
0
votes
2
answers
115
views
PSET 1 Credit; Sometimes Check50 works and other times it doesn't
Why does Check50 work for certain credit numbers and not others? I ran debug and found that for some credit numbers and not others it may randomly be always one away from a multiple of 10 preventing ...
- 5
0
votes
1
answer
38
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>...
- 5
0
votes
1
answer
1k
views
I keep getting "expected EOF" when I use check50
this is the message
identifies 4111111111111113 as INVALID
expected EOF, not "INVALID"
this is the code
#include <cs50.h>
#include <stdio.h>
#include <string.h>
#include &...
- 31
0
votes
1
answer
207
views
My code is not compiling
my code isn't compiling and i don't understand the error message
#include <cs50.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
bool checksum(string credit);
...
- 31
0
votes
1
answer
29
views
When I multiply my array by 2 it doesn't give expected value
Also, please when I try to add "firstnumsum", it doesn't give expected value and I don't know what to do.
#include <cs50.h>
#include <stdio.h>
#include <string.h>
#include &...
- 31
0
votes
1
answer
92
views
i don't know what's wrong with my code. Trying to convert from string to long
INPUT
int main(void)
{
long long cardnumber, calc;
string credit[0];
string nonnumeric;
//long long calc = card number;
int countcardcharacters = 0;
long long c;
//user input
do
{
credit[0]= ...
- 31
1
vote
1
answer
32
views
Making code neater: a way to reduce repeated logical operators?
For CS50 pset1 Credit I'm using repeated logical-OR operators (||) to work out the validity and card brand of a credit card number. When I evaluate the style of my code using style50 it says to insert ...
- 15
0
votes
1
answer
706
views
How do you find the first digit of a long number?
I wrote the following code to try to find the first digit of a long number (this is for the CS50x "Credit" exercise), but it's not working. Any tips?
// Conditions and relational operators
#...
- 15
0
votes
1
answer
42
views
ProblemSet1 - Another Credit.c issue - Can't convert the floating value of my variables into an integer value
I was almost finishing my code when I got stuck with a strange problem. I've asked a question a few hours ago and someone answered, so I manage to fix that issue. But unfortunelly I got stuck in ...
- 5
0
votes
1
answer
39
views
ProblemSet1 - Credit.c - Issues assigning the sum of the numbers on a variable
So I coded the first lines of the Luhn's Algorithm and tried to print the values of some of my variables to be sure they were doing exactly what I want it. For my surprise they weren't. And I were ...
- 5
0
votes
1
answer
175
views
PSET1 - Credit: Check50 says wrong what should be right
Someone with the same problem? I have a 16 digit number starting with a 4 and my code identifies it correct as VISA\n, but the check50 says it has to be INVALID\n. What could cause this strange ...
- 3
0
votes
0
answers
90
views
I can't get the Luhn algorithm to run properly in my code
#include <stdio.h>
#include <cs50.h>
#include <math.h>
int main(void)
{
long long cardnumber = 0;
//Prompt the user for the credit card number using get_long
do
{
...
- 3
0
votes
1
answer
104
views
Need help (or idea) making the code looks cleaner. (PSET1/CREDIT)
My code passed pset1/credit but I still think the there must be a way to make my code looks cleaner and more impact. If you have any idea please criticize the code. Thank you in advance.
#include <...
0
votes
1
answer
86
views
HELP ME!! CS50 pset1 credit.c says INVALID but when I debug it says AMEX?
#include <stdio.h>
#include <cs50.h>
int main(void)
{
long long cc;
//get user input for cc
do
{
cc = get_long_long("Number: ");
} while (cc <= 0);
/...
0
votes
1
answer
49
views
CS50 Credit - again a scope problem
I think I almost finished the credit problem set, however, I have another scope problem. I think it is really simple.
After the checksum, the code is not working anymore. If I put extra braces by the ...
- 7
0
votes
2
answers
174
views
Credit pS1: how to store the separate digits and store them
I have made some progress, but I can't store the separated digits. It only stores the last one in "remain". My other challenge is that separating the digits above 9 gives the result "0&...
- 7