# Questions tagged [pset1-credit]

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### Pset1- Credit: Length of the number by continuously dividing by 10

// Get card number long n = get_long("Number: "); // Count length int i = 0; long cc = n; while (cc > 0) { cc = cc / 10; i++; } Source: https://medium.com/swlh/cs50-pset-1-credit-...
1 vote
165 views

### error at while loop cs50 Pset1 credit

I am getting an error at while loop it says error: '&&' within '||' [-Werror,-Wlogical-op-parentheses] while((credit % 10 >= 0) && (i < 15) || (i < 16)) here is my ...
1 vote
47 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 ...
1 vote
65 views

### Function in C: How to create

#include <stdio.h> #include <cs50.h> int main(void) { long creditcardno; do { creditcardno = get_long("enter"); } while (creditcardno < 0); } The above code accepts ...
1 vote
111 views

### cs50 pset1 credit expected expression error

So, I have gotten rid of all the errors and got the code to the point to prompt the user for the credit card number and output an answer the only problem is the program falls thru to invalid every ...
• 15
282 views

### Could not find the following in the output: <class 'pexpect.exceptions.EOF'>

#include <stdio.h> #include <cs50.h> int main(void) { long creditcardno; do { creditcardno = get_long("enter"); if (creditcardno < 999999999999 || creditcardno ...
44 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) { ...
26 views

### I'm getting a floating point exception error in the credit code but I definitely haven't divided by 0

Here is the code: int sum1(long long n) { int sum1 = 0; int x = 0; for (long long i = 100; (n % i) <= n; i *= 100) { x = 2 * ( ( (n % i) - (n % (i / 10)) ) / (i / 10) ); ...
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 :) ...
152 views

### Dealing with pset1's "credit" problem

I was trying to solve this problem. I did some coding: #include <cs50.h> #include <stdio.h> int get_digit_number(long card_number); int main(void){ bool valid; long card = get_long(&...
31 views

### Need Help, why does my debug50 show a correct result but when i run the program, thus it shows a wrong answer

Here's my code #include <cs50.h> #include <stdio.h> #include <math.h> //1:26:36 / 2:24:59 int main(void) { long n; int exc; do { n = get_long("Enter your ...
97 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 ...
75 views

### CS50 Credit Pset problem- Code keeps looping back to ask for the credit card number

The following is my code for the Credit Pset from week 1 of CS50, it is not the complete solution to the problem (all the code does (rather is supposed to do) is for the user to enter a credit card ...
• 3
23 views

### Credit problem: Opening parentheses not matched with closing

Though it might appear annoying, the program not compiling. To the best of my understanding, there is a closing parenthesis on line 37. Is it some cache related issue? https://drive.google.com/file/d/...
102 views

### Credit card problem: Unable to calculate the sum of entered credit card no

#include <stdio.h> #include <cs50.h> int main(void) { long creditcardno; do { creditcardno = get_long("enter"); } while (creditcardno < 1000000000000 || creditcardno > ...
14 views

### Unable to move to the next chunk of the problem

#include <stdio.h> #include <cs50.h> int main(void) { long creditcardno; do { creditcardno = get_long("enter"); } while (creditcardno < 1000000000000 || creditcardno > ...
75 views

### Do-while code for long integer input

It is mentioned in the problem: American Express uses 15-digit numbers, MasterCard uses 16-digit numbers, and Visa uses 13- and 16-digit numbers. So with get_long, I perhaps need to restrict input ...
116 views

### Segmentation Fault for PSet1 Credit in CS50

first time posting. I swear I looked for answers in other segmentation fault questions already, but I am new to programming and to troubleshooting/researching effectively. My PSet1 program "...
28 views

### expected expression error in pset1 credit for loop

I am getting a error in the following line long checksum = (long) for (int i=1; i < 8; i=i+2) { if (checksum > 9) { (((long) 2*(credit_number % (long) ...
52 views

### Stuck with pset1 credit question. I don't know why I'm not able to get any "Valid" outputs when a valid card number is entered

#include <stdio.h> #include <cs50.h> #include <math.h> #include <stdlib.h> int main (void) { int count = 0; //Declare counter //Get input from user long number = get_long (&...
177 views

### PSET 1 Credit AMEX

I've calculated the Luhn's algorithm for all the credit cards and it works fine. The only issue I have is that the American Express cards which are tested don't fulfill the Luhn's algorithm! This is ...
2k views

### How To Use a For Loop To Store Values Into Multiple Variables?

I'm working on the Credit problem set. Along the way, I've encountered a scenario where I want to use a for loop to store multiple values. If I type printf("%d", cc_number[p]); in that for loop, it ...
16 views

### can anyone help error check my luhns algorithm code?

i wrote this version of the credit card number checking code and it still gives me an error when i check it. apparently, it validates 4111111111111113 and 4222222222223 as visa numbers when theyre not....
• 1
25 views

### PSET 1 - Credit, Mastercard validation failing

Trying to solve the Credit Question in PSET1, unable to get the mastercard number to validate. Attaching the code #include <cs50.h> #include <stdio.h> long get_card(void); int card_length(...
47 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 ...
116 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 ...
49 views

### Cs50 pset1 problem credit

I'm not able to take out the second digit of the credit number, how to do it for large numbers like 16 digit,15digit,14 digit?
142 views

### Pset1:credit - converting a long to a string causes a segfault?

I keep getting a segfault, and help50 doesn't help. A lot of head scratching an googling later, I think I've narrowed it down to: you can't convert a long to a string. Is that true? The code in ...
64 views

These are the test cases which my code doesn't satisfy ,can someone please help me out as i have absolutely no idea why it is happening. Some tips or advice would be handy. Thank you in advance. :( ...
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 (...
77 views

### Pset1 Credit- How should I proceed to add the sum of multiplied digits & further addition with remaining credit card numbers?

I can pretty much select the digits, multiply the digits by 2 & add the particular digits of the multiplied number. But as of now I can only print them not add them. I also have to add this sum to ...
136 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 ...
1k 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 #...
160 views

### trying to check second to last digit-- cs50 pset 1 #credit#

I am trying to understand the second to last digit thing, i think i have been coding wrong the whole time. take this example 45002136581 in the walk through the guy says we take 5 0 2 1 5 1. while i ...