check50

cs50/problems/2026/x/credit

:) credit.c exists

Log checking that credit.c exists...

:) credit.c compiles

Log running clang credit.c -o credit -std=c11 -ggdb -lm -lcs50...

:( identifies 378282246310005 as AMEX

Cause
expected: "AMEX\n" actual: "INVALID\n"

Log running ./credit... sending input 378282246310005... checking for output "AMEX\n"...

Expected Output:

"AMEX\n"

Actual Output:

"INVALID\n"

:( identifies 371449635398431 as AMEX

Cause
expected: "AMEX\n" actual: "INVALID\n"

Log running ./credit... sending input 371449635398431... checking for output "AMEX\n"...

Expected Output:

"AMEX\n"

Actual Output:

"INVALID\n"

:) identifies 5555555555554444 as MASTERCARD

Log running ./credit... sending input 5555555555554444... checking for output "MASTERCARD\n"... checking for EOF... checking that program exited with status 0...

:) identifies 5105105105105100 as MASTERCARD

Log running ./credit... sending input 5105105105105100... checking for output "MASTERCARD\n"... checking for EOF... checking that program exited with status 0...

:) identifies 4111111111111111 as VISA

Log running ./credit... sending input 4111111111111111... checking for output "VISA\n"... checking for EOF... checking that program exited with status 0...

:) identifies 4012888888881881 as VISA

Log running ./credit... sending input 4012888888881881... checking for output "VISA\n"... checking for EOF... checking that program exited with status 0...

:( identifies 4222222222222 as VISA

Cause
expected: "VISA\n" actual: "INVALID\n"

Log running ./credit... sending input 4222222222222... checking for output "VISA\n"...

Expected Output:

"VISA\n"

Actual Output:

"INVALID\n"

:) identifies 1234567890 as INVALID (invalid length, checksum, identifying digits)

Log running ./credit... sending input 1234567890... checking for output "INVALID\n"... checking for EOF... checking that program exited with status 0...

:) identifies 369421438430814 as INVALID (invalid identifying digits)

Log running ./credit... sending input 369421438430814... checking for output "INVALID\n"... checking for EOF... checking that program exited with status 0...

:( identifies 4062901840 as INVALID (invalid length)

Cause
expected: "INVALID\n" actual: ""

Log running ./credit... sending input 4062901840... checking for output "INVALID\n"...

Expected Output:

"INVALID\n"

Actual Output:

""

:( identifies 5673598276138003 as INVALID (invalid identifying digits)

Cause
expected: "INVALID\n" actual: "MASTERCARD..."

Log running ./credit... sending input 5673598276138003... checking for output "INVALID\n"...

Expected Output:

"INVALID\n"

Actual Output:

"MASTERCARD..."

:) identifies 4111111111111113 as INVALID (invalid checksum)

Log running ./credit... sending input 4111111111111113... checking for output "INVALID\n"... checking for EOF... checking that program exited with status 0...

:) identifies 4222222222223 as INVALID (invalid checksum)

Log running ./credit... sending input 4222222222223... checking for output "INVALID\n"... checking for EOF... checking that program exited with status 0...

:( identifies 3400000000000620 as INVALID (AMEX identifying digits, VISA/Mastercard length)

Cause
expected: "INVALID\n" actual: "MASTERCARD..."

Log running ./credit... sending input 3400000000000620... checking for output "INVALID\n"...

Expected Output:

"INVALID\n"

Actual Output:

"MASTERCARD..."

:) identifies 430000000000000 as INVALID (VISA identifying digits, AMEX length)

Log running ./credit... sending input 430000000000000... checking for output "INVALID\n"... checking for EOF... checking that program exited with status 0...