Credit GetLongLong Issue

Question

I'm having issues using the GetLongLong function. For some reason the output I get doesn't match the input I put in. Here, is my code.

#include <studio.h>
#include <cs50.h>

int main(void)
{
    // Get credit card number
    printf("Number:");
    long long c_num = GetLongLong();
    printf("%llo/n", c_num);
}

The program appears to run fine, but when I input "1234567" as the number for GetLongLong, it returns "4553207" from the printf function. Does anyone know why it would do this? Am I using the GetLongLong function incorrectly?

Any help is appreciated.

Answer 1

No, you're using GetLongLong correctly not printing it correctly to stdout. "%llo" prints it in octal (i.e., base 8) instead of decimal (see more here https://www.cs.colostate.edu/~cs157/Fall15/Printf). Use "%lld" instead.

Also, /n simply prints /n. The newline character is '\n'.

ETA: there's a typo in your standard i/o library inclusion ("stdio.h" not "studio.h"), but stackexchange won't let me edit your post to correct just one character.