Thread: Need help with Snap card game loop.

Clue: "Newlines" ('\n'), are characters too. Pressing "enter" adds one. So what happens is the first scanf reads (for example) '3' into n, 'D' into s...
...then the next scanf reads '\n' into n, '3' into s
...then the next scanf reads 'D' into n, '\n' into s
...then the pattern starts again
Meaning you never get a correct correspondence.

You can get out of that by telling scanf to ignore a character:

Code:

scanf("%c%c%*c",&n,&s);

Notice the * which tells scanf to discard this item.

That will screw up too if the user accidentally leaves spaces at the end, so a more robust solution is:

Code:

char n, s, discard = 0;
[...]
scanf("%c%c",&n,&s);
while (discard != '\n') scanf("%c",&discard);

This will read the first two characters of input then chuck the rest up to and including the next newline. Important to discard to anything other than 10, which is the ASCII value for '\n'. If you don't know what ASCII character values are, they are numeric values representing the basic character set:

http://www.asciitable.com/

So, eg, 'A' == 65.