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Question: What Comes After The %?


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I've searched for this a little but I have not gotten a particularly straight answer. In C (and I guess C++), how do you determine what comes after the % when using printf?. For example:

double radius = 1.0;
double area = 0.0;
area = calculateArea( radius );
printf( "%10.1f     %10.2\n", radius, area );

I took this example straight from a book that I have on the C language. This does not make sense to me at all. Where do you come up with 10.1f and 10.2f? Could someone please explain this?

Question author The-anti-9 | Source

Answer


1


http://en.wikipedia.org/wiki/Printf#printf_format_placeholders is Wikipedia's reference for format placeholders in printf. http://www.cplusplus.com/reference/clibrary/cstdio/printf.html is also helpful

Basically in a simple form it's %[width].[precision][type]. Width allows you to make sure that the variable which is being printed is at least a certain length (useful for tables etc). Precision allows you to specify the precision a number is printed to (eg. decimal places etc) and the informs C/C++ what the variable you've given it is (character, integer, double etc).

Hope this helps

UPDATE:

To clarify using your examples:

printf( "%10.1f     %10.2\n", radius, area );

%10.1f (referring to the first argument: radius) means make it 10 characters long (ie. pad with spaces), and print it as a float with one decimal place.

%10.2 (referring to the second argument: area) means make it 10 character long (as above) and print with two decimal places.

Answer author Robintw

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