Hacker News new | past | comments | ask | show | jobs | submit login

One small tip about printf for floating point numbers. In addition to "%f", you can also print them using "%g". While the precision specifier in %f refers to digits after the decimal period, in %g the precision refers to the number of significant digits. The %g version is also allowed to use exponential notation, which often results in more pleasant-looking output than %f.

   printf("%.4g", 1.125e10) --> 1.125e+10
   printf("%.4f", 1.125e10) --> 11250000000.0000

And %e always uses exponential notation. Then there's %a, which can be exact for binary floats.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact