Approximating the number

[alphabeta]

if I want to approximate the out put to the first 3 decimals in C++ how should I write it !? 

[yuh25]

Been doing this while learning OpenGL to output to the console. Not sure if it will work in your case but:

printf("%1.3f",value); //#.###

http://www.cplusplus.com/reference/cstdio/printf/