C: Prettyprinted Value aka Controlled Rounding

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

void fancy(long l, long nearest) {  char suffix[2] = "";  long mod, val = l;  float f;     if(val < 1500) /* Too small to pretty print. */  {   printf("%li B", val);  } else {   mod = val % nearest;   /* Where are we in the range? */   if(mod >= (nearest - mod))   { // hi - we are at or above the 50% of the [0-nearest[ range.    // add the difference to reach upper nearest.    val += (nearest - mod);   } else { // lo    // substract the difference to reach lower nearest.    val -= mod;   }       if(val < 1100000L)   {    f = (float)val / 1000;    suffix[0] = 'K';        } else if(val < 1100000000L)   {    f = (float)val / 1000000;    suffix[0] = 'M';   } else {    f = (float)val / 1000000000;    suffix[0] = 'G';   }       printf("%.2f %sB", f, suffix); // Here you can play with the format.  } }

Usage:

?

1 2	long size = 3141592535L; fancy(size, 1000);