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  1. #include <stdio.h>
  2. #include <math.h>
  3. char toNotationUnit(double value,float *out) {
  4.         double val;
  5. 		char notacoes[] = {'y','z','a','f','p','n','u','m',' ','k','M','G','T','P','E','Z','Y'};
  6.         int counter=8;
  7.         char unit;
  8.         val = value>0?value:-value;
  9.         if(val < 1) {
  10.                 while( (val < 1.00) & (counter != 0)) {
  11.                         counter--;
  12.                         val=val*(double)1000;
  13.                 }
  14.         }else{
  15.                 while((val >= 1000) & (counter != 16)) {
  16.                         counter++;
  17.                         val=val/(double)1000;
  18.                 }
  19.         }
  20.         unit = notacoes[counter];
  21.         val = round(val*(double)100)/(double)100;
  22.         *out = (float) value>0?val:-val;
  23.         return unit;
  24. }
  25.  
  26. int main() {
  27.   double x = -1230000;
  28.   float res;
  29.   char t;
  30.   t = toNotationUnit(x,&res);
  31.   printf("%.2F%c",res,t);
  32.   return 0;
  33. }
stdin
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Standard input is empty
compilation info 
prog.c: In function ‘toNotationUnit’:
prog.c:21: warning: implicit declaration of function ‘round’
prog.c:21: warning: incompatible implicit declaration of built-in function ‘round’
stdout
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-1.23M
https://ideone.com/wpvZo
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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