Round Up Floating Point

[kedaman]

ok I understand.

If you want an inline approach, this is the way:

double y=(int)(x*100.0)/100.0;

you power the radix by -decimal (a negative decimal gives precision lower than 1. Note the floating point division.

for variable radix or amount of decimals you can use this generic expression:

double z;
int r=10,d=2;
double y=(int)(x*(z=pow(r,d)))/z;

[jim mcnamara]

Here is another way, Kedaman's is more succinct

double roundup2(double f){
         double tmp;
         char t[20];
        char *stopstr;	
         tmp= 5 * pow(10,-3. );
         tmp += f;
         memset(t,'\0',sizeof(t) );
         sprintf(t,"%10.2f",tmp);  // << truncate the value and put in string
         return strtod(t,&stopstr);       //  << return a float from the string
}