How can i make rounding?

[Guest_imported]

Good afternoon,
i have a problem. i don't know the function to make a rounding. for example, i have a const = 4,1234
there is a function to obtain 4,12 ?
can i decide how many decimals i want?
Best regards and thank you very much!
Michele

p.s. my problem isn't a video format but if i must make any mathematical operation.

 

[hnd]

float a;
int a1;

a=4.12345; // may be any positive value
a=(4.1234*100+0.5); //value of a = 412.84
a1=a; // a1=412 because of type conversion
a=a1/100; // a=4.12;
hnd
hasso55@yahoo.com

 

[Zyrenthian]

int round(int value, int decimalPlace)
{
int roundOff = 10*decimalPlace;

if(roundOff > value)
return 0;

int roundUpOrDown = ((value % roundOff)/(roundOff/10)) >= 5 ? 1:0;

return value%roundOff + roundoff*roundUpOrDown;
}


that should do your rounding for integer values... for decimals, see what hnd did above and combine it with this

Matt

 

[Zyrenthian]

int round(int value, int decimalPlace)
{
int roundOff = 10*decimalPlace;

if(roundOff > value)
return 0;

int roundUpOrDown = ((value % roundOff)/(roundOff/10)) >= 5 ? 1:0;

return value - (value%roundOff) + roundoff*roundUpOrDown;
}

// sorry if this is a double post... i clicked submit before realizing i forgot one important thing. If this is not a double post please disregard this

that should do your rounding for integer values... for decimals, see what hnd did above and combine it with this

Matt