Help needed to round-off a number
Tom Stockfisch
tps at chem.ucsd.edu
Sun May 21 11:40:57 AEST 1989
In article <2666 at oregon.uoregon.edu> michelbi at oregon.uoregon.edu (Michel Biedermann) writes:
>Is there a C function (user defined or primitive (?)) that will let me
>truncate or round-off a number UP TO a certain decimal place. For example
>transforming .567 into .6 or -1.502 into -1.5.
If speed isn't crucial, use
double
round( x, sigfigs )
double x;
int sigfigs;
{
char buf[sizeof(double)*20]; /* nice conservative size */
sprintf( buf, "%.*g", x, sigfigs );
sscanf( buf, "%lf", &x );
return x;
}
--
|| Tom Stockfisch, UCSD Chemistry tps at chem.ucsd.edu
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