Question

I have a float value: (data->val) which could be of three possible float precisions: %.1f, %.2f and %.3f how would I format it using CString::Format to dsiplay only the number of decimal points necessary? eg:

CString sVal;

sVal.Format(L"%.<WHAT GOES HERE?>f", data->val);
if(stValue)
    stValue->SetWindowText(sVal);

As in I don’t want any additional zeros on the end of my formatted string.

Answer 1

If you know the precision you’d like simply use %.*f and supply the precision as an integer argument to CString::Format. If you’d like the simplest effective representation, try %g:

int precision = 2; // whatever you figure the precision to be
sVal.Format(L"%.*f", precision, data->val);
// likely better: sVal.Format(L"%g", data->val);