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MISRA violation "441 - Float cast to non-float "

I am trying to correct the MISRA violation "441 - Float cast to non-float" that is occurring with the following code:

tULong frames = (tULong)(runTimeSeconds * 40.0f);

runTimeSeconds is a float and obviously 40.0f is assigned as a float. Any ideas?

Solution

  • <math.h> has a nice family of functions that round and convert in one call. No cast needed to convert from float to tULong. Below has a (tULong) cast to handle an integer to integer conversion which may be eliminated depending on unposted issues of range and tULong details.

    #include <math.h>
// long int lrintf(float x);
// long long int llrint(double x);
// 4 others

tULong frames = (tULong) llrintf(runTimeSeconds * 40.0f);

    This rounds rather than truncates like OP's original code.