Do NOT check floats for equality

Don't check floats for equality; check for greater than or less than (EqualityFloatLeft.rule)


Description:
This rule checks whether you check floats for equality instead of checking for greater than or less than.

Benefits:

If you check floats for equality, you make your code more susceptible to rounding errors.

Example:

void func(float a, int b)
{
   if (a==b) { }     // Violation

   while (a!=b) { }  // Violation
}



Repair:

void func(float a, int b)
{
   if (a>=b) { }     // OK

   while (a<=b) { }  // OK
}

Author
ParaSoft


My comment for repairing:

void func(const float a, const int b)
{
    if ( a > b ) { }
    else if ( a < b ) {}
    else {}
    // while (a > b) { };
    // while (a < b) { };
}

Ref: http://www.c-faq.com/fp/fpequal.html
Tags: vav.vn, vav, float, float equality, check float values equality, floating point, absolute, epsilon

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