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The fractional part of a float can be obtained efficiently in C through floating point modulus by subtracting the integer part of the float from the float itself, using the floating point modulus operator (%).

Here is an example code snippet:

float num = 3.14159;
float fractional_part = num - (int)num;

In this example, (int)num will give us the integer part of the float num. We can then subtract this integer part from num to get the fractional part, which is stored in the variable fractional_part.

Alternatively, we can also use the floating point modulus operator to achieve the same result:

float num = 3.14159;
float fractional_part = num - ((int)num % 1.0);

In this case, (int)num % 1.0 will give us the integer part of num as a floating point value. We can then subtract this value from num to get the fractional part, which is again stored in the variable fractional_part.

Both of these methods are efficient and will give us the fractional part of a float in C using floating point modulus.