pset2 Readability: reading index being calculated incorrectly even though hard sentence, word and letter numbers are correct

Question

The indexes come out sometimes too low,some times too high and I don't really understand why if the variable calculations come out right every time.

Here's my code for it:

//calculates average letters per 100 words
float L = (((float)letters * 100.0) / (float)words);

//calculates average sentences per 100 words
float S = (((float)sentences * 100.0) / (float)words);

// calculates the index
float index = (0.0588 * L) - (0.296 * S) - 15.8;
printf("%f\n",index);

Any help is greatly appreciated.

Answer 1

It looks like there's a step missing in the calculation. The final result is supposed to be rounded to the nearest integer. That would explain being just a little off in both directions.

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