Fix “Invalid Operands to Binary %” in C
This compiler error means `%` received a floating-point operand. Fix the underlying type choice with integer arithmetic or the appropriate `fmod` function—not a reflexive cast.
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C Programming Basics
C Modulo Operator: Check Divisibility and Remainders
A practical look at C’s % operator: when a zero remainder proves divisibility, what negative results mean, and which edge cases need a guard.