Arithmetic, Relational & Logical Operators
Integer division truncation and Short-Circuit evaluation
Operators perform computations on operands. Understanding truncation and short-circuit evaluation is essential:
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Integer Division Truncates Towards Zero
In C, 5 / 2 evaluates to 2 (the fractional part .5 is discarded). To get a floating-point result, at least one operand must be a float or explicitly cast: 5.0 / 2 == 2.5 or (double)5 / 2 == 2.5.
short_circuit.c
int a = 0; int b = 10; // Short-circuit evaluation: In (A && B), if A is false, B is NEVER evaluated! if (a != 0 && ++b > 10) { // Will not execute } printf("b is still: %d\\n", b); // Prints 10 (b was not incremented!)