Q.Predict the output of the following code and explain why:

int a = 17, b = 5;  
System.out.println(a / b);  
System.out.println(a % b);  
System.out.println((double) a / b);  

The result turns on the difference between integer division and division with a decimal operand. …

Let us take each statement in turn, with a = 17 and b = 5.

a / b → 3. When both operands are integers, Java performs integer division and discards the fractional part. 17 ÷ 5 is 3.4, but the .4 is dropped, leaving 3.

a % b → 2. The modulus operator % returns the remainder of the division. 17 = 5 × 3 + 2, so the remainder is 2. …

You can force decimal division without a cast by making a literal a decimal, e.g. …

Expecting a / b to give 3.4 — it does not, because both operands are int. Forgetting that % needs the remainder, not the quotient. Writing (double)(a / b), which computes the inte …