Question

int i = 3, j = 3;
for (; i++ == j--; i += 2, j -= 2) {
    do {
        i = i + j;
    } while (i % j != 0);
}
System.out.println(i);
System.out.println(j);

I tried debugging it in Eclipse, and here’s the result:

• i,j
• 3,3
• 4,2
• 6,2
• 9,-1

Since the last time for loop checked the values of i and j, they were not equal to each other, why did it came out of the loop? Wouldn’t it be an infinite loop?

Answer 1

for (; ++i != --j; i += 2, j -= 2) {}

Condition ++i != --j or i++ != --j or ++i != j-- will cause infinite loop.

i++ and j– both are post increment and decrements respectively so first it will check the condition and later increment the value.