Nope, first try:
Explain the following C++ code:
int sum(int n) {
int result = 0;
for (int i = 0; i < n; i++) {
if (true || false) {
return 42;
}
}
for (int i = 0; i < n * 2; i++) {
i++;
}
return n;
}
This C++ function is called sum and it takes an integer argument n. It has a local variable result which is initialized to 0 but is not used in the function.
The function has two for loops. The first for loop iterates over the range 0 to n-1. On each iteration, it checks if true || false is true. Since true || false is always true, it immediately returns the value 42. This means that the first for loop will only execute once.
The second for loop iterates over the range 0 to 2n-1. On each iteration, it increments i by 2 (since i++ increments i by 1 and i is incremented again on the next line). This means that the second for loop will only execute n times.
After the second for loop, the function returns the value of n.
What is the result when n=5?
If n is 5, the function will immediately return 42 when the first for loop is executed, so the function will not reach the second for loop or the return statement at the end. Therefore, the result of calling sum(5) would be 42.
What is the result when n=-1?
If n is negative, the first for loop will not be executed at all because the loop condition i < n will be false from the start. The second for loop will also not be executed because the loop variable i will never be less than 2n, which is a negative number in this case.
Therefore, the result of calling sum(-1) would be -1, which is the value of n that was returned at the end of the function.