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Outside the while loop, we have initialized int i = 0;. If you omit the increment statement, you will end up with an infinite loop because i will always remain as 0 (unless you increment it).
When making a square number system, why doesn’t it work when I key in this statement" square = square * square" because it doesn’t give the correct answer.
Consider what’s happening to square in each loop with your current code.
Loop 1: square is 0, so 0 * 0 = 0. All good there. square is incremented by 1 with square++;
Loop 2: square is 1, so 1 * 1 = 1. square is incremented by 1 with square++;
Loop 3: square is 2, so 2 * 2 = 4. square is incremented by 1 with square++;
Now things start going crazy. square is 5 after being incremented, so on the next loop… Loop 4: square is 5, so 5 * 5 = 25. square is incremented by 1 with square++;
and it just gets worse from there. After that, square starts with the value of 26.
#include
int main() {
int i = 0;
int square = 0;
// Write a while loop here:
while (i < 10 && square == i){
std::cout << i << " " << i * square << “\n”;
i++;
square++;
}
return 0;
}
Where will you assign i = 0 in the while loop?
If you assign it like this: while (int i = 0) { ... that isn’t acceptable because the while loop condition is supposed to go in between the parentheses while (\\loop condition) { ...
If you do it inside the body of the while loop like:
while (i < 10) {
i = 0;
\\ do stuff here
i++;
}
that won’t work because in every iteration of the while loop, the statements in the loop body will be executed. That means every time through, i will be set to 0, then we will do some stuff, then we will increment i to 1. Then we will check the loop condition (i < 10) which will be true. We will go to the next iteration. In the next iteration, we will again set i to 0, do some stuff and so on. We will end up with an infinite loop. Additionally if i is not initialized before the first time we reach the while loop, then the compiler will throw an error because i will be undeclared and uninitialized and therefore the condition (i < 10) can’t be evaluated. So, we must declare and initialize the loop variable before entering our while loop.
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