Find the Runtime Complexity of a given program

Problem-1

void DemoFunction(int n) {
		int i;
		int count = 0;
		for (i = 1; i * i < n; i++) {
			count++;
			System.out.println("*");
		}
	}

void DemoFunction(int n) {

int i;

int count = 0;

for (i = 1; i * i < n; i++) {

count++;

System.out.println("*");

}

Problem-2

void DemoFunction(int n) {
		int i = 1;
		int s = 1;
		while (s <= n) {
			i++;
			s = s + i;
			System.out.println("@");
		}
	}

void DemoFunction(int n) {

int i = 1;

int s = 1;

while (s <= n) {

i++;

s = s + i;

System.out.println("@");

}