.


:




:

































 

 

 

 


2. for

3

++

for , , .

: 1

:

for (i = 1;i <= 10;i++)

cout<<i<<"

, . , , . , for , while.

1. 10 20.

for(i=10;i<=20;i++)

cout << i << " ";

:

10 11 12 13 14 15 16 17 18 19 20

1. for , n1 n2, n1 n2 - , .

2. , n 1 . , 5 5 4 3 2 1. (: , for, i n, i >= 1 1 i .)

 

2. for

, . (, , .)

 

:

i 2.

i n,

n i,

n .

1 i.

 

( for) 2 n,

n i,

n .

 

#include <iostream>

#include <math.h>

using namespace std;

 

int main() {

int n; //

int i; //

int is_prime; // ,

 

is_prime = true;

 

//

cout << "Enter a number and press ENTER: ";

cin >> n;

 

//

for (i = 2; i <= sqrt((double) n); i++) {

if (n % i == 0)

is_prime = false;

}

//

if (is_prime)

cout << "Number is prime.";

else

cout << "Number is not prime.";

return 0;

}

 

: sqrt((double) n) n.

3. , . , , , , , , .

, :

✓ n , square_root_of_n for. , double.

✓ n, . , if break ( ) is_prime false.

4.

a)

b)

x ( x double).



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