Ответ:

Объяснение:

#include <iostream>

using namespace std;

void cycle_for() {

int sum = 0;

for (int i = 0; i <= 80; i++) if (i % 4 == 0) sum += i;

cout << "Cycle for: " << sum << endl;

}

void cycle_while() {

int i = 0, sum = 0;

while (i <= 80) {

 if (i % 4 == 0) sum += i;

 i++;

}

cout << "Cycle while: " << sum << endl;

}

void cycle_do_while() {

int i = 0, sum = 0;

do {

 if (i % 4 == 0) sum += i;

 i++;

} while (i <= 81);

cout << "Cycle do while: " << sum;

}

int main() {

cycle_for();

cycle_while();

cycle_do_while();

}