Как-то так, наверное
Объяснение:
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double a, x, b, c, D;
cout<<"Введите a: "; cin >> a;
cout<<"Введите b: "; cin >> b;
cout<<"Введите c: "; cin >> c;
D = pow(b,2)-4*a*c;
if(D>0){
cout << "x1 = " << ((-1)*b+sqrt(D))/(2*a)<<endl;
cout << "x2 = " <<((-1)*b-sqrt(D))/(2*a)<<endl;
}
else if(D==0){
cout << "x = " << ((-1)*b)/(2*a)<<endl;
}
else{
D*=(-1);
cout<< "x1 = " << ((-1)*b)/(2*a) <<"+"<< (sqrt(D))/(2*a) << "*i" <<endl;
cout<< "x2 = " << ((-1)*b)/(2*a) <<"-"<< (sqrt(D))/(2*a) << "*i" <<endl;
}
return 0;
}
1)
var
a, b, s : real;
begin
read (a, b);
s := a * b;
write (s:10:4);
end.
2)
var
a, b, c, k : integer;
begin
read (a, b, c);
k := 0;
if a > 0 then inc (k);
if b > 0 then inc (k);
if c > 0 then inc (k);
writeln (k);
end.
3)
var
a : integer;
begin
read (a);
writeln ((a mod 10) * (a mod 100 div 10) * (a div 100 mod 10) * (a div 1000));
end.
4)
var
c, n : integer;
begin
read (n);
c := 0;
repeat
inc (c);
n := n div 10;
until n = 0;
writeln (c);
end.
5)
var
n, sum, i : integer;
begin
read (n);
sum := 0;
for i := 1 to n do
sum := sum + i;
writeln (sum);
end.
6)
var
d, n, k : integer;
begin
read (n, k);
d := 0;
while n >= k do
begin
d := d + 1;
n := n - k;
end;
writeln ('n div k = ', d);
writeln ('n mod k = ', n);
end.
7)
var
n, sum, i, tmp : integer;
begin
read (n);
sum := 0;
for i := 1 to n do
begin
read (tmp);
sum := sum + tmp;
end;
writeln (sum / n);
end.
8)
var
i, n, s : integer;
a : array [1..1000] of integer;
begin
s := 2;
read (n);
for i := 1 to n do
begin
a[i] := s;
s := s + 2 * i + 1;
end;
for i := 1 to n do write (a[i], ' ');
end.
9)
var
n, i, count, tmp : integer;
begin
read (n);
count := 0;
for i := 1 to n do
begin
read (tmp);
if tmp < 0 then inc (count);
end;
writeln (count);
end.
10)
var
n, i, j : integer;
begin
read (n);
for i := 1 to n do
begin
for j := 1 to i do
write ('*');
writeln;
end;
end.
11) //Не понял, как заполняется массив? Тут рандом
var
a : array [1..1000] of integer;
i, n : integer;
begin
read (n);
for i := 1 to n do
a[i] := trunc (random (1000)) - 500;
for i := 1 to n do
if a[i] > 0 then a[i] := a[i] * (-1)
else if a[i] < 0 then a[i] := sqr (a[i]);
for i := 1 to n do
write (a[i], ' ');
end.
12)
var
n, i, count : integer;
begin
read (n);
count := 0;
for i := 1 to n do
if n mod i = 0 then inc (count);
writeln (count);
end.
