#include <iostream>
int main(){
int a = 0;
int b = 0;
char operation;
std::cout << "Enter first number: ";
std::cin >> a;
std::cout << "Enter second number: ";
std::cin >> b;
std::cout << "Enter operation: ";
std::cin >> operation;
switch (operation){
case '-':
std::cout << "a - b = " << a - b <<'\n';
break;
case '+':
std::cout << "a + b = " << a + b << '\n';
break;
case '*':
std::cout << "a * b = " << a * b << '\n';
break;
case '/':
std::cout << "a / b = " << a / b << '\n';
break;
default:
std::cout << "Error\n";
}
return 0;
}
Объяснение: Это на C++
1)
program gt1;
var x,y:real;
begin
x:=-3.1;
while x<1 do
begin
x:=x+0.1;
y:=4*x*x*x-2*x*x+5;
writeln(y);
end;
end.
2)
program gt2;
var k,i:integer;
begin
k:=0;
for i:=11 to 20 do
begin
if(i mod 2=1)then k:=k+1;
end;
writeln(k);
end.
3)
program gt3;
var s,i:integer;
begin
s:=0;
for i:=1 to 100 do
begin
if(i mod 2=0)then s:=s+i;
end;
writeln(s);
end.
4)
program gt4;
var sum,a:real;
i,n:integer;
begin
sum:=0;
a:=0;
readln(n);
for i:=1 to n do begin
a:=1/((3*n-2)-(3*n+1));
Sum:=sum + a;
n:=n+1;
end;
write(sum);
end.
5)
program gt5;
var n,k:integer;
begin
k:=0;
while n>0 do
begin
n:=n div 10;
k:=k+1;
end;
writeln(k);
end.
