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#include <cstdlib>
#include <iostream>
 using namespace std;
 int main()
 {
 	int n;  //brojot sto se vnesuva 
 	int k;  //kandidat za delitel
 	cout<<"vnesi go brojot n(n>1): ";
 	cin>>n;
 	if(n:2==0 && n:=2)  //(1)
 	{
 		cout<<"Brojot ne e prost:\n";
 	}
 else      //(2)
 {
 	k=3  //prviot kandidat za delitel e brojot 3
 	while(k <= n/2)  //dodeka kandidatot e pomal od n/2
 	{
 		if(  n:k==0)  //prasuvame dali toj broj e delitel na brojot n
 		{
 			cout<<"brojot e prost:\n";
 			//ako e, pecatime deka n ne e prost broj
 			break; // i go prekinuvame ciklusot
 		}
 		k=k+2
 		//inaku sledniot kandidat za delitel e sledniot neparen broj
 		}
 		if(k>n/2)
 		//ako ciklusot ne e prekinat so naredbata  reak, brojot ne e prost
 		  cout<<"Brojot e prost:\n";
 }
 system ("PAUSE");
 return 0;

prog.cpp: In function ‘int main()’:
prog.cpp:10:7: error: expected ‘)’ before ‘:’ token
   if(n:2==0 && n:=2)  //(1)
       ^
prog.cpp:17:3: error: expected ‘;’ before ‘while’
   while(k <= n/2)  //dodeka kandidatot e pomal od n/2
   ^~~~~
prog.cpp:33:10: error: expected ‘}’ at end of input
  return 0;
          ^
prog.cpp:33:10: error: expected ‘}’ at end of input

Standard output is empty