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#include <iostream>
#include  <stdlib.h>
#include   <ctime>
using namespace std;
 
int main() {
 
	cin>>n
	int a[n]
 {
  for ( int i = 0; i < n; i ++)
    a [i] = rand ()%100; 
 }
	k=a[0]
	  for (int i = 1; i < n; i ++ )
	  {
	  	if (a[i]%2=0)
	  	{
	  		a[i]=a[i]+k;
	  	}
	  }
	 cout<<a
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:7: error: ‘n’ was not declared in this scope
  cin>>n
       ^
prog.cpp:14:2: error: ‘k’ was not declared in this scope
  k=a[0]
  ^
prog.cpp:14:4: error: ‘a’ was not declared in this scope
  k=a[0]
    ^
prog.cpp:15:20: error: ‘i’ was not declared in this scope
    for (int i = 1; i < n; i ++ )
                    ^

Standard output is empty