View Compilation Error

0_0_26302789_8011.cpp: In function 'int main()':
0_0_26302789_8011.cpp:14:34: error: 'k' was not declared in this scope
              for(int j=2;j<=sqrt(k)&&flag;j++)                 if(k%j==0)flag=         }
                                  ^
0_0_26302789_8011.cpp:14:88: error: expected primary-expression before '}' token
              for(int j=2;j<=sqrt(k)&&flag;j++)                 if(k%j==0)flag=         }
                                                                                        ^
0_0_26302789_8011.cpp:15:4: error: 'flag' was not declared in this scope
 if(flag)printf("OK\n");
    ^
0_0_26302789_8011.cpp:16:43: error: expected ';' before 'return'
         else printf("Sorry\n");     1     return 0;
                                           ^
0_0_26302789_8011.cpp:16:51: error: expected '}' at end of input
         else printf("Sorry\n");     1     return 0;
                                                   ^