View Compilation Error

0_0_19237044_15802.cpp: In function 'int main()':
0_0_19237044_15802.cpp:5:23: error: 'x' was not declared in this scope
  while(~scanf("%d%d",&x,&y))
                       ^
0_0_19237044_15802.cpp:5:26: error: 'y' was not declared in this scope
  while(~scanf("%d%d",&x,&y))
                          ^
0_0_19237044_15802.cpp:6:17: error: 'a' was not declared in this scope
   printf("%d\n",a+b);
                 ^
0_0_19237044_15802.cpp:6:19: error: 'b' was not declared in this scope
   printf("%d\n",a+b);
                   ^