View Compilation Error

0_0_35967479_24472.cpp: In function 'int main()':
0_0_35967479_24472.cpp:4:13: error: 'n' was not declared in this scope
  while(cin>>n>>m&&n!=0&&m!=0){
             ^
0_0_35967479_24472.cpp:4:16: error: 'm' was not declared in this scope
  while(cin>>n>>m&&n!=0&&m!=0){
                ^