View Compilation Error

0_0_20766710_15850.cpp: In function 'int main()':
0_0_20766710_15850.cpp:8:23: error: 'n' was not declared in this scope
  while(scanf("%d %d",&n,&m) != EOF)
                       ^
0_0_20766710_15850.cpp:8:26: error: 'm' was not declared in this scope
  while(scanf("%d %d",&n,&m) != EOF)
                          ^