View Compilation Error

0_0_23362714_16423.cpp: In function 'int main()':
0_0_23362714_16423.cpp:4:22: error: 'n' was not declared in this scope
  while(scanf("%d%d",&n,&m)!=EOF)
                      ^
0_0_23362714_16423.cpp:4:25: error: 'm' was not declared in this scope
  while(scanf("%d%d",&n,&m)!=EOF)
                         ^