View Compilation Error

0_0_32124815_21399.cpp: In function 'int main()':
0_0_32124815_21399.cpp:9:25: error: 'n' was not declared in this scope
     while(scanf("%d%d",&n,&m)!=EOF)
                         ^
0_0_32124815_21399.cpp:9:28: error: 'm' was not declared in this scope
     while(scanf("%d%d",&n,&m)!=EOF)
                            ^