View Compilation Error

0_0_16687047_5594.c: In function 'main':
0_0_16687047_5594.c:5:22: error: 'm' undeclared (first use in this function)
  while(scanf("%d%d",&m,&n)!=EOF)
                      ^
0_0_16687047_5594.c:5:22: note: each undeclared identifier is reported only once for each function it appears in
0_0_16687047_5594.c:5:25: error: 'n' undeclared (first use in this function)
  while(scanf("%d%d",&m,&n)!=EOF)
                         ^
0_0_16687047_5594.c:24:2: error: expected declaration or statement at end of input
  } 
  ^