View Compilation Error

0_0_16094219_21867.cpp: In function 'int main()':
0_0_16094219_21867.cpp:8:21: error: 'n' was not declared in this scope
       scanf("%d%d",&n,&m);
                     ^
0_0_16094219_21867.cpp:8:24: error: 'm' was not declared in this scope
       scanf("%d%d",&n,&m);
                        ^