View Compilation Error

0_0_24877975_29618.cpp: In function 'int main()':
0_0_24877975_29618.cpp:4:26: error: 'n' was not declared in this scope
     while(~scanf("%d%d",&n,&m))
                          ^
0_0_24877975_29618.cpp:4:29: error: 'm' was not declared in this scope
     while(~scanf("%d%d",&n,&m))
                             ^