View Compilation Error

0_0_33129639_15221.cpp: In function 'int main()':
0_0_33129639_15221.cpp:8:29: error: 'a' was not declared in this scope
     while(cin >> n >> m && (a||b)){
                             ^
0_0_33129639_15221.cpp:8:32: error: 'b' was not declared in this scope
     while(cin >> n >> m && (a||b)){
                                ^