/in/foo.cc: In function 'int main()':
/in/foo.cc:32:18: error: 'm' was not declared in this scope
     printf("%d", m);
                  ^
/in/foo.cc:12:21: warning: unused variable 'b' [-Wunused-variable]
     int i, j, k, n, b,num = 0;
                     ^