View Compilation Error

0_0_15603742_14152.cpp: In function 'int main()':
0_0_15603742_14152.cpp:6:2: error: expected initializer before 'double'
  double x1,x2;
  ^
0_0_15603742_14152.cpp:7:24: error: 'n' was not declared in this scope
  while(scanf("%lf%lf",&n,&m),n+m)
                        ^
0_0_15603742_14152.cpp:9:3: error: 'x1' was not declared in this scope
   x1=(n-sqrt(n*n-4*m))/2;
   ^
0_0_15603742_14152.cpp:10:3: error: 'x2' was not declared in this scope
   x2=(n+sqrt(n*n-4*m))/2;
   ^