View Compilation Error

0_0_29408884_24009.cpp:26:5: error: expected initializer before 'int'
     int n;
     ^
0_0_29408884_24009.cpp:29:5: error: expected unqualified-id before 'while'
     while (scanf("%d%lf%lf%lf", &n, &p, &a, &b))
     ^