View Compilation Error

0_0_23732359_5610.cpp: In function 'int main()':
0_0_23732359_5610.cpp:9:43: error: 'v' was not declared in this scope
     while (scanf("%lf%lf", x, y) != EOF) {v
                                           ^
0_0_23732359_5610.cpp:10:31: error: expected ';' before ')' token
         for (i = 1; i < 4; i++)
                               ^