View Compilation Error

0_0_37822786_21927.cpp: In function 'void solve()':
0_0_37822786_21927.cpp:43:18: error: '$x' was not declared in this scope
 scanf("%lf %lf", $x, $y);
                  ^
0_0_37822786_21927.cpp:43:22: error: '$y' was not declared in this scope
 scanf("%lf %lf", $x, $y);
                      ^
0_0_37822786_21927.cpp:48:18: error: '$x' was not declared in this scope
 scanf("%lf %lf", $x, $y);
                  ^
0_0_37822786_21927.cpp:48:22: error: '$y' was not declared in this scope
 scanf("%lf %lf", $x, $y);
                      ^