View Compilation Error

0_0_30723195_20388.cpp: In function 'int main()':
0_0_30723195_20388.cpp:5:4: error: 'doubie' was not declared in this scope
    doubie x1,x2,y1,y2;
    ^
0_0_30723195_20388.cpp:6:31: error: '$x1' was not declared in this scope
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                               ^
0_0_30723195_20388.cpp:6:35: error: '$x2' was not declared in this scope
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                                   ^
0_0_30723195_20388.cpp:6:39: error: '$y1' was not declared in this scope
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                                       ^
0_0_30723195_20388.cpp:6:43: error: '$y2' was not declared in this scope
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                                           ^
0_0_30723195_20388.cpp:6:47: error: expected ')' before '!' token
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                                               ^
0_0_30723195_20388.cpp:6:51: error: expected ';' before ')' token
    while(scanf("%lf%lf%lf%lf",$x1,$x2,$y1,$y2)!EOF)
                                                   ^