View Compilation Error

0_0_16363554_10285.cpp: In function 'int main()':
0_0_16363554_10285.cpp:6:49: error: expected ')' before ';' token
    while(scanf("%lf %lf %lf %lf",&x1,&x2,&y1,&y2;)!=EOF)
                                                 ^
0_0_16363554_10285.cpp:6:49: error: expected ')' before ';' token
0_0_16363554_10285.cpp:6:50: error: expected primary-expression before ')' token
    while(scanf("%lf %lf %lf %lf",&x1,&x2,&y1,&y2;)!=EOF)
                                                  ^