0_0_31867677_26113.c: In function 'main': 0_0_31867677_26113.c:6:45: error: expected ')' before '{' token while(scanf("%lf%lf%lf%lf",&x,&y,&a,&b!=EOF){ ^ 0_0_31867677_26113.c:10:1: error: expected expression before '}' token } ^