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若运行以下程序时输入：2 4 1<回车>,则程序的运行结果是。#include #include int main ( ){double a,b,c,disc,x1,x2,p,q;scanf("%lf%lf%lf",&a,&b,&c);disc=bb-4a*c;if (disc<0)printf("This equation hav't real roots\n");else{ p=-b/(2.0a);q=sqrt(disc)/(2.0a);x1=p+q;x2=p-q;printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);}return 0;}

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