# include & ltstdio.h & gt
# include & ltmath.h & gt
int main()
{浮點a,b;
scanf("%f%f ",& amp壹,& ampb);
printf("%f\n ",(a+b+fabs(a-b))/2);
printf("%f\n ",sqrt((a+b+fabs(a-b))/2));
返回0;
}
/*浮點數的fabs(x)函數
整數的Abs(x)函數*/