算法笔记codeup-Contest100000566

ABCD太直接了就不放了

E 求一元二次方根   C语言

 #include <stdio.h>
 #include <math.h>
 int main()
 {
 double a=;
 double b=;
 double c=;
 scanf("%lf%lf%lf",&a,&b,&c);
 double r1=(-b+sqrt(b*b-*a*c))/(*a);
 double r2=(-b-sqrt(b*b-*a*c))/(*a);
 printf("r1=%7.2f\n",r1);
 printf("r2=%7.2f",r2);
 return ;
 }

F 字符输入输出  C++

 #include <iostream>
 #include <string>
 using namespace std;
 int main()
 {
     string boy;
     cin>>boy;
     cout<<boy;

 }