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Hunan Normal University
College of Information Science and Engineering
三角形的面积
Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:32768KB
Total submit users: 83, Accepted users: 64
Problem 11291 : No special judgement
Problem description
  读入三角形三边的边长a,b,c,输出它的面积。

Input
  有多组测试数据。输入的第一行是整数T(0
Output
  对应每组输入,输出一行该三角形的面积,保留两位小数。如果三条边不能构成三角形,请输出“can't construct a triangle!”。该行不能有其它多余的符号。输出格式具体见样例。

Sample Input
3
3 4 5
3 4 7
3 4 8
Sample Output
S(3,4,5)=6.00
S(3,4,7)=0.00
(3,4,8) can't construct a triangle!
Judge Tips
  可以使用公式:S=sqrt(p(p-a)(p-b)(p-c)),其中p=(a+b+c)/2。
输出固定位数小数点
C++

#include<iostream>
#include<iomanip>
using namespace std;

int main()
{
double t=3.123456;
cout <<setiosflags(ios::fixed);
cout<<setprecision(2)<<t<<endl;


return 0;
}

C

#include<stdio.h>

int main()
{
double t=3.123456;
printf("%.2lf",t);

return 0;
}


Problem Source
  UESTC

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