OJ Final Brush question B: Finding the triangular area-gyy

Title Description

Enter the length of the three edges, if the three edges can form a triangle, you need to calculate the Triangle area, and if you cannot form a triangle, output the hint message "error input". Output area is output as two decimal places

Input

Length of three sides

Output

If these three edges can form a triangle, the area of the triangle is output, and if the three edges do not form a triangle, the output cue message "Error input"

Sample input

3.3  4.4  5.5

Sample output

area=7.26

Tips

Retain two decimal places when output area

Code:

#include <iostream> #include <cstdio> #include <cmath> #include <iomanip>using namespace std; int main () {    double a,b,c,l,s,m;    cin>>a>>b>>c;    L= (A+B+C)/2;    m=l* (l-a) * (l-b) * (l-c);    if (a+b>c&&a-b<c&&b-a<c)    {        s=sqrt (m);        cout<< "Area=" <<setiosflags (ios::fixed) <<setprecision (2) <<s;    }    else        cout<< "error  input";        return 0;}

Operation Result:

Learning experience:

Good study Day Day up



OJ Final Brush question B: Finding the triangular area-gyy