Wuhan University of Science and Technology acm:1004: Chinese Edition C language Programming tutorial (second Edition) Exercise 5.6

Problem Description

This day the teacher again to small Hao out a topic: give you three lengths, respectively, A,b,c match, let you calculate the three matches can make up of the Triangle area.

Input

Enter each row to include three number a,b,c.

Output

The area of the output triangle for each row (reserved three decimal places), cannot be composed of triangles told the small Hao output "no!".

Sample Input

1 2 33) 4 5

Sample Output

no!6.000

HINT

1#include <stdio.h>2#include <math.h>3 intMain ()4 {5     Doubles,a,b,c,p;6      while(SCANF ("%LF%LF%LF", &a,&b,&c)! =EOF)7     {8         if(a+b>c&&a+c>b&&c+b>a)9         {Tenp= (A+B+C)/2; Onep=p* (P-A) * (p-b) * (P-c); As=sqrt (p); -printf"%.3lf\n", s); -         } the         Elseprintf"no!\n"); -          -     } -      +     return 0; -}

Wuhan University of Science and Technology acm:1004: Chinese Edition C language Programming tutorial (second Edition) Exercise 5.6