C language. Input three numbers to find out whether it can form a triangle, can, find out the area

C language. Input three numbers to find out whether it can form a triangle, can, find out the area

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In C language, input three numbers from the keyboard to form three sides of the triangle, how to find its area

The lengths of the three sides of the triangle are: A, B, C, when s = 1 / 2 (a + B + C),
The area of triangle is: area = under the root sign [S (S-A) (S-B) (S-C)]
Triangle judgment: the sum of any two sides is greater than the third side
main()
{ int errormark=0;
float a,b,c,s;
scanf("%f %f %f",&a,&b,&c);
switch (a>b && a>c)
{ case 1:if(b+ca && b>c)
{ case 1:if (a+c

Task description:
Input three sides a, B, C of triangle to judge whether they can form a triangle. If they can form a triangle, point out what kind of triangle they are. Note: judge whether floating-point numbers are equal, and if the absolute value of the difference is less than 10-3, they are considered equal. Five test cases are required
Input request: F% F% F
Output requirements:
(1) If it is isosceles triangle, output "iscsceles triangle!"
(2) If it is a right triangle, output "right angled triangle!"
(3) If it is isosceles right triangle, output "iscsceles right triangle!"
(4) If it is a general triangle, output "triangle!"
(5) If the triangle cannot be formed, output "error!"
What's wrong with my editing? Why can't I respond to every input?
#include
#include
#define LIMIT 1e-1
int main()
{
float a,b,c;
printf("");
scanf("%f,%f,%f",a,b,c);
if ((a+b)>c && (b+c)>a && (a+c)>b)
{
if ( fabs(a-b)
Build and run are OK, but the program can't respond after inputting the number

Scanf (%% F,% F ", a, B, c) is wrong. It should be scanf (%% F,% F", & A, & B, & C);

Write a program, input triangle three sides a, B, C, judge whether a, B, C can form triangle, if not, output corresponding information, if can calculate triangle area
Write a program, input triangle three sides a, B, C, judge whether a, B, C can form triangle, if not, output corresponding information, if can calculate triangle area. Attention is C language!

/*Time: 2010-4-8 Author: Ju * / #############include double check (double a, double B, double C) {double temp = 0; / * check the trilateral relationship and calculate the area * / if ((a + b) > C & (a + C)