输入三角形的三个边，判断是否为等边三角形

<pre name="code" class="java">/*
** Classify the type of a triangle given the lengths of its sides.
*/
#include <stdlib.h>
#include <stdio.h>
int
main()
{
float
float
float
float
a;
b;
c;
temp;
/*
** Prompt for and read the data.
*/
printf( "Enter the lengths of the three sides of the triangle: " );
scanf( "%f %f %f", &a, &b, &c );
/*
** Rearrange the values so that a is the longest and c is the shortest.
*/
if( a < b ){
temp = a;
a = b;
b = temp;
}
if( a < c ){
temp = a;
a = c;
c = temp;
}
if( b < c ){
temp = b;
b = c;
c = temp;
}
/*
** Now see what kind of triangle it is. Note that if any of the sides
** is <= 0 (and we really only have to check the shortest one for this),
** or if the two shorter sides together are shorter than the longest
** side, it isn’t a triangle at all.
*/
if( c <= 0 || b + c < a )
printf( "Not a triangle.\n" );
else if( a == b && b == c )
printf( "Equilateral.\n" );