2015
04-16

# Triangle

A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments.
Triangles can be classified according to the relative lengths of their sides:
・ In an equilateral triangle all sides have the same length. An equilateral triangle is also a regular polygon with all angles measuring 60°.
・ In an isosceles triangle, two sides are equal in length. An isosceles triangle also has two angles of the same measure; namely, the angles opposite to the two sides of the same length; this fact is the content of the Isosceles triangle theorem.
・ In a scalene triangle, all sides are unequal. The three angles are also all different in measure. Some (but not all) scalene triangles are also right triangles.

The first line of input contains an integer (1 <= T <= 100), the number of test cases. T test data sets follow, each data set consists of 3 integers A, B and C, where (1 <= A,B,C <= 1,000,000) the triangle side lengths.

The first line of input contains an integer (1 <= T <= 100), the number of test cases. T test data sets follow, each data set consists of 3 integers A, B and C, where (1 <= A,B,C <= 1,000,000) the triangle side lengths.

2
3 3 4
6 4 2

Case #1: isosceles
Case #2: invalid!

// 判断三角形是等边三角形，等腰三角形，普通三角形，和不能组成三角形
#include<iostream>
#include<string>
#include<string.h>
using namespace std;

int main()
{
int n, p=1;
scanf("%d", &n);
while(n--)
{
int a, b, c;
scanf("%d%d%d", &a, &b, &c);
if(a > b)
swap(a, b);
if(b > c)
swap(b, c);
if(a > b)
swap(a, b);
printf("Case #%d: ", p++);
if(a+b <= c)
printf("invalid!\n");
else if(a==b && b==c)
printf("equilateral\n");
else if(a==b || b==c)
printf("isosceles\n");
else
printf("scalene\n");

}
return 0;
}

1. bottes vernies blanches

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