UVa 11455 - Behold my quadrangle

题目：判断给定的四个边能构成的图形。

分析：简单题。利用定义判断即可。正方形：四边相等；矩形：两组对边相等；非四边形：三边和小于第四边长。

#include <stdio.h>#include <stdlib.h>#include <string.h> int main(){int n,a,b,c,d; while ( scanf("%d",&n) != EOF )while ( n -- ) {scanf("%d%d%d%d",&a,&b,&c,&d);if ( a == b && b == c && c == d )printf("square\n");else if ( a == b && c == d || a == c && b == d ||a == d && b == c )printf("rectangle\n");else if ( a+b+c <= d || a+b+d <= c || a+c+d <= b || b+c+d <= a )printf("banana\n");else printf("quadrangle\n");}return 0;}