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【简答题】
根据输入的三角形的三条边x、y、z,计算并输出面积和周长。注意:在一个三角形中, 任意两边之和大于第三边。三角形面积计算公式:area=根号(s(s−x)(s−y)(s−z)),其中s=(x+y+z)/2。 输入格式: 输入为3个正整数,分别代表三角形的3条边a、b、c。 输出格式: 如果输入的构成一个三角形,则在一行内,按照 area = 面积; l = 周长 的格式输出,保留两位小数。 如果输入的边不能构成一个三角形,输出“error”
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