用子程序编写程序:从键盘输入一个二位十进制月份数显示出相应英文缩写...答:Public Class Form1 Dim mon() As String = {"您的输入存在问题", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"} Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click...
编写程序,从键盘输入三角形的三边,调用三角形面积函数求出其面积,并...答:(4)S△=c^2sinAsinB/2sin(A+B)(5)S正△= [(√3)/4]a^2 (正三角形面积公式,a是三角形的边长) [海伦公式(3)特殊情况]include<stdio.h> include<math.h> int main(){ double a, b, c, p, s;printf("请输入三角形的三边长:");scanf("%lf%lf%lf", &a, &b, &c);p ...