大地问题解算中采用了椭球面的贝塞尔解算，使用了VS2010编写-Problem solver in the earth using the Bessel ellipsoid solver

编写程序，根据输入的3条边长值计算三角形面积。如果输入值不符合“任意两边之和大于第三边”，则给出错误提示。-Write a program to calculate the area of ​ ​ a triangle based on three values ​ ​ of the input side. If the input value does not meet the " arbitrary sides is greater than