C语言实现机械优化设计，六种一维方法。黄金分割法、平分法、三点二次插值法、三点三次插值法、割线法、抛物线法。-C-mechanical optimization design, the six one-dimensional approach. Golden section method, split method, 3.2 times interpolation method, 3.3 times interpolation method, secant method, the parabol